CN108981915A - High field Terahertz spin transmitter and spectrometer - Google Patents
High field Terahertz spin transmitter and spectrometer Download PDFInfo
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- CN108981915A CN108981915A CN201810570581.0A CN201810570581A CN108981915A CN 108981915 A CN108981915 A CN 108981915A CN 201810570581 A CN201810570581 A CN 201810570581A CN 108981915 A CN108981915 A CN 108981915A
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/10—Arrangements of light sources specially adapted for spectrometry or colorimetry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
- G01J3/0208—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using focussing or collimating elements, e.g. lenses or mirrors; performing aberration correction
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
Abstract
The embodiment of the invention provides a kind of high field Terahertz spin transmitter and spectrometer, high field Terahertz spin transmitter includes: the ferromagnetic nano thin-film, the first magnet and the second magnet of pre-set dimension；First magnet and the second magnet are both secured in plane locating for ferromagnetic nano thin-film, and first magnet and the second magnet setting point-blank, first pole of the first magnet and the second pole of the second magnet are oppositely arranged, the polarity of first pole and the second pole is on the contrary, ferromagnetic nano thin-film is arranged between the first pole and the second pole；Predetermined pulse width, the pumping laser that single pulse energy is preset energy penetrate ferromagnetic nano thin-film, generate the terahertz pulse radiation of default spectrum width, default radiation field intensity.There is provided in the embodiment of the present invention high field Terahertz spin transmitter, it can be achieved that ultra wide band, high field terahertz pulse radiation generation, and can avoid in the prior art generate high field terahertz pulse radiation when defect.
Description
Technical field
The present embodiments relate to terahertz pulse generation technology fields, spin and send out more particularly, to high field Terahertz
Emitter and spectrometer.
Background technique
For terahertz emission on electromagnetic spectrum between far infrared and millimeter wave, the specific position of the frequency range imparts this
The special property of frequency range, such as Terahertz frequency correspond to the vibration level and rotational energy level of large biological molecule, corresponding hydrone
The energy of hydrogen bond energy and Van der Waals for, many biomolecule all have Fingerprint in this frequency range, can be applicable to object
Matter identifies and identification；Terahertz frequency range means bigger information capacity, provides better communication for communication remote sensing, aerospace
Means.Terahertz emission all has broad application prospect in every field such as physics, chemistry, material, biology, medicine.
Currently, the various terahertz emission sources based on optics and electronics are come into being, produce various based on electricity
Low frequency and narrow bandwidth terahertz emission source and high-frequency wideband terahertz emission source.With the development of ultrafast laser technique, swashed based on femtosecond
The terahertz emission source of light technology can obtain more miniaturization, the lower terahertz emission of more reliable, more stable and cost
Source can meet the needs of experimental study and certain applications, and therefore, the THz source based on ultrafast laser technique obtains quickly
Development.
But Terahertz Technology does not obtain a large amount of practical application, hinders the development of Terahertz science and technology and application
Key is still high efficiency, low cost, the terahertz emission source of high stability, highly sensitive terahertz detector, and
The shortage of various Terahertz function elements.Wherein, low cost, high efficiency, miniaturization, ultra wide band, reliable and stable Terahertz spoke
The shortage for penetrating source becomes most important challenge.Terahertz emission source is the key that Terahertz science and technology develops composition portion
Point.With the development of ultrafast femtosecond laser technology, more structurally sound approach is provided to prepare terahertz emission source.
Arrangement of the terahertz emission source obtained currently based on ultrafast femtosecond laser technology according to frequency from low to high, can lead
Be divided into: (1) the optical rectification method based on lithium niobate inclination wave front technology, overlayable frequency range are 0.1-2.0THz,
Centre frequency is near 0.5THz；(2) the optical rectification method based on organic crystal, overlayable frequency range are 0.5-
5THz, centre frequency is in 2THz or so；(3) method based on double-colored plasma, overlayable frequency range are 1-10THz,
Centre frequency is near 3THz；(4) the transition radiation mechanism based on light laser and matter interaction, overlayable frequency range
For 0.3-30THz, the relatively low frequency of centre frequency；(5) large-aperture photoconductive antenna based on surface plasma enhancing, it is overlayable
Frequency range is 0.3-4THz, and centre frequency is near 1THz；(6) based on the beat effect of nonlinear crystal, centre frequency can
In 15-30THz, narrow-band tunable.
There is respective defect in above 6 kinds of high field terahertz emissions source.(1) optics based on lithium niobate inclination wave front technology
Method for rectifying is the common method that current laboratory obtains high energy high field terahertz emission, this is because the optical rectification method pair
The wavelength of pumping laser does not have particular requirement, and lithium columbate crystal can obtain high damage threshold by doping, can be used
Various high-energy lasers are to construct terahertz emission source.But inclination wave front technology is not only to the precise requirements of phase matched
Height, optical path build complexity, and since lithium columbate crystal has strong absorption to terahertz emission, so that the high frequency terahertz generated
It hereby radiates and is largely absorbed and cannot be coupled out to realize effective utilization, therefore the terahertz emission generated is generally relatively low
Frequently.Technical application is after on the high energy pumping femto-second laser for be greater than 100 millijoule magnitudes before by lithium niobate inclined wave, to crystal
Size require it is bigger, cause current crystal technique to be unable to satisfy the requirement of large-size crystals, lead to the technical application
Greatly difficult and challenge is encountered on the laser of higher energy.(2) the optical rectification method based on organic crystal is although can
To generate the high energy terahertz emission close to erg-ten, and the higher frequency of centre frequency, the coverage area of frequency by pumping laser arteries and veins
Rush width decision.Such maximum challenge of organic crystal is that the size of crystal can not grow bigger, and damage threshold is very
Low, price is extremely expensive, and is easy to deliquesce, highly unstable.Such terahertz emission source is in low energy Terahertz equipment
It even has difficulties, it is even more impossible to be exported on pumping laser with obtaining reliable and stable high field Terahertz.And due to crystal
It is easy the destruction of dampness, stimulated light, needs irregular replacement crystal, not only increases equipment cost, and give test data
Bring uncertainty.(3) based on the terahertz emission source of double-colored plasma, although can produce the ultra wide band of frequency spectrum 1-10THz
Terahertz emission and damage threshold is not present, but spectrum width is determined by the pulse width of pumping laser, and the terahertz of formation
Hereby radiation source is unstable, low efficiency, and the Terahertz system signal noise ratio built by terahertz emission source is not high, and being difficult to obtain stabilization can
The test data leaned on.Moreover, emission effciency is limited to the screen effect of charge in the terahertz emission source of high energy high field,
So that radiation efficiency is difficult to improve.And up to the present, those skilled in the art do not know based on double-colored plasma still
The emission mechanism in terahertz emission source.(4) high energy based on the acquisition of the transition radiation mechanism of light laser and matter interaction is strong
Although terahertz emission source can covering ultra wideband frequency range 0.3-30THz, for generating the pumping of terahertz emission
The repetition rate of laser is very low, cause such terahertz emission source apply it is extremely difficult in subsequent applications, such as
It is difficult to carry out the dynamic (dynamical) experimental study of Superfast time resolution, extreme Terahertz science and technology cannot be performed well in, so that
Such terahertz emission source is at present still in laboratory development phase.(5) macropore based on surface plasma enhancing
The terahertz emission source that diameter photoconducting antenna is formed can reach peak value electric field close to 1MV/cm after focusing, have high field completely
Requirement of the terahertz emission source to peak electric field.But the disadvantage of such radiation source maximum is that structure is complicated, electric field is easy
Puncture and device is caused to be easy to be destroyed, and such terahertz emission source is easy to be saturated, and leads to higher pumping energy
Amount is also difficult load on transmitting antenna, so that further increasing radiated electric field encounters great obstruction.(6) it is based on non-linear crystalline substance
Near 15-30THz, narrowband can coordinate the centre frequency coverage area in the high frequency terahertz emission source that the beat effect of body obtains
Peak value electric field can reach the extremely strong terahertz emission of 100MV/cm.However, the frequency in such terahertz emission source is generally inclined
Height is difficult to be generalized to 15THz or less.But 15THz frequency range below is considered as terahertz most suitably used inside condensed state system
Hereby frequency range, because the phonon vibration frequency of many condensed state systems falls in this frequency range just, and by way of optical difference frequency
It is difficult to be generalized to this most useful frequency range.
Summary of the invention
In order to overcome the problems referred above or it at least is partially solved the above problem, the embodiment of the invention provides one kind.
On the one hand, the embodiment of the invention provides a kind of high field Terahertz spin transmitter, comprising: pre-set dimension it is ferromagnetic
Nano thin-film, the first magnet and the second magnet；
First magnet and second magnet are both secured in plane locating for the ferromagnetic nano thin-film, and described
First magnet and second magnet setting point-blank, the of the first pole of first magnet and second magnet
Two poles are oppositely arranged, and the polarity of first pole and second pole is on the contrary, the ferromagnetic nano thin-film is arranged described first
Between pole and second pole；
Predetermined pulse width, the pumping laser that single pulse energy is preset energy penetrate the ferromagnetic nano thin-film, generate
The terahertz pulse radiation of default spectrum width, default radiation field intensity.
Preferably, the predetermined pulse width is the pulse width less than 100fs, and the preset energy is greater than mJ magnitude
Energy；
Correspondingly, the default spectrum width is the spectrum width greater than 4THz, and the default radiation field intensity is electric field
Peak strength is greater than 1MV/cm, peak magnetic field intensity is greater than 0.3Tesla.
Preferably, further includes: electro-conductive glass；
The electro-conductive glass is arranged on the output light path after the pumping laser penetrates the ferromagnetic nano thin-film, described
Electro-conductive glass is for transmiting the pumping laser and reflecting the terahertz pulse radiation.
It preferably, further include first support, second support and third bracket；
The first support, the second support are identical with the third support height, and first magnet passes through solid
Hot melt adhesive is fixed in the first support, and second magnet is fixed in the second support by solid thermal melten gel, institute
Ferromagnetic nano thin-film is stated to be arranged on the third bracket.
Preferably, the pumping laser is generated by femto-second laser.
On the other hand, the embodiment of the invention also provides a kind of spectrometers, spin including high field Terahertz described above
Transmitter, beam splitter, at least three reflecting mirrors, at least three paraboloidal mirrors, GaP crystal, quarter-wave plate, Walla this
Pause prism, equilibrium energy detector and oscillograph；
It include the first reflecting mirror and the second reflecting mirror, first reflecting mirror and described at least three reflecting mirror
Two-mirror is arranged in optical delay line device；It include default paraboloidal mirror at least three paraboloidal mirror, it is described
Light hole is provided on default paraboloidal mirror；The default paraboloidal mirror is arranged at least three reflecting mirror and the phosphatization
In optical path between gallium crystal；
The beam splitter is arranged in the optical path before the pumping laser is incident to the ferromagnetic nano thin-film, the beam splitting
Mirror is used to the pumping laser being divided into the first beam pumping laser and the second beam pumping laser；The first beam pumping laser is incident
To high field Terahertz spin transmitter, the terahertz pulse radiation of spectrum width, default radiation field intensity is preset with generation,
The terahertz pulse radiation is incident on the GaP crystal after at least three paraboloidal mirror reflection；Described second
Beam pumping laser is incident on the GaP crystal after at least three reflecting mirror through the light hole；The optics
Delay line device for changing the second beam pumping laser light path；
The second beam pumping laser is disposed with quarter-wave plate, irrigates in the optical path after the GaP crystal
Lars prism and balance energy-probe, the equilibrium energy detector are electrically connected with the oscillograph.
Preferably, the equilibrium energy detector specifically includes: the first silicon photoelectric energy probe and the second silicon photoelectric energy
Probe；
It is mutually perpendicular sharp that the second beam pumping laser is divided into two beam direction of vibration after the Wollaston prism
Light, the two orthogonal laser of beam direction of vibration are incident to the first silicon photoelectric energy probe and the second silicon photoelectricity respectively
Energy probe.
Preferably, the optical delay line device is mechanical scanning delay line device, the mechanical scanning delay line device
It is arranged on delay line controller.
Preferably, the spectrometer further include: control device, the control device respectively with the oscillograph and described prolong
Slow lane controller communication connection.
Preferably, the beam splitter is specifically used for for the pumping laser being divided into the first beam pumping laser that accounting is 99%
The the second beam pumping laser for being 1% with accounting.
High field Terahertz spin transmitter and spectrometer provided in an embodiment of the present invention, high field Terahertz spin transmitter,
It is incident on ferromagnetic nano thin-film by predetermined pulse width, the pumping laser that single pulse energy is preset energy, is received ferromagnetic
Magnet is added around rice film and generates magnetic field, magnetizes ferromagnetic nano thin-film, pumping laser generates pre- through ferromagnetic nano thin-film
If the terahertz pulse radiation of spectrum width, default radiation field intensity is, it can be achieved that the production that ultra wide band, high field terahertz pulse radiate
It is raw.The high field Terahertz spins reflector can be to avoid in the prior art using lithium niobate crystal using the realization of ferromagnetic nano thin-film
Body is limited when realizing by crystalline size, and the frequency coverage of ultra wide band may be implemented, and light channel structure is simple, is easy to real
It is existing.The spectrometer provided in the embodiment of the present invention, due to using the Terahertz arteries and veins of default spectrum width, default radiation field intensity
The ultra wide band detection of 1-15THz frequency coverage may be implemented in punching radiation.Moreover, because the terahertz pulse in spectrometer
Radiation is based on ferromagnetic nano thin-film, and cost is substantially reduced relative to traditional organic crystal.Due to current ultra-wideband-light spectrometer
It is mostly based on plasma source, poor signal to noise；And in the spectrometer of organic crystal, the source of organic crystal is easy to deliquesce, also not
It is easy to control.Above-mentioned technical problem is completely absent in the spectrometer provided in the embodiment of the present invention.The last embodiment of the present invention
Optical path is simple in the spectrometer of middle offer, is easily integrated.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of structural side view for high field Terahertz spin transmitter that one embodiment of the invention provides；
Fig. 2 be another embodiment of the present invention provides a kind of high field Terahertz spin transmitter structure top view；
Fig. 3 be another embodiment of the present invention provides a kind of high field Terahertz spin transmitter in ferromagnetic nano thin-film and magnetic
Positional diagram between iron；
Fig. 4 be another embodiment of the present invention provides a kind of high field Terahertz spin transmitter structural schematic diagram；
Fig. 5 be another embodiment of the present invention provides a kind of spectrometer structural schematic diagram；
Fig. 6 be another embodiment of the present invention provides a kind of spectrometer structural schematic diagram.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
One embodiment of the invention provides a kind of high field Terahertz spin transmitter, comprising: the ferromagnetic nanometer of pre-set dimension
Film, the first magnet and the second magnet；
First magnet and second magnet are both secured in plane locating for the ferromagnetic nano thin-film, and described
First magnet and second magnet setting point-blank, the of the first pole of first magnet and second magnet
Two poles are oppositely arranged, and the polarity of first pole and second pole is on the contrary, the ferromagnetic nano thin-film is arranged described first
Between pole and second pole；
Predetermined pulse width, the pumping laser that single pulse energy is preset energy penetrate the ferromagnetic nano thin-film, generate
The terahertz pulse radiation of default spectrum width, default radiation field intensity.
Specifically, as shown in Figure 1, Figure 2 and Figure 3, Fig. 1 is a kind of high field Terahertz spin that one embodiment of the invention provides
The structural side view of transmitter, Fig. 2 are that a kind of structure for high field Terahertz spin transmitter that one embodiment of the invention provides is bowed
View, Fig. 3 are that a kind of high field Terahertz for providing of one embodiment of the invention spins the position of magnet 121 and magnet 122 in transmitter
Set relation schematic diagram.
Due in the embodiment of the present invention using ferromagnetic nano thin-film under magnetic fields to the modulation of pumping laser, institute
It can be round, ellipse, pros to be not especially limited in the embodiment of the present invention to the concrete shape of ferromagnetic nano thin-film
Shape, rectangle or other irregular shapes, as long as the hot spot of pumping laser can be allow to be radiated on ferromagnetic nano thin-film completely
?.It is only illustrated by taking round ferromagnetic nano thin-film as an example in the embodiment of the present invention.It should be noted that ferromagnetic nano thin-film
For the ferromagnetic nano thin-film of plane.
As shown in Figure 1, one embodiment of the invention provides a kind of high field Terahertz spin transmitter, comprising: pre-set dimension
Ferromagnetic nano thin-film 11, the first magnet 121 and the second magnet 122；
First magnet 121 and the second magnet 122 are both secured in plane locating for ferromagnetic nano thin-film, and the first magnet
121 and second the setting of magnet 122 point-blank, the second of the first pole 1212 of the first magnet 121 and the second magnet 122
Pole 1221 is oppositely arranged, and the polarity of the first pole 1212 and the second pole 1221 is on the contrary, ferromagnetic nano thin-film 11 is arranged in the first pole
1212 and second between pole 1221；
Predetermined pulse width, the pumping laser that single pulse energy is preset energy are incident to one of ferromagnetic nano thin-film 11
On face, and ferromagnetic nano thin-film 11 is penetrated, generates the terahertz pulse radiation of default spectrum width, default radiation field intensity, produce
Raw terahertz pulse radiation is projected from another face of ferromagnetic nano thin-film 11.
What needs to be explained here is that the first magnet 121 and the second magnet 122 that use in the embodiment of the present invention is same magnetics
Iron.The polarity of first pole 1212 and the second pole 1221 can also be all S on the contrary, can be all N.Due to the first pole 1212 and
The polarity of two poles 1221, can the region locating for ferromagnetic nano thin-film 11 on the contrary, when i.e. magnet 121 and magnet 122 attract each other
Interior to generate uniform Distribution of Magnetic Field, ferromagnetic nano thin-film 11 changes the pump of femto-second laser output under uniform magnetic fields
The spin properties of Pu laser, and then the polarization state of pumping laser is controlled, so as to so that the terahertz pulse spoke generated
The polarization state penetrated is linear polarization.The polarization direction of the terahertz pulse radiation of generation is generated perpendicular to all magnet and magnetic field
Magnetic direction.
In the embodiment of the present invention, the terahertz pulse due to needing to obtain ultra wide band, high field is radiated, and is needed using default arteries and veins
Rush width, the pumping laser that single pulse energy is preset energy, predetermined pulse width is ultrashort femtosecond pulse, and preset energy is usual
For high-energy.The spectrum width of the terahertz pulse radiation of generation is directly related with the pulse width of pumping laser, pumping laser
Pulse width it is narrower, the spectrum width of the terahertz pulse of generation radiation is wider.The radiation of the terahertz pulse radiation of generation
Field intensity is related with the single pulse energy of pumping laser, and the single pulse energy of pumping laser is higher, the terahertz pulse spoke of generation
The radiation field intensity penetrated is stronger.Pulse width by controlling pumping laser is the pulse of predetermined pulse width, pumping laser
Energy is default single pulse energy, generates the terahertz pulse radiation of default spectrum width, default radiation field intensity.As preferred
Scheme, the predetermined pulse width chosen in the embodiment of the present invention are the pulse width less than 100fs, and the preset energy of selection is big
In the energy of mJ magnitude；Correspondingly, the default spectrum width of the terahertz pulse radiation of generation is the spectrum width greater than 4THz,
The default radiation field intensity of the terahertz pulse radiation of generation is that peak electric field intensity is greater than 1MV/cm, peak magnetic field intensity is greater than
0.3Tesla。
For example, the pumping laser for using pulse width to be 500mJ for 25fs, single pulse energy penetrates ferromagnetic nano thin-film,
It can produce the Terahertz spectrum width distribution of 1-15THz, the peak value electric field of terahertz pulse radiation can reach 3MV/cm, peak value magnetic
Field can reach 1Tesla.
In the embodiment of the present invention, since pumping laser of the ferromagnetic nano thin-film to femtosecond has high absorption coefficient,
Ferromagnetic nano thin-film is destroyed when irradiating ferromagnetic nano thin-film in order to avoid pumping laser, is needed the size of ferromagnetic nano thin-film
It does greatly, to reduce the power density of pumping laser, ferromagnetic nano thin-film is avoided to be destroyed.The size of ferromagnetic nano thin-film is by pumping
The spot size of Pu laser determines that the i.e. determination of pre-set dimension is determined by the spot size of pumping laser, in the embodiment of the present invention
Pre-set dimension is not specifically limited.Moreover, expand device can also be used and expand pumping laser when preset energy is very high
Beam needs to choose bigger pre-set dimension at this time to increase the spot size of pumping laser.
The high field Terahertz spin transmitter provided in the embodiment of the present invention, passes through predetermined pulse width, single pulse energy
It is incident on ferromagnetic nano thin-film for the pumping laser of preset energy, magnet is added around ferromagnetic nano thin-film and generates magnetic field,
Magnetize ferromagnetic nano thin-film, pumping laser generates default spectrum width through ferromagnetic nano thin-film, presets radiation field intensity
Terahertz pulse radiation is, it can be achieved that the generation that ultra wide band, high field terahertz pulse radiate.High field Terahertz spin reflector,
It is realized, can be limited when lithium columbate crystal realization by crystalline size to avoid using in the prior art using ferromagnetic nano thin-film,
And the frequency coverage of ultra wide band may be implemented, light channel structure is simple, it is easy to accomplish.
On the basis of the above embodiments, the magnetic field that the magnet provided in the embodiment of the present invention can generate is System for Low DC Magnetic Field
, it is specific to generate 100mTesla magnetic field strength below, reduce the cost of building high field Terahertz spin transmitter.
On the basis of the above embodiments, it is also wrapped in the high field Terahertz spin transmitter provided in the embodiment of the present invention
It includes: electro-conductive glass；
The electro-conductive glass is arranged on the output light path after the pumping laser penetrates the ferromagnetic nano thin-film, described
Electro-conductive glass is for transmiting the pumping laser and reflecting the terahertz pulse radiation.
Specifically, since pumping laser is through after ferromagnetic nano thin-film, generation terahertz pulse is radiated, but pumping laser
Through on the output light path after ferromagnetic nano thin-film not there is only terahertz pulse radiation, there is also not with ferromagnetic nano thin-film
The pumping laser having an effect, thus in the embodiment of the present invention by electro-conductive glass to pumping laser and terahertz pulse radiate into
Row separation.As shown in figure 4, electro-conductive glass 13 and output light path are arranged on output light path in 45 ° of angles, electro-conductive glass 13 is transmitted
Pumping laser and the terahertz pulse radiation for reflecting generation, the direction of propagation for radiating terahertz pulse deflects 90 °.
On the basis of the above embodiments, further include in the high field Terahertz spin transmitter provided in the embodiment of the present invention
First support, second support and third bracket；
The first support, the second support are identical with the third support height, and first magnet passes through solid
Hot melt adhesive is fixed in the first support, and second magnet is fixed in the second support by solid thermal melten gel, institute
Ferromagnetic nano thin-film is stated to be arranged on the third bracket.
First support, second support and third bracket in the embodiment of the present invention are respectively used to support the first magnet, second
Magnet and ferromagnetic nano thin-film.It, can also be by the first magnet, the second magnet and iron in the embodiment of the present invention unlike this scheme
Magnetic nano thin-film is each attached on circular ring shape sample stage, and two magnet are all set on the circular ring shape table top of circular ring shape sample stage
On relative position, ferromagnetic nano thin-film is fastened in the inner circle of circular ring shape sample stage, and ferromagnetic nano thin-film is in two magnet and produces
In raw magnetic field.Furthermore also the first magnet, the second magnet and ferromagnetic nano thin-film can be all made of suspension in the embodiment of the present invention
Device is suspended in the air, but is the need to ensure that the first magnet, the second magnet and ferromagnetic nano thin-film are in same level.
On the basis of the above embodiments, pumping laser can be generated by femto-second laser.Femtosecond laser implement body can be with
For femtosecond laser oscillator, femtosecond laser amplifier or optical fiber femtosecond laser.It needs to guarantee, femto-second laser is defeated
The pulse width of pumping laser out is less than 100fs.
On the basis of the above embodiments, further include in the high field Terahertz spin transmitter provided in the embodiment of the present invention
Terahertz detector；
The terahertz detector is used to detect the terahertz pulse radiation of generation.It should be noted that terahertz
The sensitivity of hereby detector detection terahertz pulse radiation wants high, just can guarantee that the hot spot of terahertz pulse radiation can be in terahertz
Hereby it is detected on detector.Meanwhile needing to adjust the electro-conductive glass radiated for separated pumping laser and terahertz pulse
Optical path, it is ensured that separate terahertz pulse radiation can be good at focusing on terahertz detector.
On the basis of the above embodiments, the ferromagnetic nano thin-film specifically includes: metal layer and ferromagnetic layer；
The metal layer is arranged in above the ferromagnetic layer, below the ferromagnetic layer or top of the ferromagnetic layer and under
Side.
Specifically, the ferromagnetic nano thin-film in the embodiment of the present invention specifically includes: metal layer and ferromagnetic layer；Metal layer can be with
Setting is above ferromagnetic layer or below ferromagnetic layer, or metal layer is provided with above and below ferromagnetic layer.Metal layer can
To be platinum (Pt), it is also possible to tungsten (W).In the embodiment of the present invention, for the generation efficiency for improving terahertz pulse radiation, it can pass through
Change the parameters such as thicknesses of layers, the number of plies of metal layer and ferromagnetic layer to optimize；Thicknesses of layers, layer that can simultaneously to metal layer
Several and the thicknesses of layers of ferromagnetic layer, the number of plies optimize, can also be respectively to the thicknesses of layers of metal layer, the number of plies and ferromagnetic
The thicknesses of layers of layer, the number of plies optimize, and are not especially limited in the embodiment of the present invention to this.
On the basis of the above embodiments, it is also wrapped in the high field Terahertz spin transmitter provided in the embodiment of the present invention
It includes: substrate；Correspondingly, on substrate, substrate can be fastened on the inner circle of circular ring shape sample stage for the ferromagnetic nano thin-film growth
On, perhaps it is arranged on third bracket or is sling by suspension arrangement, is not specifically limited in this embodiment in the embodiment of the present invention.
Specifically, it is the generation efficiency for improving THz wave, substrate material, substrate thickness can also be optimized, with choosing
Take suitable substrate material and suitable substrate thickness.
On the basis of the above embodiments, the ferromagnetic nano thin-film provided in the embodiment of the present invention passes through magnetic control sputtering device
Preparation.
On the basis of the above embodiments, generation is also got by the way of electro-optic sampling too in the embodiment of the present invention
The spectrum width of hertz impulse radiation.Specifically, electro-optic sampling, Terahertz frequency can be realized using Terahertz spectrum characterization system
Stave levies system and needs accurate adjustment, to ensure accurately to get the spectrum width of the terahertz pulse radiation of generation.
On the basis of the above embodiments, high field Terahertz spin transmitter provided in an embodiment of the present invention, by ultrafast
Spin the mode emitted, based on unusual logic gates, in the way of external magnetisation, generates default spectrum width, presets
The terahertz pulse of radiation field intensity radiates.When generated due to two magnet and magnetic field is polarity attracting uniform magnetic field, produce
The polarization state of raw terahertz pulse radiation is linear polarization, and polarization direction is perpendicular to the magnetic direction with magnetic field.
It should be noted that two magnet in the high field Terahertz spin transmitter provided in the embodiment of the present invention generate
And magnetic field need to guarantee that entire ferromagnetic nano thin-film is all magnetized, to improve the generation efficiency of terahertz pulse radiation.
The high field Terahertz spin transmitter provided in the embodiment of the present invention has the advantages that 1) structure is simple: utilizing
The magnetic control sputtering device of relative maturity can prepare ferromagnetic nano thin-film, to obtain the radiation of high field terahertz pulse, need to make
Use the ultrashort femtosecond pulse of very high-energy as pump laser source, since ferromagnetic nano thin-film has pole to femtosecond pumping laser
High absorption coefficient needs the size by ferromagnetic nano thin-film to do greatly, to reduce in order to avoid ferromagnetic nano thin-film is destroyed
The power density of pumping laser avoids ferromagnetic nano thin-film from being destroyed by pumping laser.Without preparation in the embodiment of the present invention
The complicated micro-nano technology technology of Large-aperture photoconductive antennas, overcomes traditional terahertz pulse radiation transmitter and wants to material
Ask high, the shortcomings that structure is complicated.2) emission principle is simple: the THz wave transmitter provided in the embodiment of the present invention is based on abnormality
Logic gates obtain ultrafast spinning current by additional System for Low DC Magnetic Field field in the plane of ferromagnetic nano thin-film, to produce
Raw terahertz pulse radiation.3) at low cost: due to reducing transmitter to reduce costs without applying bias voltage
Complexity.Moreover, use ferromagnetic nano thin-film growing technology it is simple, can large area preparation, with traditional nonlinear crystal
It is compared with high lead antenna, significantly reduces the cost of transmitter.4) pulse width is wide: the terahertz provided in the embodiment of the present invention
Hereby impulse radiation transmitter, due to making the spectrum width of the THz wave generated only in ferromagnetic nano thin-film and there is no phonon
Be limited solely by femto-second laser generation pumping laser pulse width, and with the phonon vibration frequency of material itself and absorption etc.
Factor is unrelated, therefore can realize the transmitting of ultra wide band terahertz pulse radiation.
On the basis of the above embodiments, the embodiment of the invention also provides a kind of spectrometers, including in above-described embodiment
Offer high field Terahertz spin transmitter, beam splitter, at least three reflecting mirrors, at least three paraboloidal mirrors, GaP crystal,
Quarter-wave plate, Wollaston prism, equilibrium energy detector and oscillograph；
It include the first reflecting mirror and the second reflecting mirror, first reflecting mirror and described at least three reflecting mirror
Two-mirror is separately positioned on optical delay line；It include default paraboloidal mirror at least three paraboloidal mirror, it is described pre-
If being provided with light hole on paraboloidal mirror；The default paraboloidal mirror is arranged at least three reflecting mirror and the gallium phosphide
In optical path between crystal；
The beam splitter is arranged in the optical path before the pumping laser is incident to the ferromagnetic nano thin-film, the beam splitting
Mirror is used to the pumping laser being divided into the first beam pumping laser and the second beam pumping laser；The first beam pumping laser is incident
To high field Terahertz spin transmitter, the terahertz pulse radiation of spectrum width, default radiation field intensity is preset with generation,
The terahertz pulse radiation is incident on the GaP crystal after at least three paraboloidal mirror reflection；Described second
Beam pumping laser is incident on the GaP crystal after at least three reflecting mirror through the light hole；
The second beam pumping laser is disposed with quarter-wave plate, irrigates in the optical path after the GaP crystal
Lars prism and balance energy-probe, the equilibrium energy detector are electrically connected with the oscillograph.
Specifically, as shown in figure 5, for a kind of structural schematic diagram of the spectrometer provided in the embodiment of the present invention, in Fig. 5 only
It shows in high field Terahertz spin transmitter and includes the case where three reflecting mirrors and three paraboloidal mirrors.Wherein, beam splitter 51
It is arranged in the optical path before pumping laser is incident to ferromagnetic nano thin-film 52, beam splitter 51 is used to pumping laser being divided into the first beam
Pumping laser and the second beam pumping laser；First beam pumping laser is incident in high field Terahertz spin transmitter, pre- to generate
If the terahertz pulse radiation of spectrum width, default radiation field intensity, terahertz pulse are radiated through three paraboloidal mirrors 53,55 and
It is incident on GaP crystal (GaP) 512 after 56 reflections.It include default paraboloidal mirror in three paraboloidal mirrors 53,55 and 56
56, it presets and is provided with light hole on paraboloidal mirror 56；Default paraboloidal mirror 56 is arranged in three reflecting mirrors 57,58 and 511 the
In optical path between the two beam pumping laser reflecting mirrors 511 finally passed through and GaP crystal 512.After the reflection of reflecting mirror 511
Light beam mix through light hole with the high field terahertz pulse radiation generated by the first beam pumping laser and to be incident to gallium phosphide brilliant
On body 512.
It should be noted that pumping laser incident in the embodiment of the present invention is collimated light beam, the terahertz pulse of generation
Radiation is also collimated light beam, forms convergent beam after the reflection of paraboloidal mirror 53, focuses to a little 54, the i.e. coke of paraboloidal mirror 53
Point.Become divergent beams after focusing again and be incident to paraboloidal mirror 55, divergent beams become directional light after the collimation of paraboloidal mirror 55
Beam is incident on paraboloidal mirror 56.It is illustrated only in Fig. 5 in the high field Terahertz spin transmitter provided in above-described embodiment
The entire infrastructure in high field Terahertz spin transmitter is not shown in ferromagnetic nano thin-film 52.Since pumping laser is through ferromagnetic
After nano thin-film 52, the radiation of high field terahertz pulse is generated, but pumping laser is through the output light after ferromagnetic nano thin-film 52
Road is not there is only the radiation of high field terahertz pulse, there is also the pumping laser not having an effect with ferromagnetic nano thin-film 52,
So being separated by electro-conductive glass 53 to pumping laser and the radiation of high field terahertz pulse in the embodiment of the present invention.Conductive glass
Glass 53 and the transmission optical path of high field terahertz pulse radiation are in 45 ° of angles, and electro-conductive glass 53 transmits pumping laser and reflects generation
High field terahertz pulse radiation, make high field terahertz pulse radiate the direction of propagation deflect 90 °, be successfully incident to paraboloidal mirror
On 53 reflecting surface.
It on the other hand, include the first reflecting mirror 57 and the second reflecting mirror 58 in three reflecting mirrors 57,58 and 511, first is anti-
It penetrates mirror 57 and the second reflecting mirror 58 is arranged in optical delay line device, is i.e. the first reflecting mirror 57 and the second reflecting mirror 58 are arranged
In the same optical delay line device；Optical delay line device for changing the second beam pumping laser light path.
On GaP crystal 512, since the refractive index of the radiation-induced GaP crystal of high field terahertz pulse becomes
Change, this variation is visited by the second beam pumping laser combination quarter-wave plate 513, Wollaston prism 514 and equilibrium energy
Survey device 515 is i.e. knowable, by the movement of optical delay line in control optical delay line device, changes the second beam pumping laser
Light path, and then change the optical path difference of the second beam pumping laser and terahertz pulse radiation, it can record terahertz pulse spoke
The time waveform penetrated, and shown by oscillograph 516.Pass through Fourier transformation, so that it may the high field terahertz generated
The amplitude and phase information of hereby impulse radiation.
It should be noted that the quarter-wave plate in the embodiment of the present invention radiated for changing high field terahertz pulse
Polarization state, Wollaston prism are used to incident high field terahertz pulse radiation being divided into the two orthogonal lines of beam direction of vibration
Polarised light, equilibrium energy detector are used to detect the beam energy projected through Wollaston prism, and the beam energy of detection passes through
Voltage signal embodies, i.e., the output result of equilibrium energy detector is voltage signal.
When the spectrometer provided in the application embodiment of the present invention, sample to be tested is placed on a little at 54, can be obtained to
The tera-hertz spectra of sample.Specifically, when not having sample to be tested, obtained high field terahertz pulse radiation is as with reference to letter
Number, when having sample to be tested, obtained terahertz pulse radiation is as sample signal.Fu is made to reference signal and sample signal respectively
In leaf transformation, the amplitude ratio and phase difference of sample signal and reference signal can be obtained, and then available sample to be tested is too
Absorption spectra and spectrum of refractive index under hertz effect.Absorption spectra and spectrum of refractive index are the tera-hertz spectra of sample to be tested.
The spectrometer provided in the embodiment of the present invention, due to using default spectrum width, default radiation field intensity too
The ultra wide band detection of 1-15THz frequency coverage may be implemented in hertz impulse radiation.Moreover, because the terahertz in spectrometer
Hereby impulse radiation is based on ferromagnetic nano thin-film, and cost is substantially reduced relative to traditional organic crystal.Due to current ultra wide band
Spectrometer is mostly based on plasma source, poor signal to noise；And in the spectrometer of organic crystal, the source of organic crystal is easy tide
Solution, is also not easily controlled.Above-mentioned technical problem is completely absent in the spectrometer provided in the embodiment of the present invention.The last present invention
Optical path is simple in the spectrometer provided in embodiment, is easily integrated.
On the basis of the above embodiments, light barrier is provided on the spectrometer provided in the embodiment of the present invention, it is light-blocking
Plate is set in the transmission optical path of the pumping laser transmitted through electro-conductive glass 53, for blocking pumping laser, prevents pumping laser
The photosensitive of other devices in spectrometer is had an impact, and then influences the performance of spectrometer.
On the basis of the above embodiments, equilibrium energy detects implement body packet in the spectrometer provided in the embodiment of the present invention
It includes: the first silicon photoelectric energy probe and the second silicon photoelectric energy probe；
It is mutually perpendicular sharp that the second beam pumping laser is divided into two beam direction of vibration after the Wollaston prism
Light, the two orthogonal laser of beam direction of vibration are incident to the first silicon photoelectric energy probe and the second silicon photoelectricity respectively
Energy probe.
Specifically, in the embodiment of the present invention, the first silicon photoelectric energy probe and the second silicon photoelectric energy probe constitute one
Equilibrium energy detector, the first silicon photoelectric energy probe and the second silicon photoelectric energy probe are electrically connected with oscillograph.When not having
When terahertz pulse radiates, the second beam pumping laser produces after GaP crystal, quarter-wave plate and Wollaston prism
The laser energy of two raw polarization directions is in the same size, then the voltage signal difference of equilibrium energy detector output is zero.When having
For terahertz pulse radiation effects when on GaP crystal, terahertz pulse radiation can cause the refractive index of GaP crystal to occur
Variation, then make the polarization state of the second beam pumping laser change, so that the voltage signal difference of equilibrium energy detector output is not
It is zero, and is proportional to the electric field strength of terahertz pulse radiation.
On the basis of the above embodiments, the optical delay line device used in the embodiment of the present invention is mechanical scanning delay
Line apparatus, mechanical scanning delay line device are arranged on delay line controller.
On the basis of the above embodiments, in the spectrometer provided in the embodiment of the present invention further include: control device, it is described
Control device is communicated to connect with oscillograph and delay line controller respectively.
Specifically, two be joined before reflecting mirror 57 compared to Fig. 5 as shown in fig. 6, using 5 reflecting mirrors in Fig. 6
A reflecting mirror, to change the direction of propagation of the second beam pumping laser.Reflecting mirror 57 and reflecting mirror 58 are arranged at optics in Fig. 6
In delay line device, optical delay line device is arranged on delay line controller 59 (optical delay line device is not shown in Fig. 6).
Delay line controller 59 is connect with control device 517, and control device 517 is connect with oscillograph 516.
Control device 517 can be computer equipment, by 517 programming Control delay line controller 59 of control device, with
So that delay line controller 59 is controlled optical delay line device, and then changes the light of the second beam pumping laser and terahertz pulse radiation
Path difference obtains the time waveform of terahertz pulse radiation.
On the basis of the above embodiments, the beam splitter in the embodiment of the present invention is specifically used for pumping laser being divided into accounting
The second beam pumping laser that the first beam pumping laser and accounting for 99% are 1%.
On the basis of the above embodiments, the central wavelength of the pumping laser used in the embodiment of the present invention can be for
800nm, 1000nm or 1550nm.
The apparatus embodiments described above are merely exemplary, wherein described, unit can as illustrated by the separation member
It is physically separated with being or may not be, component shown as a unit may or may not be physics list
Member, it can it is in one place, or may be distributed over multiple network units.It can be selected according to the actual needs
In some or all of the modules achieve the purpose of the solution of this embodiment.Those of ordinary skill in the art are not paying creativeness
Labour in the case where, it can understand and implement.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (10)
- The transmitter 1. a kind of high field Terahertz spins characterized by comprising ferromagnetic nano thin-film, the first magnetic of pre-set dimension Iron and the second magnet；First magnet and second magnet are both secured in plane locating for the ferromagnetic nano thin-film, and described first Magnet and second magnet are arranged point-blank, the second pole of the first pole of first magnet and second magnet Be oppositely arranged, the polarity of first pole and second pole on the contrary, the ferromagnetic nano thin-film setting in first pole and Between second pole；Predetermined pulse width, the pumping laser that single pulse energy is preset energy penetrate the ferromagnetic nano thin-film, generate default The terahertz pulse radiation of spectrum width, default radiation field intensity.
- The transmitter 2. high field Terahertz according to claim 1 spins, which is characterized in that the predetermined pulse width is small In the pulse width of 100fs, the preset energy is the energy greater than mJ magnitude；Correspondingly, the default spectrum width is the spectrum width greater than 4THz, and the default radiation field intensity is peak electric field Intensity is greater than 1MV/cm, peak magnetic field intensity is greater than 0.3Tesla.
- The transmitter 3. high field Terahertz according to claim 1 spins, which is characterized in that further include: electro-conductive glass；The electro-conductive glass is arranged on the output light path after the pumping laser penetrates the ferromagnetic nano thin-film, the conduction Glass is for transmiting the pumping laser and reflecting the terahertz pulse radiation.
- The transmitter 4. high field Terahertz according to any one of claim 1-3 spins, which is characterized in that further include first Bracket, second support and third bracket；The first support, the second support are identical with the third support height, and first magnet passes through solids hot melt Glue is fixed in the first support, and second magnet is fixed in the second support by solid thermal melten gel, the iron Magnetic nano thin-film is arranged on the third bracket.
- The transmitter 5. high field Terahertz according to any one of claim 1-3 spins, which is characterized in that the pumping swashs Light is generated by femto-second laser.
- 6. a kind of spectrometer, which is characterized in that spin and emit including high field Terahertz according to any one of claims 1 to 5 Device, beam splitter, at least three reflecting mirrors, at least three paraboloidal mirrors, GaP crystal, quarter-wave plate, Wollaston rib Mirror, equilibrium energy detector and oscillograph；It include the first reflecting mirror and the second reflecting mirror at least three reflecting mirror, first reflecting mirror and described second is instead Mirror is penetrated to be arranged in optical delay line device；It include default paraboloidal mirror at least three paraboloidal mirror, it is described default Light hole is provided on paraboloidal mirror；The default paraboloidal mirror setting is brilliant at least three reflecting mirror and the gallium phosphide In optical path between body；The beam splitter is arranged in the optical path before the pumping laser is incident to the ferromagnetic nano thin-film, and the beam splitter is used In the pumping laser is divided into the first beam pumping laser and the second beam pumping laser；The first beam pumping laser is incident to institute High field Terahertz spin transmitter is stated, it is described to generate the terahertz pulse radiation of default spectrum width, default radiation field intensity Terahertz pulse radiation is incident on the GaP crystal after at least three paraboloidal mirror reflection；The second beam pump Pu laser is incident on the GaP crystal after at least three reflecting mirror through the light hole；The optical delay Line apparatus for changing the second beam pumping laser light path；The second beam pumping laser be disposed in the optical path after the GaP crystal quarter-wave plate, Walla this Prism pause with balance energy-probe, the equilibrium energy detector is electrically connected with the oscillograph.
- 7. spectrometer according to claim 6, which is characterized in that the equilibrium energy detector specifically includes: the first silicon Photoelectric energy probe and the second silicon photoelectric energy probe；The second beam pumping laser is divided into the two mutually perpendicular laser of beam direction of vibration after the Wollaston prism, and two The orthogonal laser of beam direction of vibration is incident to the first silicon photoelectric energy probe and the second silicon photoelectric energy respectively Probe.
- 8. spectrometer according to claim 6, which is characterized in that the optical delay line device is mechanical scanning delay line Device, the mechanical scanning delay line device are arranged on delay line controller.
- 9. spectrometer according to claim 8, which is characterized in that further include: control device, the control device respectively with The oscillograph and delay line controller communication connection.
- 10. the spectrometer according to any one of claim 6-9, which is characterized in that the beam splitter is specifically used for institute It states pumping laser and is divided into the first beam pumping laser that accounting is 99% and the second beam pumping laser that accounting is 1%.
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| CN110018132A (en) * | 2019-05-20 | 2019-07-16 | 北京航空航天大学青岛研究院 | A kind of spin biosensor and terahertz time-domain spectroscopy system |
| CN110556688A (en) * | 2019-09-28 | 2019-12-10 | 北京航空航天大学合肥创新研究院 | terahertz generation device |
| CN111916976A (en) * | 2020-08-10 | 2020-11-10 | 北京航空航天大学 | Spin-emission-based ultra-wideband polarization tunable terahertz radiation source |
| CN113567388A (en) * | 2021-07-22 | 2021-10-29 | 中国电子科技集团公司第四十一研究所 | Terahertz generation module integrated with electronic spin chip and time-domain spectroscopy system |
| CN116470372A (en) * | 2023-04-18 | 2023-07-21 | 中国人民解放军国防科技大学 | Spin terahertz wave emitter of monolayer ferromagnetic alloy and preparation method thereof |
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