CN108594481A - The THz wave transmitter of magnetic control polarization state - Google Patents
The THz wave transmitter of magnetic control polarization state Download PDFInfo
- Publication number
- CN108594481A CN108594481A CN201810569169.7A CN201810569169A CN108594481A CN 108594481 A CN108594481 A CN 108594481A CN 201810569169 A CN201810569169 A CN 201810569169A CN 108594481 A CN108594481 A CN 108594481A
- Authority
- CN
- China
- Prior art keywords
- magnet
- thz wave
- film
- nano thin
- polarization state
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0136—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour for the control of polarisation, e.g. state of polarisation [SOP] control, polarisation scrambling, TE-TM mode conversion or separation
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2203/00—Function characteristic
- G02F2203/13—Function characteristic involving THZ radiation
Abstract
An embodiment of the present invention provides the THz wave transmitters of magnetic control polarization state, including femto-second laser, ferromagnetic nano thin-film, circular ring shape sample stage and at least two magnet；At least two magnet may be contained on the predeterminated position on the circular ring shape table top of circular ring shape sample stage, and ferromagnetic nano thin-film is fastened in the inner circle of circular ring shape sample stage, and ferromagnetic nano thin-film is in the magnetic field of at least two magnet generation；A magnetic pole of each magnet is just towards ferromagnetic nano thin-film at least two magnet；The pumping laser of femto-second laser output penetrates ferromagnetic nano thin-film, generates the THz wave that polarization state is controlled based at least two magnet, and THz wave is projected by the inner circle of circular ring shape sample stage.The ferromagnetic nano thin-film of pulse pump laser light generated by femto-second laser generates THz wave, externally-applied magnetic field realizes the adjusting and control of the polarization state to the THz wave of generation around ferromagnetic nano thin-film, and different Distribution of Magnetic Field realizes the transmitting of the Terahertz of different polarization states.
Description
Technical field
The present embodiments relate to terahertz pulse generation technology fields, more particularly, to the terahertz of magnetic control polarization state
Hereby wave launcher.
Background technology
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 differentiates and identification；Terahertz frequency range means the information capacity of bigger, and better communication is provided for communication remote sensing, aerospace
Means.Terahertz emission all has the foreground of being widely applied 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 experimental study and the needs of certain applications, and therefore, the terahertz emission source based on ultrafast laser technique obtains soon
The development of speed.
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 the shortage of various Terahertz function elements, Terahertz function element greatly hinders Terahertz Technology in practical application
In progress, such as various Terahertz frequency multipliers and frequency device, polarizer shortage so that the manipulation to THz wave is extremely tired
It is difficult.The polarizer provided in the prior art includes terahertz polarization piece, and terahertz polarization piece is mostly based on integrated quartz-crystal
Body realizes the modulation of terahertz polarization state using the birefringence effect of terahertz polarization piece；Meta Materials system can be used in polarizer
It is standby, the terahertz emission of linear polarization is modulated to the THz wave of circular polarization；Polarizer includes silicon chip, by silicon chip to light
It is strong to absorb, the manufacturing cycle structure on pump light, to realize the terahertz that the THz wave of linear polarization is modulated to circular polarization
Hereby wave；Polarizer further includes the circular coil for the exploitation of air plasma source, realizes the system of the THz wave of circular polarization state
It is standby；Polarizer further includes spiral logarithm antenna, realizes the THz wave transmitting of circular polarization.
At present, it can be achieved that the THz wave transmitter of circular polarization state specifically include it is following several：1) femtosecond laser is based on to pump
The two-color fields circular polarization state THz wave transmitter at Pu.The transmitter is made using the high energy femto-second laser pulse of a branch of 800nm
With the ultrashort laser pulse for generating a branch of 400nm wavelength on BBO frequency-doubling crystals, the laser pulse beam of 800nm and 400nm are simultaneously
It focuses in air, air plasma is generated, to generate a branch of THz wave.It is outer around the THz source of plasma
Add metal spiral coil, and be powered on coil, you can generates the terahertz sources of circular polarization.By the winding side for changing coil
To can realize left-handed and dextrorotation circular polarization terahertz transmitter respectively.But the two-color fields circular polarization state THz wave emits
Device needs high-energy laser to pump, and generates the relatively inefficient of circular polarization state THz wave, and too based on plasma
Hertz wave is highly unstable, and the Terahertz system signal noise ratio built based on such THz source is not high, it is difficult to by the two-color fields
Circular polarization state THz wave transmitters applications are in actual tera-hertz spectra and imaging system.2) based on spiral logarithm antenna
Circular polarization state THz wave transmitter.Photoconductive antenna is designed to spiral logarithmic shape, in the case where adding laser pump (ing) outside,
Pass through applying bias voltage, you can generate the THz wave of circular polarization state, change the direction of rotation of spiral logarithm antenna, you can point
Not Huo get left or right rotation circular polarization state THz wave transmitting.Circular polarization state THz wave transmitting based on photoconductive antenna
The photo-generated carrier of device is easily saturated, and applying bias voltage easilys lead to photoconductive antenna breakdown, and radiation efficiency is low, structure
Complexity needs micro-processing technology to prepare antenna structure, and needs applying bias voltage, can not apply in high energy high field Terahertz
In the generation of wave.3) generation of the THz wave of circular polarization state is realized by chiral Meta Materials.In the terahertz light generated
Lu Zhong, by the additional one chiral Meta Materials device Jing Guo special designing, you can the THz wave of linear polarization is modulated into circle
Polarization.According to the design of chiral Meta Materials, the THz wave of the circular polarization state of left or right rotation can be realized respectively.But it is chiral super
Material devices design and processing is complicated, especially to the precision prescribed of processing technology height, lead to the circular polarization characteristics obtained not
Target can be reached, and cost is very high.
Invention content
It solves the above problems in order to overcome the problems referred above or at least partly, an embodiment of the present invention provides a kind of magnetic control is inclined
The THz wave transmitter of polarization state.
A kind of THz wave transmitter of magnetic control polarization state provided in an embodiment of the present invention, including：It is femto-second laser, ferromagnetic
Nano thin-film, circular ring shape sample stage and at least two magnet；
At least two magnet may be contained on the predeterminated position on the circular ring shape table top of the circular ring shape sample stage, institute
It states ferromagnetic nano thin-film to be fastened in the inner circle of the circular ring shape sample stage, the ferromagnetic nano thin-film is in described at least two
In the magnetic field that magnet generates；A magnetic pole of each magnet is just towards the ferromagnetic nano thin-film at least two magnet；
The pumping laser of the femto-second laser output penetrates the ferromagnetic nano thin-film, generates and is based on described at least two
Magnet controls the THz wave of polarization state, and the THz wave is projected by the inner circle of the circular ring shape sample stage.
Preferably, all magnet are just equal towards the polarity of the magnetic pole of the ferromagnetic nano thin-film at least two magnet
It is identical, alternatively,
Each two adjacent magnets are just towards the polarity phase of the magnetic pole of the ferromagnetic nano thin-film at least two magnet
Instead.
Preferably, the predeterminated position on the circular ring shape table top has multiple, and each predeterminated position upper edge is far from described ferromagnetic
The side of nano thin-film sets up several magnet, the opposite magnetic pole contact of several described magnet polarities.
Preferably, the polarization state of the THz wave by the quantity of magnet, each magnet at least two magnet just
The quantity of magnet determines on towards the polarity of the magnetic pole of the ferromagnetic nano thin-film and each predeterminated position.
Preferably, further include：Electro-conductive glass；
The electro-conductive glass is arranged on the output light path after the pumping laser is through the ferromagnetic nano thin-film, described
Electro-conductive glass is for transmiting the pumping laser and reflecting the THz wave.
Preferably, further include terahertz detector；
The terahertz detector is for detecting the THz wave.
Preferably, at least two magnet is fixed on the predeterminated position on the circular ring shape table top by solid thermal melten gel
On.
Preferably, the femto-second laser is specially femtosecond laser oscillator, femtosecond laser amplifier or optical fiber femtosecond
Laser；
The pulse width of the pumping laser of the femto-second laser output is less than 1ps.
Preferably, the ferromagnetic nano thin-film specifically includes：Metal layer and ferromagnetic layer；
The metal layer is arranged above the ferromagnetic layer, below the ferromagnetic layer or top of the ferromagnetic layer and under
Side.
Preferably, further include：Substrate；
Correspondingly, over the substrate, the substrate is fastened on the circular ring shape sample for the ferromagnetic nano thin-film growth
In the inner circle of platform.
The THz wave transmitter of magnetic control polarization state provided in an embodiment of the present invention, the pulse exported by femto-second laser
Pumping laser generates THz wave through ferromagnetic nano thin-film, and it is next real that the magnetic field that magnet generates is added around ferromagnetic nano thin-film
Now to the adjusting and control of the polarization state of THz wave, different Distribution of Magnetic Field realizes the transmitting of the Terahertz of different polarization states,
And then it can realize ultra wide band linear polarization terahertz transmitter, ultra wide band circular polarization Terahertz generator and ultra-wideband elliptical polarization
Terahertz generator, can not only realize the THz wave transmitter of feeble field magnetic control polarization state, but also high field magnetic control may be implemented
The THz wave transmitter of polarization state.
Description of the drawings
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 technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Some bright 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 of the THz wave transmitter for magnetic control polarization state that one embodiment of the invention provides；
Fig. 2 is a kind of structure top view of the THz wave transmitter for magnetic control polarization state that one embodiment of the invention provides；
The position of magnet is closed in a kind of THz wave transmitter for magnetic control polarization state that Fig. 3 provides for one embodiment of the invention
It is schematic diagram；
Fig. 4 is that a kind of THz wave transmitter for magnetic control polarization state that another embodiment of the present invention provides includes three magnetic
The structural schematic diagram of iron；
Fig. 5 is that a kind of THz wave transmitter for magnetic control polarization state that another embodiment of the present invention provides includes four magnetic
The structural schematic diagram of iron；
Fig. 6 is that a kind of THz wave transmitter for magnetic control polarization state that another embodiment of the present invention provides includes six magnetic
The structural schematic diagram of iron；
Fig. 7 is that a kind of THz wave transmitter for magnetic control polarization state that another embodiment of the present invention provides includes eight magnetic
The structural schematic diagram of iron；
Fig. 8 is that a kind of THz wave transmitter for magnetic control polarization state that another embodiment of the present invention provides includes eight magnetic
The Distribution of Magnetic Field schematic diagram generated around magnet when iron；
Fig. 9 is the structural schematic diagram that a magnet is added in Fig. 4；
Figure 10 is a kind of structural representation of the THz wave transmitter for magnetic control polarization state that another embodiment of the present invention provides
Figure.
Specific implementation mode
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
The 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 THz wave transmitter of magnetic control polarization state, including：Femto-second laser, iron
Magnetic nano thin-film, circular ring shape sample stage and at least two magnet；
At least two magnet may be contained on the predeterminated position on the circular ring shape table top of the circular ring shape sample stage, institute
It states ferromagnetic nano thin-film to be fastened in the inner circle of the circular ring shape sample stage, the ferromagnetic nano thin-film is in described at least two
In the magnetic field that magnet generates；A magnetic pole of each magnet is just towards the ferromagnetic nano thin-film at least two magnet；
The pumping laser of the femto-second laser output penetrates the ferromagnetic nano thin-film, generates and is based on described at least two
Magnet controls the THz wave of polarization state, and the THz wave is projected by the inner circle of the circular ring shape sample stage.
Specifically, as shown in Figure 1, Figure 2 and Figure 3, Fig. 1 be a kind of magnetic control polarization state for providing of one embodiment of the invention too
The structural side view of hertz wave launcher, Fig. 2 are a kind of THz wave hair for magnetic control polarization state that one embodiment of the invention provides
The structure top view of emitter, Fig. 3 are magnetic in the THz wave transmitter of a kind of magnetic control polarization state that one embodiment of the invention provides
The position relationship schematic diagram of iron 131 and magnet 132.
It illustrate only the case where THz wave transmitter includes two magnet in Fig. 1, Fig. 2 and Fig. 3.Due to the present invention
In embodiment using ferromagnetic nano thin-film under magnetic fields to the modulation of pumping laser, so right in the embodiment of the present invention
The concrete shape of ferromagnetic nano thin-film is not especially limited, can be round, ellipse, square, rectangle or other do not advise
Then shape, as long as can be fastened in the inner circle of circular ring shape sample stage.Only with round ferromagnetic nanometer thin in the embodiment of the present invention
It is illustrated for film.It should be noted that ferromagnetic nano thin-film is the ferromagnetic nano thin-film of plane.
THz wave transmitter specifically includes：Femto-second laser 11, ferromagnetic nano thin-film 12, magnet 131,132 and of magnet
Circular ring shape sample stage 14；
Ferromagnetic nano thin-film 12 is fixed on circular ring shape sample stage 14, and magnet 131 and magnet 132 may be contained within circular ring shape sample
On predeterminated position on the circular ring shape table top of sample platform 14, and the magnetic pole 1312 of magnet 131 and the positive court of the magnetic pole 1321 of magnet 132
To ferromagnetic nano thin-film 12, the magnetic pole 1311 of magnet 131 and the magnetic pole 1322 of magnet 132 are far from ferromagnetic nano thin-film 12.
The pumping laser that femto-second laser 11 exports is incident on a face of ferromagnetic nano thin-film 12, and is received through ferromagnetic
Rice film 12, generates the THz wave that polarization state is controlled based on magnet 131 and magnet 132, and the THz wave of generation is received from ferromagnetic
Another face of rice film 12 is projected, and is projected by the inner circle of the circular ring shape sample stage.Wherein, circular ring shape sample stage 14
Circular ring shape table top refers to the circular annular region that can be played a supportive role on circular ring shape sample stage 14, the inner circle of circular ring shape sample stage
The as inward flange of the inner circle of circular ring shape table top namely circular ring shape table top.
What needs to be explained here is that the magnet all same used in the embodiment of the present invention.The magnetic pole 1312 and magnetic of magnet 131
The polarity of the magnetic pole 1321 of iron 132 is identical or opposite.For example, the polarity of magnetic pole 1312 and magnetic pole 1321 can be all N, it can also
It is all S, the polarity that can also be magnetic pole 1312 is N, and the polarity of magnetic pole 1321 is S or the polarity of magnetic pole 1312 is S, magnetic pole
1321 polarity is N.It, can when the polarity of magnetic pole 1312 and magnetic pole 1321 on the contrary, when i.e. magnet 131 and magnet 132 attract each other
Uniform Distribution of Magnetic Field is generated in region residing for ferromagnetic nano thin-film 12, ferromagnetic nano thin-film 12 is in uniform magnetic fields
Under, change the spin properties of the pumping laser of femto-second laser output, and then control the polarization state of pumping laser, to
It is linear polarization that can make the polarization state of the THz wave of generation.The polarization direction of the THz wave of generation is perpendicular to all magnet
Magnetic direction generate and magnetic field.By increasing or decreasing the quantity of predetermined position magnet, the magnetic field with magnetic field can be changed
Direction adjusts the polarization direction of the THz wave of generation.
When magnetic pole 1312 is identical with the polarity of magnetic pole 1321, i.e. magnet 131 and when mutually exclusive magnet 132, then ferromagnetic
It will produce non-uniform Distribution of Magnetic Field in region residing for nano thin-film 12, that is, generate the Distribution of Magnetic Field of bending, ferromagnetic nanometer thin
Film 12 changes the spin properties of the pumping laser of femto-second laser output, and then swash to pumping under non-uniform magnetic fields
The polarization state of light is controlled, so as to so as to generate the THz wave of elliptical polarization.
As shown in figure 4, the THz wave transmitter for being a kind of magnetic control polarization state that one embodiment of the invention provides includes
The structural schematic diagram of three magnet.Each magnet in Fig. 4 is arranged at the default position on the circular ring shape table top of circular ring shape sample stage
It sets, circular ring shape sample stage is not showed that in Fig. 4, the relative position for illustrating only ferromagnetic nano thin-film 12 and three magnet is closed
System.Wherein, magnet 133 and magnet 135 are arranged relative to ferromagnetic nano thin-film 12, and magnet 134 is set to magnet 133 and magnet
In the vertical direction in direction residing for 135.Magnet 133, magnet 134 and magnet 135 are towards the pole of the magnetic pole of ferromagnetic nano thin-film 12
Property can all same, be N or be S.Or magnet 133 and magnet 135 are just towards the pole of the magnetic pole of ferromagnetic nano thin-film 12
Property is identical and opposite with the polarity of magnet 134 towards the magnetic pole of ferromagnetic nano thin-film 12.Above-mentioned setting can be in ferromagnetic nano thin-film
It will produce non-uniform Distribution of Magnetic Field in region residing for 12, that is, generate the Distribution of Magnetic Field of bending, ferromagnetic nano thin-film 12 is not
Under uniform magnetic fields, change the spin properties of the pumping laser of femto-second laser output, and then to the polarization of pumping laser
State is controlled, so as to so that the polarization state of the THz wave generated is elliptical polarization.
As shown in figure 5, the THz wave transmitter for being a kind of magnetic control polarization state that one embodiment of the invention provides includes
The structural schematic diagram of four magnet.Wherein, magnet 133 and magnet 135 are arranged relative to ferromagnetic nano thin-film, magnet 134 and magnetic
Iron 136 is arranged relative to ferromagnetic nano thin-film.Magnet 133, magnet 134, magnet 135 and magnet 136 are evenly distributed on circular ring shape
On table top.Magnet 133, magnet 134, magnet 135 and magnet 136 just can be homogeneous towards the polarity of the magnetic pole of ferromagnetic nano thin-film 12
Together, it is N or is S.Or magnet 133 and just identical, the magnetic towards the polarity of the magnetic pole of ferromagnetic nano thin-film 12 of magnet 135
Iron 134 is identical with the polarity of magnet 136 towards the magnetic pole of ferromagnetic nano thin-film 12, and magnet 133 and magnet 134 are just towards ferromagnetic
The polarity of the magnetic pole of nano thin-film 12 is opposite.Above-mentioned setting can will produce uneven in the region residing for ferromagnetic nano thin-film 12
Distribution of Magnetic Field, that is, generate the Distribution of Magnetic Field of bending, ferromagnetic nano thin-film 12 under non-uniform magnetic fields, change femtosecond swash
The spin properties of the pumping laser of light device output, and then control the polarization state of pumping laser, so as to so as to generate
THz wave is circular polarization state in the polarization state of some regions, and the polarization state of the THz wave in the output of other regions is ellipse
Polarization state.
As shown in Figure 6 and Figure 7, a kind of THz wave transmitting for magnetic control polarization state that respectively one embodiment of the invention provides
Device includes the structural schematic diagram of six magnet and eight magnet.Each two magnet is relative to ferromagnetic nano thin-film in six magnet
Setting, six magnet are evenly distributed on circular ring shape table top.Six magnet are just equal towards the polarity of the magnetic pole of ferromagnetic nano thin-film
It is identical.Or two magnet in six magnet relative to the setting of ferromagnetic nano thin-film are just towards the magnetic pole of ferromagnetic nano thin-film
Polarity is identical, and two neighboring magnet is just opposite towards the polarity of the magnetic pole of ferromagnetic nano thin-film in six magnet.In eight magnet
Each two magnet is arranged relative to ferromagnetic nano thin-film, and six magnet are evenly distributed on circular ring shape table top.Eight positive courts of magnet
To the polarity all same of the magnetic pole of ferromagnetic nano thin-film.Or two magnetic in eight magnet relative to the setting of ferromagnetic nano thin-film
Iron is just identical towards the polarity of the magnetic pole of ferromagnetic nano thin-film, and two neighboring magnet is just towards ferromagnetic nano thin-film in eight magnet
Magnetic pole polarity it is opposite.
Be evenly distributed on circular ring shape table top with eight magnet and two magnet being arranged relative to ferromagnetic nano thin-film just
Polarity towards the magnetic pole of ferromagnetic nano thin-film is identical, and two neighboring magnet is just towards the magnetic of ferromagnetic nano thin-film in eight magnet
For the polarity of pole is opposite, Fig. 8 be magnetic control polarization state THz wave transmitter in above-mentioned eight magnet when produced around magnet
Raw Distribution of Magnetic Field.For ferromagnetic nano thin-film under the magnetic fields, the spin for changing the pumping laser of femto-second laser output is special
Property, and then the polarization state of pumping laser is controlled, so as to so that the THz wave generated some regions polarization state
Polarization state for circular polarization state, and the THz wave in the output of other regions is elliptical polarization.
The THz wave transmitter of the magnetic control polarization state provided in the embodiment of the present invention, the arteries and veins generated by femto-second laser
It rushes pumping laser to be incident on ferromagnetic nano thin-film, and THz wave is generated through ferromagnetic nano thin-film, by ferromagnetic nanometer
The magnetic field that magnet generates is added around film to realize the adjusting and control of the polarization state to the THz wave of generation, different magnetic
The transmitting of the Terahertz of different polarization states is realized in field distribution, and then can realize ultra wide band linear polarization terahertz transmitter, ultra wide band
Circular polarization Terahertz generator and ultra-wideband elliptical polarize Terahertz generator, can not only realize feeble field magnetic control polarization state too
Hertz wave launcher, but also the THz wave transmitter of high field magnetic control polarization state may be implemented.
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 intensities below, reduce the THz wave transmitter of structure magnetic control polarization state
Cost.
On the basis of the above embodiments, the predeterminated position on the circular ring shape table top has multiple, on each predeterminated position
Several magnet are set up along the side far from the ferromagnetic nano thin-film, the opposite magnetic pole of several described magnet polarities connects
It touches.
Specifically, it is illustrated with structure shown in Fig. 4, it is default residing for magnet 134 in Fig. 4 on the basis of Fig. 4
Be not provided only with magnet 134 on position, also adding a magnet 137 along the direction far from ferromagnetic nano thin-film, obtain as
Structure shown in Fig. 9.That is, multiple magnet, the tool of magnet may be present on the predeterminated position residing for magnet 134 in Fig. 4
Body quantity can be configured as needed.A magnet 137 is added, the magnetic field intensity enhancing that the direction can be made to generate can increase
The inhomogeneities of Distribution of Magnetic Field that all magnet generate and magnetic field, and then the THz wave of exportable different polarization states.Similarly,
One or more magnet are added on predeterminated position residing for other magnet that can be in Fig. 4, it can also be in Fig. 5, Fig. 6 and Fig. 7
Shown on predeterminated position residing for any one or more magnet setting add one or more magnet, that is to say, that annulus
On predeterminated position on the circular ring shape table top of shape sample stage can there are one or multiple magnet.Here, several refer to one or
It is multiple.Details are not described herein in the embodiment of the present invention.
On the basis of the above embodiments, the polarization state of the THz wave by magnet at least two magnet number
Amount, each magnet are just true towards the quantity of magnet in the polarity of the magnetic pole of the ferromagnetic nano thin-film and each predeterminated position
It is fixed.
Specifically, it in the embodiment of the present invention, can be generated by adjusting the distribution and arrangement of magnet with changing all magnet
And magnetic field size and Orientation, to can realize linear polarization, elliptical polarization, circular polarization THz wave.Pass through magnetic direction
Change, it can be achieved that generate THz wave linear polarization angle it is rotatable；By changing Distribution of Magnetic Field, generation can also be realized
The polarization state of THz wave be adjusted between linear polarization, elliptical polarization and circular polarization state these three polarization states；Also
The adjusting of ellipticity in elliptical polarization may be implemented.
On the basis of the above embodiments, the THz wave transmitter of the magnetic control polarization state further includes：Electro-conductive glass；
The electro-conductive glass is arranged on the output light path after the pumping laser is through the ferromagnetic nano thin-film, described
Electro-conductive glass is for transmiting the pumping laser and reflecting the THz wave.
Specifically, since pumping laser is through after ferromagnetic nano thin-film, the Terahertz that polarization state is controlled based on magnet is generated
Wave, but pumping laser, through there is only THz waves on the output light path after ferromagnetic nano thin-film, there is also no and iron
The pumping laser that magnetic nano thin-film is had an effect, so by electro-conductive glass to pumping laser and Terahertz in the embodiment of the present invention
Wave is detached.As shown in Figure 10, electro-conductive glass 15 is arranged in 45 ° of angles on output light path with output light path, electro-conductive glass
15 transmission pumping lasers and the THz wave for reflecting generation, make the direction of propagation of THz wave deflect 90 °.
On the basis of the above embodiments, at least two magnet is fixed on the circular ring shape platform by solid thermal melten gel
On predeterminated position on face.
Specifically, magnet is fixed using solid thermal melten gel in the embodiment of the present invention, so can be more easily adjusted
The position of whole magnet and quantity.
On the basis of the above embodiments, the femto-second laser is specially femtosecond laser oscillator, femtosecond laser amplification
Device or optical fiber femtosecond laser；
The pulse width of the pumping laser of the femto-second laser output is less than 1ps.
On the basis of the above embodiments, the THz wave transmitter of magnetic control polarization state further includes terahertz detector；
The terahertz detector is for detecting the THz wave of generation.It should be noted that Terahertz
The sensitivity of detector detection THz wave wants high, just can guarantee that the hot spot of THz wave can be visited on terahertz detector
It measures.Meanwhile needing to adjust the light path of the electro-conductive glass for separated pumping laser and THz wave, it is ensured that separate
THz wave 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 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 both provided with above and below ferromagnetic layer.Metal layer can
Can also be tungsten (W) to be platinum (Pt).It, can be by changing gold to improve the generation efficiency of THz wave in the embodiment of the present invention
Belong to the parameters such as thicknesses of layers, the number of plies of layer and ferromagnetic layer to optimize；Can thicknesses of layers to metal layer, the number of plies simultaneously, and
The thicknesses of layers of ferromagnetic layer, the number of plies optimize, also can be respectively to the film of the thicknesses of layers of metal layer, the number of plies and ferromagnetic layer
Layer thickness, the number of plies optimize, and are not especially limited to this in the embodiment of the present invention.
On the basis of the above embodiments, the THz wave transmitter of magnetic control polarization state further includes：Substrate；Correspondingly, institute
State ferromagnetic nano thin-film growth over the substrate, the substrate is fastened in the inner circle of the circular ring shape sample stage.
Specifically, to improve the generation efficiency of 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
It prepares.
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 wave.Specifically, Terahertz spectrum characterization system may be used and realize electro-optic sampling, Terahertz spectrum characterization
System needs accurate adjustment, to ensure accurately to get the spectrum width of the THz wave of generation.
On the basis of the above embodiments, the THz wave transmitter of magnetic control polarization state provided in an embodiment of the present invention leads to
The mode for crossing ultrafast spin transmitting, based on unusual logic gates, in the way of external magnetisation, by changing magnetic direction
The adjusting of the polarization state to the THz wave of generation is realized with distribution.In the THz wave transmitter of magnetic control polarization state, production
The polarization state of raw THz wave is not influenced by pumping laser polarization state, is controlled primarily by that all magnet generate and magnetic field
Direction and distribution.When being the attracting uniform magnetic field of polarity with magnetic field, the polarization state of the terahertz emission of generation is linear polarization,
And polarization direction is perpendicular to the magnetic direction with magnetic field.When being distributed for the bent magnetic field of polar repulsion with magnetic field, generation is too
The polarization state of Hertzion radiation is circular polarization and elliptical polarization.
It should be noted that all magnetic in the THz wave transmitter of the magnetic control polarization state provided in the embodiment of the present invention
Iron generates and magnetic field needs to ensure that entire ferromagnetic nano thin-film is all magnetized, to improve the generation efficiency of THz wave.
The THz wave transmitter of the magnetic control polarization state provided in the embodiment of the present invention has the following advantages that：1) structure letter
It is single：The controllable THz wave of polarization state is realized using the ferromagnetic nano thin-film that the magnetic control sputtering device of relative maturity can be prepared,
Without the complicated micro-nano technology technology of Large-aperture photoconductive antennas is prepared, traditional THz wave transmitter pair is overcome
Material requirements is high, complicated disadvantage.2) emission principle is simple：The THz wave transmitter base provided in the embodiment of the present invention
Ultrafast spinning current is obtained in the plane of ferromagnetic nano thin-film by additional System for Low DC Magnetic Field field in unusual logic gates,
To generate THz wave.3) at low cost：Due to being not necessarily to applying bias voltage, to reduce cost, transmitter is reduced
Complexity.Moreover, use ferromagnetic nano thin-film growing technology it is simple, can large area prepare, 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 wave launcher, due in ferromagnetic nano thin-film and be not present phonon, so that the spectrum width of the THz wave of generation is only limited
In femto-second laser generate pumping laser pulse width, and with the phonon vibration frequency of material itself and absorption etc. factors without
It closes, therefore can realize the transmitting of ultra wide band THz wave.5) polarization state of the THz wave generated is easy to control：Since transmitting is former
Reason is different, and the polarization state of the THz wave of generation is only controlled by external magnetic field, is easy to not by the polarization beat length of pumping laser
Realize the controllable terahertz transmitter of polarization state.
The apparatus embodiments described above are merely exemplary, wherein the unit illustrated as separating component can
It is physically separated with being or may not be, the component shown as unit may or may not be physics list
Member, you can be located at a place, or may be distributed over multiple network units.It can be selected according to the actual needs
In some or all of module achieve the purpose of the solution of this embodiment.Those of ordinary skill in the art are not paying creativeness
Labour in the case of, you can to 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, it will be understood by those of ordinary skill in the art that：It still may be used
With technical scheme described in the above embodiments is modified or equivalent replacement of some of the technical features；
And these modifications or replacements, various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (10)
1. a kind of THz wave transmitter of magnetic control polarization state, which is characterized in that including：Femto-second laser, ferromagnetic nano thin-film,
Circular ring shape sample stage and at least two magnet；
At least two magnet may be contained on the predeterminated position on the circular ring shape table top of the circular ring shape sample stage, the iron
Magnetic nano thin-film is fastened in the inner circle of the circular ring shape sample stage, and the ferromagnetic nano thin-film is at least two magnet
In the magnetic field of generation；A magnetic pole of each magnet is just towards the ferromagnetic nano thin-film at least two magnet；
The pumping laser of the femto-second laser output penetrates the ferromagnetic nano thin-film, generates and is based at least two magnet
The THz wave of polarization state is controlled, the THz wave is projected by the inner circle of the circular ring shape sample stage.
2. the THz wave transmitter of magnetic control polarization state according to claim 1, which is characterized in that at least two magnetic
All magnet are just towards the polarity all same of the magnetic pole of the ferromagnetic nano thin-film in iron, alternatively,
Each two adjacent magnets are just opposite towards the polarity of the magnetic pole of the ferromagnetic nano thin-film at least two magnet.
3. the THz wave transmitter of magnetic control polarization state according to claim 1, which is characterized in that the circular ring shape table top
On predeterminated position have multiple, side of each predeterminated position upper edge far from the ferromagnetic nano thin-film sets up several magnetic
Iron, the opposite magnetic pole contact of several described magnet polarities.
4. the THz wave transmitter of magnetic control polarization state according to claim 3, which is characterized in that the THz wave
Polarization state is by the quantity of magnet, each magnet at least two magnet just towards the pole of the magnetic pole of the ferromagnetic nano thin-film
Property and each predeterminated position on magnet quantity determine.
5. the THz wave transmitter of magnetic control polarization state according to claim 1, which is characterized in that further include：Conductive glass
Glass；
The electro-conductive glass is arranged on the output light path after the pumping laser is through the ferromagnetic nano thin-film, the conduction
Glass is for transmiting the pumping laser and reflecting the THz wave.
6. the THz wave transmitter of magnetic control polarization state according to claim 5, which is characterized in that further include that Terahertz is visited
Survey device；
The terahertz detector is for detecting the THz wave.
7. the THz wave transmitter of the magnetic control polarization state according to any one of claim 1-6, which is characterized in that described
At least two magnet are fixed on by solid thermal melten gel on the predeterminated position on the circular ring shape table top.
8. the THz wave transmitter of the magnetic control polarization state according to any one of claim 1-6, which is characterized in that described
Femto-second laser is specially femtosecond laser oscillator, femtosecond laser amplifier or optical fiber femtosecond laser；
The pulse width of the pumping laser of the femto-second laser output is less than 1ps.
9. the THz wave transmitter of the magnetic control polarization state according to any one of claim 1-6, which is characterized in that described
Ferromagnetic nano thin-film specifically includes：Metal layer and ferromagnetic layer；
The metal layer is arranged above the ferromagnetic layer, below the ferromagnetic layer or above and below the ferromagnetic layer.
10. the THz wave transmitter of the magnetic control polarization state according to any one of claim 1-6, which is characterized in that also
Including：Substrate；
Correspondingly, over the substrate, the substrate is fastened on the circular ring shape sample stage for the ferromagnetic nano thin-film growth
In inner circle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810569169.7A CN108594481A (en) | 2018-06-05 | 2018-06-05 | The THz wave transmitter of magnetic control polarization state |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810569169.7A CN108594481A (en) | 2018-06-05 | 2018-06-05 | The THz wave transmitter of magnetic control polarization state |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108594481A true CN108594481A (en) | 2018-09-28 |
Family
ID=63630825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810569169.7A Pending CN108594481A (en) | 2018-06-05 | 2018-06-05 | The THz wave transmitter of magnetic control polarization state |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108594481A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110535003A (en) * | 2019-08-21 | 2019-12-03 | 北京航空航天大学 | A kind of spin terahertz sources device and method |
| 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 |
| CN113237834A (en) * | 2021-07-08 | 2021-08-10 | 成都信息工程大学 | Chiral molecule chiral resolution device and method based on optical spin Hall effect |
| 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 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7978394B1 (en) * | 2008-03-17 | 2011-07-12 | The United States Of America As Represented By The Secretary Of The Navy | Magnetic spin based photonic/plasmonic devices |
| CN105914564A (en) * | 2016-06-14 | 2016-08-31 | 西南交通大学 | High-strength broadband terahertz wave generator |
| CN108023263A (en) * | 2017-11-20 | 2018-05-11 | 中国工程物理研究院电子工程研究所 | A kind of magnetic field and the terahertz pulse generator of regulating and controlling voltage |
| CN208172415U (en) * | 2018-06-05 | 2018-11-30 | 北京航空航天大学 | The THz wave transmitter of magnetic control polarization state |
| US11199447B1 (en) * | 2020-10-20 | 2021-12-14 | Wisconsin Alumni Research Foundation | Single-mode, high-frequency, high-power narrowband spintronic terahertz emitter |
-
2018
- 2018-06-05 CN CN201810569169.7A patent/CN108594481A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7978394B1 (en) * | 2008-03-17 | 2011-07-12 | The United States Of America As Represented By The Secretary Of The Navy | Magnetic spin based photonic/plasmonic devices |
| CN105914564A (en) * | 2016-06-14 | 2016-08-31 | 西南交通大学 | High-strength broadband terahertz wave generator |
| CN108023263A (en) * | 2017-11-20 | 2018-05-11 | 中国工程物理研究院电子工程研究所 | A kind of magnetic field and the terahertz pulse generator of regulating and controlling voltage |
| CN208172415U (en) * | 2018-06-05 | 2018-11-30 | 北京航空航天大学 | The THz wave transmitter of magnetic control polarization state |
| US11199447B1 (en) * | 2020-10-20 | 2021-12-14 | Wisconsin Alumni Research Foundation | Single-mode, high-frequency, high-power narrowband spintronic terahertz emitter |
Non-Patent Citations (1)
| Title |
|---|
| HIBBERD M T: "Broadband Spintronic Terahertz Emitter with Magnetic-Field Manipulated Polarizations", APPLIED PHYSICS LETTER, pages 1 - 9 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110535003A (en) * | 2019-08-21 | 2019-12-03 | 北京航空航天大学 | A kind of spin terahertz sources device and method |
| 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 |
| CN113237834A (en) * | 2021-07-08 | 2021-08-10 | 成都信息工程大学 | Chiral molecule chiral resolution device and method based on optical spin Hall effect |
| CN113237834B (en) * | 2021-07-08 | 2021-09-14 | 成都信息工程大学 | Chiral molecule chiral resolution device and method based on optical spin Hall effect |
| 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 |
| CN116470372B (en) * | 2023-04-18 | 2024-01-05 | 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108594481A (en) | The THz wave transmitter of magnetic control polarization state | |
| CN108919523A (en) | The THz wave transmitter that polarization state is tunable | |
| US10408679B2 (en) | Terahertz time-domain spectroscopy system | |
| CN103487953A (en) | All-optically controlled terahertz intensity modulator and terahertz intensity modulator | |
| CN107317117A (en) | The super surface collimation lens of medium used with the collocation of Terahertz photoconductive antenna | |
| CN109061911A (en) | The THz wave transmitter that polarization state is tunable | |
| CN108981915A (en) | High field Terahertz spin transmitter and spectrometer | |
| CN109830874B (en) | Spintronic terahertz wave emitter based on voltage control magnetization | |
| KR20160057950A (en) | Terahertz wave modulator based on metamaterial | |
| CN203444187U (en) | Full-light-controlled terahertz intensity modulator and terahertz intensity modulator | |
| Zhang et al. | Light-controllable time-domain digital coding metasurfaces | |
| KR20170103269A (en) | Apparatus for generating terahertz wave and method for controlling terahertz wavefront using the same | |
| CN110690569A (en) | Terahertz photoconductive transmitting antenna with microstructure integrated on transmission line | |
| CN208847991U (en) | The THz wave transmitter that polarization state is tunable | |
| CN208172415U (en) | The THz wave transmitter of magnetic control polarization state | |
| CN208635921U (en) | High field Terahertz spin transmitter and spectrometer | |
| US8642964B2 (en) | High repetition rate photoconductive terahertz emitter using a radio frequency bias | |
| Zhang et al. | Manipulation of sub-terahertz waves using digital coding metasurfaces based on liquid crystals | |
| CN209044226U (en) | The THz wave transmitter that polarization state is tunable | |
| CN110137780A (en) | A kind of cascade terahertz-wave parametric oscillator | |
| Sederberg et al. | Perspective on phase-controlled currents in semiconductors driven by structured light | |
| CN110867717B (en) | Polarization tunable terahertz wave transmitting device based on topological insulator | |
| Song et al. | Terahertz response of fractal meta-atoms based on concentric rectangular square resonators | |
| Buryakov et al. | Efficient Co/Pt THz spintronic emitter with tunable polarization | |
| Li et al. | Spintronic terahertz polarization programmable system for information encoding |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |