CN208172415U - The THz wave transmitter of magnetic control polarization state - Google Patents
The THz wave transmitter of magnetic control polarization state Download PDFInfo
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- CN208172415U CN208172415U CN201820867162.9U CN201820867162U CN208172415U CN 208172415 U CN208172415 U CN 208172415U CN 201820867162 U CN201820867162 U CN 201820867162U CN 208172415 U CN208172415 U CN 208172415U
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Abstract
The utility model embodiment provides the THz wave transmitter 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 are all set 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 based at least two magnet control polarization state, 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 that the regulation and control of the polarization state to the THz wave of generation, different Distribution of Magnetic Field realize the transmitting of the Terahertz of different polarization states around ferromagnetic nano thin-film.
Description
Technical field
The utility model embodiment is related to terahertz pulse generation technology field, more particularly, to magnetic control polarization state
THz wave transmitter.
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 terahertz emission source based on ultrafast laser technique obtains fastly
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 various Terahertz function elements, the shortage of Terahertz function element greatly hinder 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 wafer, by silicon wafer 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) it is pumped based on femtosecond laser
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 crystal, 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, that is, can produce 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, is difficult 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,
It by applying bias voltage, that is, can produce the THz wave of circular polarization state, change the direction of rotation of spiral logarithm antenna, Ji Kefen
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
The THz wave of linear polarization can be modulated into circle by the additional one chiral Meta Materials device Jing Guo special designing by Lu Zhong
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 are complicated, especially high to the precision prescribed of processing technology, lead to the circular polarization characteristics obtained not
Target can be reached, and cost is very high.
Utility model content
In order to overcome the problems referred above or it at least is partially solved the above problem, the utility model embodiment provides a kind of magnetic
Control the THz wave transmitter of polarization state.
A kind of THz wave transmitter of magnetic control polarization state provided by the embodiment of the utility model, including：Femto-second laser,
Ferromagnetic nano thin-film, circular ring shape sample stage and at least two magnet；
At least two magnet is all set 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,
Every 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, along far from described ferromagnetic on each predeterminated position
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 penetrates the ferromagnetic nano thin-film, described
Electro-conductive glass is for transmiting the pumping laser and reflecting the THz wave.
It 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 in 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 by the embodiment of the utility model is exported by femto-second laser
The ferromagnetic nano thin-film of pulse pump laser light generates THz wave, and the magnetic field that magnet generates is added around ferromagnetic nano thin-film
To realize that the regulation and control to the polarization state of THz wave, different Distribution of Magnetic Field realize the hair of the Terahertz of different polarization states
It penetrates, and then can realize ultra wide band linear polarization terahertz transmitter, ultra wide band circular polarization Terahertz generator and ultra-wideband elliptical
Terahertz generator is polarized, can not only realize the THz wave transmitter of feeble field magnetic control polarization state, but also high field may be implemented
The THz wave transmitter of magnetic control polarization state.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is
Some embodiments of the utility model, for those of ordinary skill in the art, without creative efforts,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of structure side view of the THz wave transmitter for magnetic control polarization state that an embodiment of the present invention provides
Figure；
Fig. 2 is that a kind of structure of the THz wave transmitter for magnetic control polarization state that an embodiment of the present invention provides is overlooked
Figure；
Fig. 3 is the position of magnet in a kind of THz wave transmitter for magnetic control polarization state that an embodiment of the present invention provides
Set relation schematic diagram；
Fig. 4 is in a kind of THz wave transmitter for magnetic control polarization state that another embodiment of the utility model provides including three
The structural schematic diagram of a magnet；
Fig. 5 is in a kind of THz wave transmitter for magnetic control polarization state that another embodiment of the utility model provides including four
The structural schematic diagram of a magnet；
Fig. 6 is in a kind of THz wave transmitter for magnetic control polarization state that another embodiment of the utility model provides including six
The structural schematic diagram of a magnet；
Fig. 7 is in a kind of THz wave transmitter for magnetic control polarization state that another embodiment of the utility model provides including eight
The structural schematic diagram of a magnet；
Fig. 8 is in a kind of THz wave transmitter for magnetic control polarization state that another embodiment of the utility model provides including eight
The Distribution of Magnetic Field schematic diagram generated around magnet when a magnet；
Fig. 9 is the structural schematic diagram that a magnet is added in Fig. 4；
Figure 10 is a kind of structure of the THz wave transmitter for magnetic control polarization state that another embodiment of the utility model provides
Schematic diagram.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model
Example, every other embodiment obtained by those of ordinary skill in the art without making creative efforts belong to
The range of the utility model protection.
An embodiment of the present invention provides a kind of THz wave transmitter of magnetic control polarization state, including：Femtosecond laser
Device, ferromagnetic nano thin-film, circular ring shape sample stage and at least two magnet；
At least two magnet is all set 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 is a kind of magnetic control polarization state that an embodiment of the present invention provides
THz wave transmitter structural side view, Fig. 2 be a kind of magnetic control polarization state for providing of an embodiment of the present invention too
The structure top view of hertz wave launcher, Fig. 3 are a kind of Terahertz for magnetic control polarization state that an embodiment of the present invention provides
The positional diagram of magnet 131 and magnet 132 in wave launcher.
It illustrate only in Fig. 1, Fig. 2 and Fig. 3 and include the case where two magnet in THz wave transmitter.Due to the present invention
It is used in the examples be 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 for 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 are all set in 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 used in the utility model embodiment is all the same.The magnetic pole 1312 of magnet 131
It is identical or opposite with the polarity of magnetic pole 1321 of magnet 132.For example, the polarity of magnetic pole 1312 and magnetic pole 1321 can be all N,
It can be all S, the polarity for being also possible to magnetic pole 1312 is N, and the polarity of magnetic pole 1321 is S or the polarity of magnetic pole 1312 is S,
The polarity of magnetic pole 1321 is N.When the polarity of magnetic pole 1312 and magnetic pole 1321 on the contrary, i.e. magnet 131 and magnet 132 attracts each other
When, uniform Distribution of Magnetic Field can be generated in the region locating for ferromagnetic nano thin-film 12, ferromagnetic nano thin-film 12 is in uniform magnetic
Under field action, change the spin properties of the pumping laser of femto-second laser output, and then the polarization state of pumping laser is controlled
System, so as to so that the polarization state of the THz wave generated is linear polarization.The polarization direction of the THz wave of generation perpendicular to
Magnetic direction that all magnet generate and magnetic field.By increasing or decreasing the quantity of predetermined position magnet, changeable and magnetic
The magnetic direction of field, 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
Non-uniform Distribution of Magnetic Field can be generated in region locating for nano thin-film 12, that is, generates curved Distribution of Magnetic Field, ferromagnetic nanometer thin
Film 12 changes the spin properties of the pumping laser of femto-second laser output under non-uniform magnetic fields, and then swashs to pumping
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, being in a kind of THz wave transmitter for magnetic control polarization state that an embodiment of the present invention provides
Structural schematic diagram including three magnet.Each magnet in Fig. 4 is arranged at pre- on the circular ring shape table top of circular ring shape sample stage
If not showing that circular ring shape sample stage on position, in Fig. 4, the relative position of ferromagnetic nano thin-film 12 and three magnet is illustrated only
Relationship.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 locating for 135.Magnet 133, magnet 134 and magnet 135 towards ferromagnetic nano thin-film 12 magnetic pole pole
Property can be all the same, is N or is 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 magnetic pole of magnet 134 towards ferromagnetic nano thin-film 12.Above-mentioned setting can be in ferromagnetic nano thin-film
Non-uniform Distribution of Magnetic Field can be generated in region locating for 12, that is, generates curved Distribution of Magnetic Field, and 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, being in a kind of THz wave transmitter for magnetic control polarization state that an embodiment of the present invention provides
Structural schematic diagram including four magnet.Wherein, magnet 133 and magnet 135 are arranged relative to ferromagnetic nano thin-film, magnet 134
It is arranged with magnet 136 relative to ferromagnetic nano thin-film.Magnet 133, magnet 134, magnet 135 and magnet 136 are evenly distributed on circle
On circular table.Magnet 133, magnet 134, magnet 135 and magnet 136 just can towards the polarity of the magnetic pole of ferromagnetic nano thin-film 12
It is all the same, it is N or is S.Or magnet 133 and magnet 135 are just towards the polarity phase of the magnetic pole of ferromagnetic nano thin-film 12
Together, the polarity of magnet 134 and magnet 136 towards the magnetic pole of ferromagnetic nano thin-film 12 is identical, and magnet 133 and the positive court of magnet 134
Polarity to the magnetic pole of ferromagnetic nano thin-film 12 is opposite.Above-mentioned setting can generate in the region locating for ferromagnetic nano thin-film 12
Non-uniform Distribution of Magnetic Field generates curved Distribution of Magnetic Field, ferromagnetic nano thin-film 12 changes under non-uniform magnetic fields
The spin properties of the pumping laser of femto-second laser output, and then control the polarization state of pumping laser, so as to so that
The THz wave of generation 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
For elliptical polarization.
As shown in Figure 6 and Figure 7, respectively an embodiment of the present invention provide a kind of magnetic control polarization state THz wave
It include the structural schematic diagram of six magnet and eight magnet in transmitter.Every two magnet is relative to ferromagnetic nanometer in six magnet
Film setting, six magnet are evenly distributed on circular ring shape table top.Six magnet are just towards the pole of the magnetic pole of ferromagnetic nano thin-film
Property is all the same.Or two magnet in six magnet relative to the setting of ferromagnetic nano thin-film are just towards the magnetic of ferromagnetic nano thin-film
The polarity of pole is identical, and two neighboring magnet is just opposite towards the polarity of the magnetic pole of ferromagnetic nano thin-film in six magnet.Eight magnetic
Every two magnet is arranged relative to ferromagnetic nano thin-film in iron, and six magnet are evenly distributed on circular ring shape table top.Eight magnet
It is just all the same towards the polarity of the magnetic pole of ferromagnetic nano thin-film.Or two be arranged in eight magnet relative to ferromagnetic nano thin-film
A magnet is just identical towards the polarity of the magnetic pole of ferromagnetic nano thin-film, and two neighboring magnet is just towards ferromagnetic nanometer in eight magnet
The polarity of the magnetic pole of film is opposite.
Two magnet on circular ring shape table top and relative to the setting of ferromagnetic nano thin-film are being evenly distributed on just with eight magnet
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 is produced around magnet when being above-mentioned eight magnet in the THz wave transmitter of magnetic control polarization state
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 utility model embodiment, is generated by femto-second laser
Pulse pump laser light incident to ferromagnetic nano thin-film on, and through ferromagnetic nano thin-film generate THz wave, by ferromagnetic
The magnetic field that magnet generates is added around nano thin-film to realize the regulation and control of the polarization state to the THz wave of generation, difference
Distribution of Magnetic Field realize different polarization states Terahertz transmitting, and then can realize ultra wide band linear polarization terahertz transmitter, super
Wideband circular polarization Terahertz generator and ultra-wideband elliptical polarize Terahertz generator, can not only realize feeble field magnetic control polarization state
THz wave transmitter, 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 utility model embodiment can generate is constant
Low-intensity magnetic field, it is specific to generate 100mTesla magnetic field strength below, reduce the THz wave transmitting of building magnetic control polarization state
The cost of device.
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
Touching.
Specifically, it is illustrated with structure shown in Fig. 4, on the basis of fig. 4, is preset locating for magnet 134 in 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 may be present on predeterminated position locating for magnet 134 in Fig. 4, the tool of magnet
Body quantity can be configured as needed.A magnet 137 is added, the magnetic field strength 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 can be added on the predeterminated position locating for the magnet of other in Fig. 4, it can also be in Fig. 5, Fig. 6 and Fig. 7
Shown on predeterminated position locating for any one or more magnet setting add one or more magnet, that is to say, that annulus
There can be one or more magnet on predeterminated position on the circular ring shape table top of shape sample stage.Here, several refer to one or
It is multiple.Details are not described herein in the utility model embodiment.
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.
It specifically, can be by adjusting the distribution and arrangement of magnet, to change all magnet in the utility model embodiment
Size and Orientation generate and magnetic field, so that the THz wave of linear polarization, elliptical polarization, circular polarization can be realized.Pass through magnetic field
The change in direction is, it can be achieved that the linear polarization angle of the THz wave generated is rotatable；By changing Distribution of Magnetic Field, can also realize
The polarization state of the THz wave of generation is adjusted between these three polarization states of linear polarization, elliptical polarization and circular polarization state
Section；It can also realize the adjusting of ellipticity in elliptical polarization.
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 penetrates 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 in the utility model embodiment to pumping laser and too by electro-conductive glass
Hertz wave is separated.As shown in Figure 10, electro-conductive glass 15 and output light path are arranged on output light path in 45 ° of angles, conductive
Glass 15 transmits pumping laser and reflects the THz wave of generation, and the direction of propagation of THz wave is made to 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 utility model embodiment, can be so more convenient
Adjustment magnet position 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 optical 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 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 utility model embodiment specifically includes：Metal layer and ferromagnetic layer；Metal layer
It can be set above ferromagnetic layer or below ferromagnetic layer, or be provided with metal layer above and below ferromagnetic layer.Metal
Layer can be platinum (Pt), be also possible to tungsten (W).In the utility model embodiment, for the generation efficiency for improving THz wave, it can lead to
The parameters such as thicknesses of layers, the number of plies for changing metal layer and ferromagnetic layer are crossed 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 utility model embodiment to this.
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, 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 utility model embodiment passes through magnetron sputtering
Device preparation.
On the basis of the above embodiments, generation is also got in the utility model embodiment by the way of electro-optic sampling
THz wave spectrum width.Specifically, electro-optic sampling, Terahertz frequency spectrum can be realized using Terahertz spectrum characterization system
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 transmitting of magnetic control polarization state provided by the embodiment of the utility model
Device, in such a way that ultrafast spin emits, based on unusual logic gates, in the way of external magnetisation, by changing magnetic
Field direction realizes the adjusting of the polarization state to the THz wave of generation with distribution.In the THz wave transmitter of magnetic control polarization state
In, the polarization state of the THz wave of generation is not influenced by pumping laser polarization state, is controlled primarily by the sum that all magnet generate
The magnetic direction in magnetic field and distribution.When being the attracting uniform magnetic field of polarity with magnetic field, the polarization state of the terahertz emission of generation
For linear polarization, and polarization direction perpendicular to and magnetic direction.When being distributed with magnetic field for the bent magnetic field of polar repulsion, generate
Terahertz emission polarization state be circular polarization and elliptical polarization.
It should be noted that the institute in the THz wave transmitter of the magnetic control polarization state provided in the utility model embodiment
Have magnet generation needs to guarantee that entire ferromagnetic nano thin-film is all magnetized with magnetic field, so that the generation for improving THz wave is imitated
Rate.
The THz wave transmitter of the magnetic control polarization state provided in the utility model embodiment has the following advantages that：1) structure
Simply：The controllable Terahertz of polarization state is realized using the ferromagnetic nano thin-film that the magnetic control sputtering device of relative maturity can be prepared
Wave overcomes traditional THz wave transmitting without the complicated micro-nano technology technology for preparing Large-aperture photoconductive antennas
The shortcomings that device is high to material requirements, and structure is complicated.2) emission principle is simple：The THz wave provided in the utility model embodiment
Transmitter is based on unusual logic gates and is obtained in the plane of ferromagnetic nano thin-film ultrafast by additional System for Low DC Magnetic Field field
Spinning current, to generate THz wave.3) at low cost：Due to being reduced without applying bias voltage to reduce costs
The complexity of transmitter.Moreover, the ferromagnetic nano thin-film growing technology used is simple, can large area preparation, and it is traditional non-
Linear crystal is compared with high lead antenna, significantly reduces the cost of transmitter.4) pulse width is wide：The utility model embodiment
The THz wave transmitter of middle offer, due to making the frequency spectrum of the THz wave generated in ferromagnetic nano thin-film and there is no phonon
Width be limited only by femto-second laser generation pumping laser pulse width, and with the phonon vibration frequency of material itself and
The factors such as absorption are unrelated, therefore can realize the transmitting of ultra wide band THz wave.5) polarization state of the THz wave generated is easy control
System：Due to emission principle difference, the polarization state of the THz wave of generation is not by the polarization beat length of pumping laser, only by outside
Magnetic field control, it is easy to accomplish the controllable terahertz transmitter of polarization state.
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：Above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations；
Although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that：
It is still possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is carried out etc.
With replacement；And these are modified or replaceed, various embodiments of the utility model technology that it does not separate the essence of the corresponding technical solution
The spirit and scope of scheme.
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 is all set 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 all the same towards the polarity of the magnetic pole of the ferromagnetic nano thin-film in iron, alternatively,
Every 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, set up several magnetic along far from the side of the ferromagnetic nano thin-film on each predeterminated position
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 penetrates 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 magnetic control polarization state according to claim 1 to 6, which is characterized in that described
At least two magnet are fixed on the predeterminated position on the circular ring shape table top by solid thermal melten gel.
8. the THz wave transmitter of magnetic control polarization state according to claim 1 to 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 magnetic control polarization state according to claim 1 to 6, which is characterized in that described
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 above and below the ferromagnetic layer.
10. the THz wave transmitter of magnetic control polarization state according to claim 1 to 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.
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