CN209044226U - The THz wave transmitter that polarization state is tunable - Google Patents
The THz wave transmitter that polarization state is tunable Download PDFInfo
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Abstract
The utility model embodiment provides a kind of THz wave transmitter that polarization state is tunable, by the way that the first electromagnet and the second electromagnet are arranged around ferromagnetic nano thin-film, it is in ferromagnetic nano thin-film in two orthogonal magnetic fields of magnetic direction, after pumping laser is incident to ferromagnetic nano thin-film, Distribution of Magnetic Field locating for ferromagnetic nano thin-film is different, it can produce the THz wave of different polarization states, realize the regulation and control of the polarization state to the THz wave of generation, and then it can realize ultra wide band linear polarization terahertz transmitter, ultra wide band circular polarization Terahertz generator and ultra-wideband elliptical polarize Terahertz generator, it can not only realize the THz wave transmitter of feeble field magnetic control polarization state, but also the THz wave transmitter of high field magnetic control polarization state may be implemented.
Description
Technical field
The utility model embodiment is related to terahertz pulse generation technology field, tunable more particularly, to 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) based on femtosecond laser 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 crystal, the laser pulse beam of 800nm and 400nm are same
When focus in air, generate air plasma, to generate a branch of THz wave.Around the THz source of plasma
Added metal spiral winding, and be powered on coil, that is, it can produce the terahertz sources of circular polarization.By the winding for changing coil
Direction can realize left-handed and dextrorotation circular polarization terahertz transmitter respectively.But the two-color fields circular polarization state THz wave is sent out
Emitter needs high-energy laser to pump, and generates the relatively inefficient of circular polarization state THz wave, and based on plasma
THz wave is highly unstable, and the Terahertz system signal noise ratio built based on such THz source is not high, is difficult that this is double-colored
Field circular polarization state THz wave transmitters applications are in actual tera-hertz spectra and imaging system.2) it is based on spiral logarithm antenna
Circular polarization state THz wave transmitter.Photoconductive antenna is designed to spiral logarithmic shape, the case where adding laser pump (ing) outside
Under, 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, i.e.,
The transmitting of the circular polarization state THz wave of left or right rotation can be obtained respectively.Circular polarization state THz wave based on photoconductive antenna
The photo-generated carrier of transmitter is easily saturated, and applying bias voltage easilys lead to photoconductive antenna breakdown, and radiation efficiency is low,
Structure is complicated, needs micro-processing technology to prepare antenna structure, and need applying bias voltage, can not apply high energy high field too
In the generation of Hertz wave.3) generation of the THz wave of circular polarization state is realized by chiral Meta Materials.In the terahertz generated
Hereby in optical path, by the additional one chiral Meta Materials device Jing Guo special designing, the THz wave of linear polarization can be modulated
At circular 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 hand
Property the design of Meta Materials device and processing it is complicated, it is especially high to the precision prescribed of processing technology, lead to the circular polarization characteristics obtained
Target can not be reached, and cost is very high.
Although the THz wave transmitting of circular polarization state can be achieved in above-mentioned THz wave transmitter, cannot achieve
Polarization state is tunable, therefore existing urgent need provides a kind of THz wave transmitter, to realize that the polarization state of THz wave of transmitting can
Tuning.
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 inclined
The THz wave transmitter that polarization state is tunable.
The utility model embodiment provides a kind of THz wave transmitter that polarization state is tunable, comprising: ferromagnetic nanometer
Film, the first electromagnet and the second electromagnet；
First electromagnet and second electromagnet are both secured in plane locating for the ferromagnetic nano thin-film, institute
The magnetic direction that the first electromagnet and second electromagnet generate is stated to be mutually perpendicular to；The ferromagnetic nano thin-film is in described the
In the first magnetic field that one electromagnet generates, and in the second magnetic field that second electromagnet generates；
Pumping laser penetrates the ferromagnetic nano thin-film, generates and is based on first electromagnet and the second electromagnet tune
The THz wave of humorous polarization state.
The THz wave transmitter that polarization state provided by the embodiment of the utility model is tunable, by ferromagnetic nano thin-film
Surrounding the first electromagnet of setting and the second electromagnet, make ferromagnetic nano thin-film be in two orthogonal magnetic fields of magnetic direction
Interior, after pumping laser is incident to ferromagnetic nano thin-film, Distribution of Magnetic Field locating for ferromagnetic nano thin-film is different, can produce difference
The THz wave of polarization state, realizes the regulation and control of the polarization state to the THz wave of generation, and then can realize ultra wide band line
It polarizes terahertz transmitter, ultra wide band circular polarization Terahertz generator and ultra-wideband elliptical and polarizes Terahertz generator, not only
The THz wave transmitter of feeble field magnetic control polarization state can be achieved, but also the THz wave hair of high field magnetic control polarization state may be implemented
Emitter.
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 structural representation for the THz wave transmitter that polarization state is tunable provided by the embodiment of the utility model
Figure；
Fig. 2 is a kind of structural representation for the THz wave transmitter that polarization state is tunable provided by the embodiment of the utility model
Figure.
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.
In the description of the utility model embodiment, it should be noted that term " center ", "upper", "lower", " left side ",
The orientation or positional relationship of the instructions such as " right side ", "vertical", "horizontal", "inner", "outside" is orientation based on the figure or position
Relationship, be merely for convenience of description the utility model embodiment and simplify description, rather than the device of indication or suggestion meaning or
Element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as implementing the utility model
The limitation of example.In addition, term " first ", " second ", " third " are used for description purposes only, it is not understood to indicate or imply phase
To importance.
In the description of the utility model embodiment, it should be noted that unless otherwise clearly defined and limited, term
" installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected, may be a detachable connection or one
Connect to body；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, it can also be indirect by intermediary
It is connected, can be the connection inside two elements.For the ordinary skill in the art, on being understood with concrete condition
State concrete meaning of the term in the utility model embodiment.
As shown in Figure 1, an embodiment of the present invention provides a kind of THz wave transmitter that polarization state is tunable, packet
It includes: ferromagnetic nano thin-film 1, the first electromagnet 2 and the second electromagnet 3；
First electromagnet 2 and the second electromagnet 3 are both secured in plane locating for ferromagnetic nano thin-film 1, the first electromagnet 2
The magnetic direction generated with the second electromagnet 3 is mutually perpendicular to；Ferromagnetic nano thin-film 1 is in the first magnetic of the first electromagnet 2 generation
In, and in the second magnetic field that the second electromagnet 3 generates；Pumping laser penetrates ferromagnetic nano thin-film 1, generates based on the
The THz wave of one electromagnet 2 and the second electromagnet 3 tuning polarization state.
Specifically, when the distribution of the external magnetic field as locating for ferromagnetic nano thin-film is different, ferromagnetic nano thin-film can be made through pumping
After the laser irradiation of Pu, the THz wave of different polarization states is generated, therefore in the utility model embodiment, is pumped using pumping laser
Ferromagnetic nano thin-film generates THz wave, the terahertz generated by two additional electromagnet of current control to magnetic nanoscale films
Hereby wave polarization state realize control, it can be achieved that ultra wide band linear polarization Terahertz generator, ultra wide band Terahertz ellipse generator and
Ultra wide band circular polarization Terahertz generator；It can not only realize the controllable transmitter of feeble field terahertz polarization, but also can also be used for partially
Shake regulatable high field Terahertz generator.
The pumping laser used in the utility model embodiment is femto-second laser pulse, and pulse width is in 1ps or less.This reality
With generating magnetic direction around ferromagnetic nano thin-film 1 by the first electromagnet 2 and the second electromagnet 3 respectively in new embodiment
Orthogonal first magnetic field and the second magnetic field, ferromagnetic nano thin-film 1 are in the second magnetic field i.e. in the first magnetic field,
I.e. ferromagnetic nano thin-film 1 simultaneously in the first magnetic field and the second magnetic field superposition and in magnetic field.
Flow through the production of electric current in size of current, the first electromagnet and the second electromagnet of the first electromagnet and the second electromagnet
The parameters such as raw moment can all cause the first magnetic field and the distribution in the second magnetic field to change, and then cause locating for ferromagnetic nano thin-film
And magnetic field change, and then the polarization state of THz wave projected from ferromagnetic nano thin-film is caused to change.Pass through tune
Whole above-mentioned parameter, the polarization state that the THz wave projected to ferromagnetic nano thin-film can be realized are tuned, and obtain required polarization
The THz wave of state.
Moreover, because the size of current for flowing through the first electromagnet and the second electromagnet directly determines this first magnetic field generated
With the magnetic field strength in the second magnetic field, and then radiation intensity and the polarization direction of THz wave are influenced, therefore change can also be passed through
Flow through radiation intensity and the polarization direction of the size of current change THz wave of the first electromagnet and the second electromagnet.
The ferromagnetic nano thin-film used in the utility model embodiment can be one layer, or multiple-layer stacked forms,
The shape of ferromagnetic nano thin-film can be the regular shapes such as round, rectangular, or irregular shape, the utility model are implemented
It is not specifically limited herein in example.
A kind of THz wave transmitter that polarization state is tunable is provided in the utility model embodiment, by receiving ferromagnetic
The first electromagnet and the second electromagnet are set around rice film, so that ferromagnetic nano thin-film is in two magnetic directions orthogonal
In magnetic field, after pumping laser is incident to ferromagnetic nano thin-film, Distribution of Magnetic Field locating for ferromagnetic nano thin-film is different, can produce
The THz wave of different polarization states, realizes the regulation and control of the polarization state to the THz wave of generation, 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,
It can not only realize the THz wave transmitter of feeble field magnetic control polarization state, but also the Terahertz of high field magnetic control polarization state may be implemented
Wave launcher.
On the basis of the above embodiments, the THz wave hair that the polarization state provided in the utility model embodiment is tunable
Emitter further include: the first power supply and second source；
First power supply is electrically connected with first electromagnet, and the second source is electrically connected with second electromagnet
It connects；
The first electric current of first electromagnet is flowed through by control and flows through the second electric current of second electromagnet, it is real
Now to the tuning of the polarization state of the THz wave.
Specifically, the first electric current is provided for the first electromagnet by the first power supply of setting in the utility model embodiment, if
It sets second source and provides the second electric current for the second electromagnet, realized by the first electric current of control and the second electric current to THz wave
The tuning of polarization state.Wherein, the first electric current of control includes the size for controlling the first electric current, the first sense of current and the first electricity
The generation moment of stream, likewise, the second electric current of control includes size, the second sense of current and second for controlling the second electric current
The generation moment of electric current.Specifically can directly it be realized by the first power supply of control and second source respectively to the first electric current and second
The control of electric current.Wherein, the first power supply can may be current source for voltage source, and second source can also be with for voltage source
For current source, this is not especially limited in the utility model embodiment.
The THz wave transmitter that the polarization state provided in the utility model embodiment is tunable, by directly controlling first
Power supply and second source realize the control to the first electric current and the second electric current, and then realize the tune to the polarization state of THz wave
It is humorous, the polarization state for tuning THz wave can be made more convenient quickly.
On the basis of the above embodiments, the THz wave hair that the polarization state provided in the utility model embodiment is tunable
Emitter, it is when first magnetic field and second magnetic field at the position of the ferromagnetic nano thin-film generate simultaneously, then described
The polarization state of THz wave is linear polarization.
Specifically, when being evenly distributed as the external magnetic field locating for the ferromagnetic nano thin-film, ferromagnetic nano thin-film can be made to pass through
After pumping laser irradiation, the THz wave of linear polarization is generated.In the utility model embodiment, when the position of ferromagnetic nano thin-film
First magnetic field and the second magnetic field at place is when generating simultaneously, the first magnetic field and the second magnetic field and magnetic field be then to be uniformly distributed, therefore
It can produce the THz wave that polarization state is linear polarization.
Due to can generate the first magnetic field and second when stream has electric current respectively inside the first electromagnet and the second electromagnet
Magnetic field, so generate simultaneously can be by controlling the first electromagnetism for the first magnetic field at the position of ferromagnetic nano thin-film and the second magnetic field
Electrical current (i.e. the first electric current and the second electric current) in iron and the second electromagnet generates realization simultaneously.By controlling the first electric current
Size and direction with the second electric current, two for can control the THz wave that linear polarization is generated in ferromagnetic nano thin-film are orthogonal
The size of photoelectric current and direction, so control generate linear polarization THz wave radiation intensity and linear polarization it is inclined
Shake direction.For example, when the first electric current is zero, the magnetic field side of the polarization direction of the THz wave of generation perpendicular to the second magnetic field
To；When the second electric current is zero, the magnetic direction of the polarization direction of the THz wave of generation perpendicular to the first magnetic field.When the first magnetic
When the magnetic field strength of field is bigger, saturated magnetization is realized to ferromagnetic nano thin-film, then by the first magnetic field in ferromagnetic nano thin-film
The photoelectric current constant magnitude of middle generation, then the polarization direction of the THz wave generated with the second magnetic field magnitude of field intensity
Change and rotates.Conversely, realizing saturation magnetic to ferromagnetic nano thin-film when the magnetic field strength in the second magnetic field is bigger
Change, then the photoelectric current constant magnitude generated in ferromagnetic nano thin-film by the second magnetic field, then the polarization side of the THz wave generated
It is rotated to the change of the magnitude of field intensity with the first magnetic field.When the magnetic field strength in the first magnetic field and the second magnetic field all
When sufficiently large, so that magnetic of the ferromagnetic nano thin-film on the magnetic direction in first magnetic field and on the magnetic direction in the second magnetic field
Change all reach saturation, then the polarization direction of the THz wave generated respectively with the first magnetic field M1Magnetic direction and the second magnetic field
M2Magnetic direction in angle of 45 degrees.
As shown in Fig. 2, ferromagnetic nano thin-film 1 in Fig. 2 be it is rectangular, the first electromagnet 2 is connected with the first power supply 21, by the
The first magnetic field M that one electromagnet 2 generates1Magnetic direction straight up, the second electromagnet 3 is connected with second source 31, by
The second magnetic field M that two electromagnet 3 generate2Magnetic direction horizontally to the right, the THz wave generated by ferromagnetic nano thin-film 1 it is inclined
Polarization state is linear polarization, and polarization direction is as shown in four-headed arrow in Fig. 2.
On the basis of the above embodiments, the THz wave hair that the polarization state provided in the utility model embodiment is tunable
Emitter, there are between generation moment and the generation moment in the second magnetic field in the first magnetic field at the position of ferromagnetic nano thin-film
When the magnetic field strength in one prefixed time interval and the first magnetic field is equal with the magnetic field strength in the second magnetic field, then the polarization of THz wave
State is circular polarization state.
Specifically, it is the THz wave for generating circular polarization state in the utility model embodiment, needs to avoid ferromagnetic nanometer thin
External magnetic field locating for film is evenly distributed, then needs to guarantee the first magnetic field at the position of ferromagnetic nano thin-film with the second magnetic field not
Can generate simultaneously, i.e., generation moment in the first magnetic field at the position of ferromagnetic nano thin-film and the second magnetic field there are successive difference,
It first generates after the first magnetic field is spaced the first prefixed time interval again and generates the second magnetic field, or first generate the second magnetic field and be spaced again
The first magnetic field is generated after one prefixed time interval.It is also desirable to guarantee the magnetic field strength in the first magnetic field and the magnetic in the second magnetic field
Field intensity is equal, this is because when the magnetic field strength in the first magnetic field is equal with the magnetic field strength in the second magnetic field, the first magnetic field and
The size for the photoelectric current that second magnetic field generates in ferromagnetic nano thin-film is then certain equal.It can guarantee at this time and generate circular polarization state
THz wave.
It should be noted that the first prefixed time interval specifically: make the THz wave electric field generated in the first magnetic field point
The time interval of 90 degree of phase delay is generated between the THz wave electric field component generated in amount and the second magnetic field.Namely
It says, to obtain the THz wave of circular polarization, then must assure that the first magnetic field and the second magnetic field generate in ferromagnetic nano thin-film
Photovoltaic radiation two orthogonal THz waves component between phase delay be necessary for 90 degree.It is assumed that the first magnetic field is first
It is generated in the second magnetic field, and the two generates the time interval (i.e. first time interval) at moment and meets two terahertzs generated just
Hereby the phase delay of wave electric field component is 90 degree, then the polarization state of the THz wave generated in this case for Left-hand circular polarization too
Hertz wave.Similarly, in the case where the second magnetic field is generated prior to the first magnetic field, and the time interval at the two generation moment is just full
The phase delay of the two THz wave electric field components generated enough is 90 degree, then the polarization of the THz wave generated in this case
State is right-hand circular polarization THz wave.
On the basis of the above embodiments, the THz wave hair that the polarization state provided in the utility model embodiment is tunable
Emitter, there are between generation moment and the generation moment in the second magnetic field in the first magnetic field at the position of ferromagnetic nano thin-film
When two prefixed time intervals, then the polarization state of THz wave is elliptical polarization；
Wherein, the second prefixed time interval specifically: make the THz wave electric field component and second generated in the first magnetic field
The time interval of the phase delay not equal to 90 degree is generated between the THz wave electric field component generated in magnetic field.
Specifically, in the utility model embodiment, when the time interval for adjusting the first magnetic field and the generation of the second magnetic field, so that
The phase delay between two THz wave electric field components generated by the induction of the two magnetic-field components is not 90 degree just, together
When the second prefixed time interval be not zero, then in this case, the polarization state of the THz wave of generation is elliptical polarization.If
First magnetic field is generated prior to the second magnetic field, and time interval is unsatisfactory for the phase of the two THz wave electric field components generated just
Delay is 90 degree, then such case can produce the THz wave of left-handed elliptical polarization；Similarly, when the second magnetic field is prior to the first magnetic
Field generates, and it is 90 degree that time interval is unsatisfactory for the phase delay of the two Terahertz electric field components generated just, then this feelings
It can produce the THz wave of right-handed elliptical polarization state under condition.
Above is to be generated not by the tunable THz wave transmitter of polarization state provided by the embodiment of the utility model
With the condition and corresponding polarization state of the THz wave of polarization state.
On the basis of the above embodiments, the THz wave hair that the polarization state provided in the utility model embodiment is tunable
Emitter further include: circular ring shape sample stage；
The ferromagnetic nano thin-film is fixed in the inner circle of the circular ring shape sample stage, first electromagnet and described
Two electromagnet are all set on the predeterminated position on the circular ring shape table top of the circular ring shape sample stage.
Specifically, settable circular ring shape sample stage in the utility model embodiment, is fixed on annulus for ferromagnetic nano thin-film
In the inner circle of shape sample stage, and the first electromagnet and the second electromagnet are all set on the circular ring shape table top of circular ring shape sample stage
Predeterminated position on.Wherein, predeterminated position is the first magnetic field for referring to make the first electromagnet and the second electromagnet to generate and the
The orthogonal position of the magnetic direction in two magnetic fields.
In the utility model embodiment, ferromagnetic nano thin-film, the first electromagnet and the second electromagnet are arranged at annulus
On shape sample stage, it is ensured that the relative position of three is fixed, and the polarization state provided in the utility model embodiment of guarantee can
The performance of the THz wave transmitter of tuning is stablized, and then guarantees the stable THz wave of output polarization state.
On the basis of the above embodiments, the THz wave hair that the polarization state provided in the utility model embodiment is tunable
Emitter, first electromagnet and second electromagnet pass through solid thermal melten gel be fixed on it is pre- on the circular ring shape table top
If on position.
The first electromagnet and the second electromagnet are fixed using solid thermal melten gel in the utility model embodiment, so
The electromagnet that the position of electromagnet can be more easily adjusted and more renewed.
On the basis of the above embodiments, the THz wave hair that the polarization state provided in the utility model embodiment is tunable
Emitter, the ferromagnetic nano thin-film specifically include: 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).It, can for the generation efficiency for improving THz wave in the utility model embodiment
The parameters such as thicknesses of layers, the number of plies by change metal layer and ferromagnetic layer optimize；Can simultaneously to the thicknesses of layers of metal layer,
The thicknesses of layers of the number of plies and ferromagnetic layer, the number of plies optimize, can also be respectively to the thicknesses of layers of metal layer, the number of plies, Yi Jitie
The thicknesses of layers of magnetosphere, 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 hair that the polarization state provided in the utility model embodiment is tunable
Emitter, the pumping laser are generated by femto-second laser；
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.
On the basis of the above embodiments, the THz wave hair that the polarization state provided in the utility model embodiment is tunable
Emitter further include: substrate；Correspondingly, over the substrate, the substrate is fastened on the circle for the ferromagnetic nano thin-film growth
In the inner circle of loop sample platform.
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.
In conclusion the THz wave transmitter that the polarization state provided in the utility model embodiment is tunable, has such as
Lower advantage:
1) the THz wave transmitter that original ferromagnetic nano thin-film obtains is integrated with the tunable function of polarization state, no
Only the terahertz to generation can be realized by simply tuning the size of current in electromagnet by two additional electromagnet
The hereby tuning of the polarization direction of wave can also be achieved the tuning of the radiation intensity to the THz wave of generation；Traditional is additional constant
The mode of magnet can only obtain the Terahertz linear polarization transmitting in a direction, to rotatory polarization direction, can only rotate additional
Static magnetic field.And the rotation of automatically controlled linear polarization and the tuning of size are realized in the utility model embodiment.
2) Tuning Principle is simple: the THz wave transmitter base that the polarization state provided in the utility model embodiment is tunable
In the principle of the reversed spin Hall effect of relative maturity, realization produces electric current in two electromagnet by external control circuit
The time interval and sequencing at raw moment, to realize the tune to phase between two THz wave electric field components of generation
Section, obtain Left-hand circular polarization, right-hand circular polarization, left-handed elliptical polarization and right-handed elliptical polarization THz wave.
3) emission band is wide: the THz wave transmitter that the polarization state provided in the utility model embodiment is tunable, by
In in ferromagnetic nano thin-film and there is no phonon, the spectrum width of the THz wave generated is made to be limited only by the arteries and veins of pumping laser
Width is rushed, and it is unrelated with the factors such as the phonon vibration frequency of material itself and absorption, therefore can realize ultra wide band THz wave
Transmitting.
4) at low cost: due to reducing transmitter to reduce costs without applying bias voltage or additional high-intensity magnetic field
Complexity.Moreover, use ferromagnetic nano thin-film growing technology it is simple, can large area preparation, with traditional non-linear crystalline substance
Body is compared with high lead antenna, significantly reduces the cost of transmitter.
5) polarization state of THz wave generated is easy to control: due to emission principle difference, the THz wave of generation it is inclined
Polarization state by the polarization beat length of pumping laser, is not only controlled by external magnetic field, it is easy to accomplish the controllable Terahertz hair of polarization state
Emitter.
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.
Through the above description of the embodiments, those skilled in the art can be understood that each embodiment can
It realizes by means of software and necessary general hardware platform, naturally it is also possible to pass through hardware.Based on this understanding, on
Stating technical solution, substantially the part that contributes to existing technology can be embodied in the form of software products in other words, should
Computer software product may be stored in a computer readable storage medium, such as ROM/RAM, magnetic disk, CD, including several fingers
It enables and using so that a computer equipment (can be personal computer, server or the network equipment etc.) executes each implementation
Method described in certain parts of example or embodiment.
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 that polarization state is tunable characterized by comprising ferromagnetic nano thin-film, the first electromagnetism
Iron and the second electromagnet；
First electromagnet and second electromagnet are both secured in plane locating for the ferromagnetic nano thin-film, and described
The magnetic direction that one electromagnet and second electromagnet generate is mutually perpendicular to；The ferromagnetic nano thin-film is in first electricity
In the first magnetic field that magnet generates, and in the second magnetic field that second electromagnet generates；
Pumping laser penetrates the ferromagnetic nano thin-film, generates inclined based on first electromagnet and second electromagnet tuning
The THz wave of polarization state.
2. the THz wave transmitter that polarization state according to claim 1 is tunable, which is characterized in that further include: first
Power supply and second source；
First power supply is electrically connected with first electromagnet, and the second source is electrically connected with second electromagnet；
The first electric current of first electromagnet is flowed through by control and flows through the second electric current of second electromagnet, realization pair
The tuning of the polarization state of the THz wave.
3. the THz wave transmitter that polarization state according to claim 1 is tunable, which is characterized in that ferromagnetic received when described
When first magnetic field and second magnetic field at the position of rice film generate simultaneously, then the polarization state of the THz wave is
Linear polarization.
4. the THz wave transmitter that polarization state according to claim 1 is tunable, which is characterized in that ferromagnetic received when described
It is pre- there are first between generation moment and the generation moment in second magnetic field in first magnetic field at the position of rice film
If when time interval and the magnetic field strength in first magnetic field equal with the magnetic field strength in second magnetic field, then the Terahertz
The polarization state of wave is circular polarization state.
5. the THz wave transmitter that polarization state according to claim 4 is tunable, which is characterized in that described first is default
Time interval specifically: make to generate too in the THz wave electric field component generated in first magnetic field and second magnetic field
The time interval of 90 degree of phase delay is generated between Hertz wave electric field component.
6. the THz wave transmitter that polarization state according to claim 4 is tunable, which is characterized in that ferromagnetic received when described
It is pre- there are second between generation moment and the generation moment in second magnetic field in first magnetic field at the position of rice film
If when time interval, then the polarization state of the THz wave is elliptical polarization；
Wherein, second prefixed time interval specifically: make in first magnetic field generate THz wave electric field component with
The time interval of the phase delay not equal to 90 degree is generated between the THz wave electric field component generated in second magnetic field.
7. the THz wave transmitter that polarization state according to claim 1 to 6 is tunable, which is characterized in that also
It include: circular ring shape sample stage；
The ferromagnetic nano thin-film is fixed in the inner circle of the circular ring shape sample stage, first electromagnet and second electricity
Magnet is all set on the predeterminated position on the circular ring shape table top of the circular ring shape sample stage.
8. the THz wave transmitter that polarization state according to claim 7 is tunable, which is characterized in that first electromagnetism
Iron and second electromagnet pass through on the predeterminated position that solid thermal melten gel is fixed on the circular ring shape table top.
9. the THz wave transmitter that polarization state according to claim 1 to 6 is tunable, which is characterized in that institute
It states ferromagnetic nano thin-film to specifically include: 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 that polarization state according to claim 1 to 6 is tunable, which is characterized in that
The pumping laser is generated by femto-second laser；
The femto-second laser is specially femtosecond laser oscillator, femtosecond laser amplifier or optical fiber femtosecond laser；It is described
The pulse width of the pumping laser of femto-second laser output is less than 1ps.
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