CN209313189U - A kind of intensity and polarization actively adjustable THz wave transmitter - Google Patents
A kind of intensity and polarization actively adjustable THz wave transmitter Download PDFInfo
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- CN209313189U CN209313189U CN201920244959.8U CN201920244959U CN209313189U CN 209313189 U CN209313189 U CN 209313189U CN 201920244959 U CN201920244959 U CN 201920244959U CN 209313189 U CN209313189 U CN 209313189U
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Abstract
The utility model discloses a kind of intensity and the adjustable THz wave transmitter of polarization active, comprising: ferroelectric layer；The conductive layer of ferroelectric layer side is set；The iron magnetic metal film that ferroelectric layer deviates from conductive layer side is set；The non-ferromagnetic metal film that iron magnetic metal film deviates from ferroelectric layer side is set；Magnetic field device, for applying horizontal direction to iron magnetic metal film and being parallel to the magnetic field of iron magnetic metal film, the direction in magnetic field is adjustable；Voltage device one end is connect with conductive layer, and the other end is connect with non-ferromagnetic metal film；Femtosecond laser source is for emitting femtosecond laser, femtosecond laser successively penetrates conductive layer, ferroelectric layer, iron magnetic metal film and non-ferromagnetic metal film along the direction perpendicular to conductive layer, under the control of magnetic field device and voltage device, generates intensity and polarize adjustable THz wave.The THz wave transmitter production cost is low, and polarization intensity can be controlled flexibly, is convenient for practical application.
Description
Technical field
The utility model relates to terahertz light electrocomponent technology fields, lead more specifically to a kind of intensity and polarization
Move adjustable THz wave transmitter.
Background technique
THz wave (THz) refers to frequency in the electromagnetic wave in the section 0.1THz-10THz, both not exclusively fits in this frequency band
It is studied with optical theory, is suitble to microwave theory not exclusively also to handle, thus in quite long one period, people are to THz
The understanding of wave band is very limited, and referred to as Terahertz " blank zone.
In recent years, with the effort of the development of modern science and technology and various countries researcher, THz technology is rapidly developed, THz wave
The features such as unique time domain impulse characteristic, low energy and broadband, can give material science, quantum information, medical diagnosis, astronomy, environment
Bring great scientific value and wide application in the fields such as monitoring, safety inspection, satellite communication, article imaging and military radar
Prospect.
In Terahertz Technology, THz wave transmitter is the Primary Component of Terahertz system.Common wide range Terahertz
Source mainly passes through the generation such as photoconductive antenna technology and finishing Flow Technique.In photoconductive antenna technology, pass through femtosecond pulse
Photo-excited semiconductor film (GaAs of such as low-temperature epitaxy) generates electron hole pair, and electron hole forms wink under the biasing of electrode
The photoelectric current of state, to give off terahertz pulse wave, the photon energy of the technical requirements exciting light is greater than semiconductor used
The band gap of material, and photoconductive antenna cost is higher.In finishing Flow Technique, by femtosecond pulse light brilliant intracorporal non-linear
Effect generates terahertz pulse wave, the technical requirements exciting light and terahertz light in brilliant intracorporal phase matched, that is to say, that right
The wavelength of exciting light is also to require, and the cost of crystal is also higher.
With the development of science and technology, some novel THz wave transmitters are suggested, and such as utilize ferromagnetic thin film and non-
The reversed spin Hall effect at ferromagnetic thin film interface generates THz wave.For the system, existing research work is concentrated mainly on iron
Magnetic material, nonferromagnetic material and number of plies design etc., go the intensity for improving terahertz emission source.The Terahertz in these researchs
The polarization direction of wave can be changed by changing externally-applied magnetic field direction.It but in these devices, cannot be simultaneously to THz wave
Polarization and intensity carry out active regulation, actual application demand cannot be fully met.
Utility model content
In view of this, to solve the above problems, the utility model provides a kind of intensity and polarization actively adjustable Terahertz
Wave launcher, technical solution are as follows:
Actively adjustable THz wave transmitter, the THz wave transmitter include: for a kind of intensity and polarization
Ferroelectric layer；
The conductive layer of the ferroelectric layer side is set；
The iron magnetic metal film that the ferroelectric layer deviates from the conductive layer side is set；
The non-ferromagnetic metal film that the iron magnetic metal film deviates from the ferroelectric layer side is set；
Magnetic field device, the magnetic field device are used to apply horizontal direction to the iron magnetic metal film and are parallel to the iron
The magnetic field of magnetic metallic film, wherein the direction in the magnetic field is adjustable；
Voltage device, one end of the voltage device are connect with the conductive layer, and the other end and the non-ferromagnetic metal are thin
Film connection；
Femtosecond laser source, the femtosecond laser source are led for emitting femtosecond laser, the femtosecond laser edge perpendicular to described
The direction of electric layer successively penetrates the conductive layer, the ferroelectric layer, the iron magnetic metal film and the non-ferromagnetic metal film,
Under the control of the magnetic field device and the voltage device, generates intensity and polarize adjustable THz wave.
Preferably, the conductive layer is the conductive layer of the permeable conductive material of transparent visible or near-infrared femtosecond laser.
Preferably, the conductive layer is the fin oxide condutire layer of conductive indium-tin oxide layer or fluorine doped or mixes the zinc oxide of aluminium and lead
Electric layer or the barium stannate conductive layer for mixing lanthanum.
Preferably, the conductive layer with a thickness of 10nm-1 μm, including endpoint value.
Preferably, the ferroelectric layer is the ferroelectric layer of the permeable ferroelectric material of transparent visible or near-infrared femtosecond laser.
Preferably, the ferroelectric layer with a thickness of 100nm-500 μm, including endpoint value.
Preferably, the iron magnetic metal film is thin for the feeromagnetic metal of Fe material or Co material or Ni material or CoFe material
Film.
Preferably, the iron magnetic metal film with a thickness of 1nm-10nm, including endpoint value.
Preferably, the non-ferromagnetic metal film with a thickness of 1nm-10nm, including endpoint value.
Preferably, the non-ferromagnetic metal film is Au material or Ag material or Pt material or Pd material or W material or Ta
The non-ferromagnetic metal film of material or Cr material or Ir material.
Compared to the prior art, of the utility model to have the beneficial effect that
The THz wave transmitter mainly includes conductive layer, ferroelectric layer, iron magnetic metal film and non-ferromagnetic metal film,
In, there are magneto-electric coupled effects between ferroelectric layer and iron magnetic metal film.Iron magnetic metal film is pumped by femtosecond laser and is produced
The reversed spin Hall effect of raw ultrafast spin current, iron magnetic metal film and non-ferromagnetic metal film interface makes ultrafast spin circulate
It is changed to the charge current of transition, to give off THz wave in non-ferromagnetic metal film side.
Apply voltage between conductive layer and non-ferromagnetic metal film, changes ferroelectricity by adjusting size and the polarity of voltage
Magneto-electric coupled effect between layer and iron magnetic metal film, changes the magnetism of iron magnetic metal film, to regulate and control the terahertz of outgoing
The hereby characteristics such as the intensity of wave and polarization.
Horizontal direction is applied to iron magnetic metal film and is parallel to the magnetic field of the iron magnetic metal film, wherein the magnetic
The direction of field is adjustable, passes through and changes the magnetic direction also controllable polarization direction for being emitted THz wave.
It follows that the THz wave transmitter production cost is low, and polarization intensity can be controlled flexibly, convenient for actually answering
With.
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 only
It is the embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to the attached drawing of offer.
Fig. 1 is the knot of a kind of intensity provided by the embodiment of the utility model and the adjustable THz wave transmitter of polarization active
Structure schematic diagram；
Fig. 2 is the system of a kind of intensity provided by the embodiment of the utility model and the adjustable THz wave transmitter of polarization active
Make method flow schematic diagram.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
To keep the above objects, features, and advantages of the utility model more obvious and easy to understand, with reference to the accompanying drawing and have
Body embodiment is described in further detail the utility model.
With reference to Fig. 1, Fig. 1 is a kind of intensity provided by the embodiment of the utility model and polarization actively adjustable THz wave hair
The structural schematic diagram of emitter, the THz wave transmitter include:
Ferroelectric layer 11；
The conductive layer 12 of 11 side of ferroelectric layer is set；
The iron magnetic metal film 13 that the ferroelectric layer 11 deviates from 12 side of conductive layer is set；
The non-ferromagnetic metal film 14 that the iron magnetic metal film 13 deviates from 11 side of ferroelectric layer is set；
Magnetic field device, the magnetic field device are used to apply horizontal direction to the iron magnetic metal film 13 and be parallel to described
The magnetic field of iron magnetic metal film 13, wherein the direction in the magnetic field is adjustable；
Voltage device 15, one end of the voltage device 15 are connect with the conductive layer 12, the other end with it is described non-ferromagnetic
Metallic film 14 connects；
Femtosecond laser source 16, the femtosecond laser source 16 is for emitting femtosecond laser, and the femtosecond laser is along perpendicular to institute
The direction for stating conductive layer 12 successively penetrates the conductive layer 12, the ferroelectric layer 11, the iron magnetic metal film 13 and described non-
Iron magnetic metal film 14 generates intensity and polarization is adjustable too under the control of the magnetic field device and the voltage device 15
Hertz wave.
It should be noted that the magnetic field device is not shown in Figure 1.
In this embodiment, which mainly includes conductive layer 12, ferroelectric layer 11, iron magnetic metal film 13
With non-ferromagnetic metal film 14, wherein there are magneto-electric coupled effects between ferroelectric layer 11 and iron magnetic metal film 13.Pass through femtosecond
Laser pump (ing) iron magnetic metal film 13 simultaneously generates ultrafast spin current, 14 interface of iron magnetic metal film 13 and non-ferromagnetic metal film
Reversed spin Hall effect makes ultrafast spin current be converted to the charge current of transition, thus in 14 side spoke of non-ferromagnetic metal film
Project THz wave.
Generated THz wave has good polarization characteristic, and polarization direction and externally-applied magnetic field direction are mutually perpendicular to,
By rotating the direction of externally-applied magnetic field, then the polarization direction of the THz wave of outgoing can be arbitrarily adjusted.
Apply voltage between conductive layer 12 and non-ferromagnetic metal film 14, by adjusting the size and polarity of voltage, adjusts
Stress intensity suffered by ferroelectric layer 11 changes due to magneto-electric coupled effect between ferroelectric layer 11 and iron magnetic metal film 13
The magnetism of iron magnetic metal film 13, and then influence iron magnetic metal film 13 and the reversed spin of 14 interface of non-ferromagnetic metal film are suddenly
That effect, to regulate and control the characteristics such as intensity and the polarization of the THz wave of outgoing.
It follows that the THz wave transmitter production cost is low, and polarization intensity can be controlled flexibly, convenient for actually answering
With.
It should be noted that the magnetic field device can be the permanent magnet being fixed on runing rest, it is also possible to four
Grade electromagnet, by the size of current in control two-stage come rotating excitation field.Its specific structure in the utility model embodiment simultaneously
It is not construed as limiting.
It should be noted that the THz wave transmitter at least further includes electricity required for connecting with the voltage device
The structures such as pole and contact conductor.
Further, the conductive layer 12 is the conduction of the permeable conductive material of transparent visible or near-infrared femtosecond laser
Layer.
Further, the conductive layer 12 includes, but are not limited to the fin oxide condutire layer of conductive indium-tin oxide layer or fluorine doped
Or it mixes the zinc oxide conductive layer of aluminium or mixes the barium stannate conductive layer of lanthanum.
Further, the conductive layer 12 with a thickness of 10nm-1 μm, including endpoint value.
For example, the conductive layer 12 with a thickness of 100nm or 500nm or 700nm.
Further, the ferroelectric layer 11 is the ferroelectricity of the permeable ferroelectric material of transparent visible or near-infrared femtosecond laser
Layer.
Further, the material of the ferroelectric layer 11 includes but is not limited to lead magnesio-niobate lead titanates (PMN-PT).
Further, the ferroelectric layer 11 with a thickness of 100nm-500 μm, including endpoint value.
For example, the ferroelectric layer 11 with a thickness of 500nm or 20 μm or 200 μm.
Further, the iron magnetic metal film 13 includes, but are not limited to Fe material or Co material or Ni material or CoFe
The iron magnetic metal film of material.
It should be noted that the material of the iron magnetic metal film 13 further includes the alloy material of above-mentioned metal.
Further, the iron magnetic metal film 13 with a thickness of 1nm-10nm, including endpoint value.
For example, the iron magnetic metal film 13 with a thickness of 2nm or 5nm or 8nm.
Further, the non-ferromagnetic metal film 14 with a thickness of 1nm-10nm, including endpoint value.
For example, the non-ferromagnetic metal film 14 with a thickness of 3nm or 6nm or 9nm.
Further, the non-ferromagnetic metal film 14 includes, but are not limited to Au material or Ag material or Pt material or Pd
The non-ferromagnetic metal film of material or W material or Ta material or Cr material or Ir material.
Further, the THz wave transmitter further include:
The protective layer that the non-ferromagnetic metal film deviates from the iron magnetic metal film side is set.
The material of the protective layer includes but is not limited to MgO or SiO2Or Al2O3Deng.
It further, is that a kind of intensity provided by the embodiment of the utility model and polarization are actively adjustable with reference to Fig. 2, Fig. 2
The production method flow diagram of THz wave transmitter, the production method include:
S201: a ferroelectric layer is provided.S202: conductive layer is grown in the side of the ferroelectric layer.
In this step, including but not limited to heavy using magnetron sputtering technique or electron beam evaporation technique or laser pulse
Product one layer of conductive layer of technology growth.
S203: iron magnetic metal film is grown away from the side of the conductive layer in the ferroelectric layer.
In this step, including but not limited to heavy using magnetron sputtering technique or molecular beam epitaxy technique or laser pulse
Product one layer of iron magnetic metal film of technology growth.
S204: non-ferromagnetic metal film is grown away from the side of the ferroelectric layer in the iron magnetic metal film.
In this step, including but not limited to heavy using magnetron sputtering technique or molecular beam epitaxy technique or laser pulse
Product one layer of non-ferromagnetic metal film of technology growth.
S205: setting magnetic field device, voltage device and femtosecond laser source.
In this step, the magnetic field device is used to apply horizontal direction to the iron magnetic metal film and be parallel to described
The magnetic field of iron magnetic metal film, wherein the direction in the magnetic field is adjustable.
One end of the voltage device is connect with the conductive layer, and the other end is connect with the non-ferromagnetic metal film.
The femtosecond laser source for emitting femtosecond laser, the femtosecond laser along the direction perpendicular to the conductive layer according to
It is secondary to penetrate the conductive layer, the ferroelectric layer, the iron magnetic metal film and the non-ferromagnetic metal film, it is filled in the magnetic field
It sets and under the control of the voltage device, generates intensity and polarize adjustable THz wave.
To a kind of intensity provided by the utility model and polarization, actively adjustable THz wave transmitter is carried out above
It is discussed in detail, specific case used herein is expounded the principles of the present invention and embodiment, the above implementation
The explanation of example is merely used to help understand the method and its core concept of the utility model；Meanwhile for the general skill of this field
Art personnel, based on the idea of the present invention, there will be changes in the specific implementation manner and application range, to sum up institute
It states, the content of the present specification should not be construed as a limitation of the present invention.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight
Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
For the device disclosed in the embodiment, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, phase
Place is closed referring to method part illustration.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that the element that the process, method, article or equipment including a series of elements is intrinsic,
It further include either the element intrinsic for these process, method, article or equipments.In the absence of more restrictions,
The element limited by sentence "including a ...", it is not excluded that in the process, method, article or equipment including the element
In there is also other identical elements.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest scope consistent with features of novelty.
Claims (10)
1. a kind of intensity and the adjustable THz wave transmitter of polarization active, which is characterized in that the THz wave transmitter packet
It includes:
Ferroelectric layer；
The conductive layer of the ferroelectric layer side is set；
The iron magnetic metal film that the ferroelectric layer deviates from the conductive layer side is set；
The non-ferromagnetic metal film that the iron magnetic metal film deviates from the ferroelectric layer side is set；
Magnetic field device, the magnetic field device are used to apply horizontal direction to the iron magnetic metal film and are parallel to the ferromagnetic gold
Belong to the magnetic field of film, wherein the direction in the magnetic field is adjustable；
Voltage device, one end of the voltage device are connect with the conductive layer, and the other end and the non-ferromagnetic metal film connect
It connects；
Femtosecond laser source, the femtosecond laser source is for emitting femtosecond laser, and the femtosecond laser is along perpendicular to the conductive layer
Direction successively penetrate the conductive layer, the ferroelectric layer, the iron magnetic metal film and the non-ferromagnetic metal film, in institute
Under the control for stating magnetic field device and the voltage device, generates intensity and polarize adjustable THz wave.
2. THz wave transmitter according to claim 1, which is characterized in that the conductive layer is transparent visible or close red
The conductive layer of the permeable conductive material of outer femtosecond laser.
3. THz wave transmitter according to claim 1, which is characterized in that the conductive layer is conductive indium-tin oxide layer
Fluorine doped fin oxide condutire layer or mix the zinc oxide conductive layer of aluminium or mix the barium stannate conductive layer of lanthanum.
4. THz wave transmitter according to claim 1, which is characterized in that the conductive layer with a thickness of 10nm-1 μ
M, including endpoint value.
5. THz wave transmitter according to claim 1, which is characterized in that the ferroelectric layer is transparent visible or close red
The ferroelectric layer of the permeable ferroelectric material of outer femtosecond laser.
6. THz wave transmitter according to claim 1, which is characterized in that the ferroelectric layer with a thickness of 100nm-
500 μm, including endpoint value.
7. THz wave transmitter according to claim 1, which is characterized in that the iron magnetic metal film be Fe material or
The iron magnetic metal film of Co material or Ni material or CoFe material.
8. THz wave transmitter according to claim 1, which is characterized in that the iron magnetic metal film with a thickness of
1nm-10nm, including endpoint value.
9. THz wave transmitter according to claim 1, which is characterized in that the non-ferromagnetic metal film with a thickness of
1nm-10nm, including endpoint value.
10. THz wave transmitter according to claim 1, which is characterized in that the non-ferromagnetic metal film is Au material
The non-ferromagnetic metal film of material or Ag material or Pt material or Pd material or W material or Ta material or Cr material or Ir material.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109818234A (en) * | 2019-02-26 | 2019-05-28 | 中国科学技术大学 | A kind of intensity and polarization actively adjustable THz wave transmitter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109818234A (en) * | 2019-02-26 | 2019-05-28 | 中国科学技术大学 | A kind of intensity and polarization actively adjustable THz wave transmitter |
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