CN102902126B - Light-operated Terahertz wave speed-sensitive switch device and method thereof - Google Patents
Light-operated Terahertz wave speed-sensitive switch device and method thereof Download PDFInfo
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- CN102902126B CN102902126B CN201210368886.6A CN201210368886A CN102902126B CN 102902126 B CN102902126 B CN 102902126B CN 201210368886 A CN201210368886 A CN 201210368886A CN 102902126 B CN102902126 B CN 102902126B
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Abstract
The invention discloses a light-operated Terahertz wave speed-sensitive switch device and a method thereof. The light-operated Terahertz wave speed-sensitive switch device comprises a Terahertz wave input end, a laser input end and N*N structure units, wherein N is a natural number. The N*N structure units are distributed on a plane perpendicular to the input direction of a Terahertz wave in periodic mode. Each structure unit includes a metal structure layer, a base body and a metal thin film layer, wherein the metal structure layer is connected with the base body and composed of an X-type metal member and four T-type metal members, the X-type metal member intersects at the central position of the metal structure layer in perpendicular mode, the end portions of the four T-type metal members are respectively connected with four end points of the X-type metal member, and the other side of the base body is connected with the metal thin film layer. The light-operated Terahertz wave speed-sensitive switch device is simple and compact in structure, convenient to manufacture, fast in response, convenient to adjust, and capable of meeting the application requirements in the fields of Terahertz wave imaging, medical diagnosis, environment monitoring, broadband mobile communication and the like.
Description
Technical field
The present invention relates to THz wave applied technical field, be specifically related to a kind of light-operated THz wave high-speed switching arrangement and method thereof.
Background technology
THz wave refers to that frequency is at 0.1～10THz, and wavelength is the electromagnetic wave within the scope of 3000～30 μ m.It coincides in long-wave band and millimeter wave, and coincides at short-wave band and infrared ray.THz wave is occupied very special position in electromagnetic spectrum.Because the problem of Terahertz wave source in the long duration is failed fine solution, people are very limited for the understanding of this wave band properties of electromagnetic radiation, the development of THz wave science and technology is very restricted, to such an extent as to this wave band is called as " Terahertz space " (the Terahertz Gap) in electromagnetic wave spectrum, thereby make its application potential fail to bring into play.Terahertz wave source and pick-up unit are successfully developed in the world at present.Research finds that THz wave is safer as a kind of high-frequency electromagnetic Bob X ray, is applied to many fields such as medical diagnosis, safety inspection, biomedicine, agricultural, space astronomy, Non-Destructive Testing and Terahertz communication.Due to the wide application prospect of THz wave, countries in the world are all very paid attention to for the research of THz wave science and technology.
The development of THz wave generation and Detection Techniques, has promoted the development of Terahertz Technology and application thereof greatly.In fields such as medical diagnosis, environmental monitoring, broadband mobile communication, astronomy, Terahertz Technology all has broad application prospects.In the time of application Terahertz Technology solving practical problems, the functional device such as terahertz waveguide, switch is to realize the requisite device of whole system function.But the function element of THz wave is the Focal point and difficult point in the application of THz wave science and technology, also launches gradually both at home and abroad for the function element research of THz wave.Existing THz wave function element is also little, and their complex structures, volume are larger, expensive conventionally, and the THz wave device of therefore miniaturization, densification is the key of THz wave technology application.
THz wave switch is a kind of very important THz wave function element, it all has broad application prospects in THz wave applications such as THz wave imaging, THz wave medical diagnosis, THz wave communication, THz wave space astronomys, but existing THz wave construction of switch complexity, making difficulty, expensive, loss is large, and response speed is slow.Therefore meet the needs of Terahertz practical application in the urgent need to working out a kind of THz wave switch simple in structure, easy to make, fast response time.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of light-operated THz wave high-speed switching arrangement and method thereof are provided.
In order to achieve the above object, technical scheme of the present invention is as follows:
Light-operated THz wave high-speed switching arrangement comprises THz wave input end, laser input end, N × N structural unit, and N is natural number; N × N structural unit periodic arrangement is in the plane vertical with THz wave input direction, structural unit comprises structured metal layer, matrix and metal film layer, structured metal layer is connected with matrix, structured metal layer is made up of an X-type metalwork and four T-shaped metalworks, X-type metalwork is vertically intersected on the center of structured metal layer, four T-shaped metalwork ends are connected with four end points of X-type metalwork respectively, and the opposite side of matrix is connected with metal film layer.
The front elevation of the N × N of a described periodic arrangement structural unit is square, and the square length of side is 170 μ m ~ 180 μ m.The material of described structured metal layer is gold, and thickness is 0.8 μ m ~ 1.0 μ m.Described matrix is polymeric material, and thickness is 105 μ m ~ 110 μ m.The material of described metal film layer is gold, and thickness is 0.8 μ m ~ 1.0 μ m.The length of described X-type metalwork is 68 μ m ~ 70 μ m, and wide is 12 μ m ~ 13 μ m; The length of T-shaped metalwork is 68 μ m ~ 70 μ m, and wide is 54 μ m ~ 56 μ m, and metal live width is 8 μ m ~ 9 μ m.
Light-operated THz wave speed-sensitive switch method is: in the time that THz wave is inputted from THz wave input end, there is no additional laser from the condition of laser input end input, the THz wave that frequency is 1.349THz is absorbed by N × N structural unit, not reflection.In the time having additional laser to input from laser input end, due to the kerr effect of polymeric material matrix, the refractive index of polymeric material matrix can change rapidly, the frequency values corresponding to absorption peak of described device changes, the THz wave that absorbed frequency is 1.349THz is before reflected back THz wave input end, input by being input to additional laser without additional laser, make frequency be the THz wave of 1.349THz by no reflection events to all reflections, realized the open close of light-operated THz wave speed-sensitive switch.
Light-operated THz wave high-speed switching arrangement of the present invention has simple and compact for structure, easy to make, and fast response time is easy to adjust, meets at field application requirements such as THz wave imaging, medical diagnosis, environmental monitoring, wide-band mobile communications.
Brief description of the drawings:
Fig. 1 is the structural unit schematic diagram of light-operated THz wave high-speed switching arrangement;
Fig. 2 is the structured metal layer schematic diagram of light-operated THz wave high-speed switching arrangement;
Fig. 3 is the front elevation of light-operated THz wave high-speed switching arrangement;
Fig. 4 is the absorption curve figure of light-operated THz wave high-speed switching arrangement under the laser irradiation condition of varying strength.
Embodiment
As shown in Fig. 1 ~ 3, light-operated THz wave high-speed switching arrangement, is characterized in that comprising THz wave input end 1, laser input end 2, N × N structural unit 3, and N is natural number; N × N structural unit 3 periodic arrangement are in the plane vertical with THz wave input direction, structural unit 3 comprises structured metal layer 4, matrix 5 and metal film layer 6, structured metal layer 4 is connected with matrix 5, structured metal layer 4 is made up of an X-type metalwork 7 and four T-shaped metalworks 8, X-type metalwork 7 is vertically intersected on the center of structured metal layer 4, four T-shaped metalwork 8 ends are connected with four end points of X-type metalwork 7 respectively, and the opposite side of matrix 5 is connected with metal film layer 6.
The front elevation of the N × N of a described periodic arrangement structural unit 3 is square, and the square length of side is 170 μ m ~ 180 μ m.The material of described structured metal layer 4 is gold, and thickness is 0.8 μ m ~ 1.0 μ m.Described matrix 5 is polymeric material, and thickness is 105 μ m ~ 110 μ m.The material of described metal film layer 6 is gold, and thickness is 0.8 μ m ~ 1.0 μ m.The length of described X-type metalwork 7 is 68 μ m ~ 70 μ m, and wide is 12 μ m ~ 13 μ m; The length of T-shaped metalwork 8 is 68 μ m ~ 70 μ m, and wide is 54 μ m ~ 56 μ m, and metal live width is 8 μ m ~ 9 μ m.
Light-operated THz wave speed-sensitive switch method is: in the time that THz wave is inputted from THz wave input end 1, under the condition that does not have additional laser to input from laser input end 2, the THz wave that frequency is 1.349THz is absorbed by N × N structural unit 3, not reflection.In the time having additional laser to input from laser input end 2, due to the kerr effect of polymeric material matrix 5, the refractive index of polymeric material matrix 5 can change rapidly, the frequency values corresponding to absorption peak of described device changes, the THz wave that absorbed frequency is 1.349THz is before reflected back THz wave input end 1, input by being input to additional laser without additional laser, make frequency be the THz wave of 1.349THz by no reflection events to all reflections, realized the open close of light-operated THz wave speed-sensitive switch.
Embodiment 1
Light-operated THz wave speed-sensitive switch:
Choice structure unit number N=50.The front elevation of the N × N of a periodic arrangement structural unit is square, and the square length of side is 175 μ m.The material of structured metal layer is gold, and thickness is 0.8 μ m.Matrix is polymeric material, and thickness is 110 μ m.The material of metal film layer is gold, and thickness is 1.0 μ m.The length of X-type metalwork is 70 μ m, and wide is 12 μ m; The length of T-shaped metalwork is 69.5 μ m, and wide is 55 μ m, and metal live width is 8 μ m.After this switchgear, have metal film layer to exist, therefore THz wave can not be gone out in transmission.In the time that THz wave is inputted from THz wave input end, there is no additional laser from the condition of laser input end input, now the THz wave of certain characteristic frequency is absorbed, not reflection.In the time having additional laser to input from laser input end, due to the kerr effect of polymeric material matrix, the refractive index of polymeric material matrix can change rapidly, the frequency values corresponding to absorption peak of designed device changes, now, the THz wave of absorbed characteristic frequency is reflected back THz wave input end before, from being input to no reflection events that the input of additional laser can realize characteristic frequency THz wave without additional laser to whole reflections, realize the open close function of light-operated THz wave speed-sensitive switch.Ear Mucosa Treated by He Ne Laser Irradiation is at the white space of structured metal layer, and under the laser irradiation condition of varying strength, the refractive index of polymeric material changes rapidly, therefore, can obtain fast the absorption peak of different frequency.As seen from Figure 4, when inputting without additional laser, additional laser is input as at 0 o'clock, and the refractive index of polymeric matrix is 1.59, and the THz wave absorptivity that is f=1.349THz for frequency is 99.93%, and reflectivity is 0.07%.When there being additional laser input, additional laser input is 18.75MW/cm by force
2time, the refractive index of polymeric matrix is 1.62, and frequency corresponding to maximum absorption band is at this moment 1.324THz, and corresponding absorptivity is 99.59%.Now, the absorptivity of the THz wave that is f=1.349THz to characteristic frequency is only 0.74%, because not transmissive of THz wave, so reflectivity is 99.26%, this has realized quick absorption or the reflection of the THz wave to f=1.349THz.Because the response time of polymeric material is exceedingly fast, therefore can realize rapidly absorption or the reflection to different frequency THz wave by changing laser intensity, realize the open close function of speed-sensitive switch.
Claims (7)
1. a light-operated THz wave high-speed switching arrangement, is characterized in that comprising THz wave input end (1), laser input end (2), N × N structural unit (3), and N is natural number, N × N structural unit (3) periodic arrangement is in the plane vertical with THz wave input direction, structural unit (3) comprises structured metal layer (4), matrix (5) and metal film layer (6), structured metal layer (4) is connected with matrix (5), structured metal layer (4) is made up of an X-type metalwork (7) and four T-shaped metalworks (8), X-type metalwork (7) is vertically intersected on the center of structured metal layer (4), four T-shaped metalworks (8) end is connected with four end points of X-type metalwork (7) respectively, the opposite side of matrix (5) is connected with metal film layer (6).
2. the light-operated THz wave high-speed switching arrangement of one as claimed in claim 1, is characterized in that the front elevation of N × N the structural unit (3) of described periodic arrangement is square, and the square length of side is 170 μ m ~ 180 μ m.
3. the light-operated THz wave high-speed switching arrangement of one as claimed in claim 1, is characterized in that the material of described structured metal layer (4) is gold, and thickness is 0.8 μ m ~ 1.0 μ m.
4. the light-operated THz wave high-speed switching arrangement of one as claimed in claim 1, is characterized in that described matrix (5) is polymeric material, and thickness is 105 μ m ~ 110 μ m.
5. the light-operated THz wave high-speed switching arrangement of one as claimed in claim 1, is characterized in that the material of described metal film layer (6) is gold, and thickness is 0.8 μ m ~ 1.0 μ m.
6. the light-operated THz wave high-speed switching arrangement of one as claimed in claim 1, is characterized in that the length of described X-type metalwork (7) is 68 μ m ~ 70 μ m, and wide is 12 μ m ~ 13 μ m; The length of T-shaped metalwork (8) is 68 μ m ~ 70 μ m, and wide is 54 μ m ~ 56 μ m, and metal live width is 8 μ m ~ 9 μ m.
7. the light-operated THz wave speed-sensitive switch method that use is installed as claimed in claim 1, it is characterized in that in the time that THz wave is inputted from THz wave input end (1), there is no additional laser from the condition of laser input end (2) input, frequency is that the THz wave of 1.349THz is absorbed by N × N structural unit (3), not reflection; In the time having additional laser to input from laser input end (2), due to the kerr effect of polymeric material matrix (5), the refractive index of polymeric material matrix (5) can change rapidly, the frequency values corresponding to absorption peak of described device changes, the THz wave that absorbed frequency is 1.349THz is before reflected back THz wave input end (1), input by being input to additional laser without additional laser, make frequency be the THz wave of 1.349THz by no reflection events to all reflections, realized the open close of light-operated THz wave speed-sensitive switch.
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| CN201946723U (en) * | 2011-03-22 | 2011-08-24 | 中国计量学院 | Terahertz filter with periodic window lattice shaped hollow structure |
| CN202259698U (en) * | 2011-10-25 | 2012-05-30 | 哈尔滨理工大学 | Fractal structure-based multi-tape polarization insensitive terahertz metamaterial absorber |
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| CN201946723U (en) * | 2011-03-22 | 2011-08-24 | 中国计量学院 | Terahertz filter with periodic window lattice shaped hollow structure |
| CN202259698U (en) * | 2011-10-25 | 2012-05-30 | 哈尔滨理工大学 | Fractal structure-based multi-tape polarization insensitive terahertz metamaterial absorber |
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| Title |
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| 丁佩，梁二军.太赫兹波段电磁超介质的应用及研究进展.《激光与光电子学进展》.2011,第48卷第071602-1至第071602-10页. * |
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