CN112099247A - Light-operated dual-wavelength terahertz wave narrow-band filter based on azobenzene-doped liquid crystal material and filtering method thereof - Google Patents
Light-operated dual-wavelength terahertz wave narrow-band filter based on azobenzene-doped liquid crystal material and filtering method thereof Download PDFInfo
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- CN112099247A CN112099247A CN202010967314.4A CN202010967314A CN112099247A CN 112099247 A CN112099247 A CN 112099247A CN 202010967314 A CN202010967314 A CN 202010967314A CN 112099247 A CN112099247 A CN 112099247A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0126—Opto-optical modulation, i.e. control of one light beam by another light beam, not otherwise provided for in this subclass
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
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- H—ELECTRICITY
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- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
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- H01P1/20—Frequency-selective devices, e.g. filters
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Abstract
The invention provides an azobenzene doped liquid crystal material-based light-controlled dual-wavelength terahertz wave narrow-band filter and a filtering method thereof. The filter can quickly and efficiently tune the frequency of output laser, has high response speed, the line width can be as low as 10GHz, the terahertz wave transmittance reaches more than 90%, the filtering method adopts a light control method, the refractive index of a photonic crystal defect mode is changed, and a dual-wavelength narrow-band filter with the center frequency tunable to the wavelength near 1THz can be obtained.
Description
Technical Field
The invention relates to a light-operated dual-wavelength terahertz wave narrow-band filter based on an azobenzene-doped liquid crystal material and a filtering method thereof, and belongs to the technical field of terahertz wave filters.
Background
Terahertz (THz, otherwise known as T-ray) waves are electromagnetic radiation having a frequency between 0.1THz (1THz 1012Hz) and 10THz, corresponding to a wavelength range between 3000 μm and 30 μm. The electromagnetic wave in this range is between microwave and infrared light, and due to the lack of efficient terahertz light sources and detectors, the terahertz waveband becomes the last frequency range in the electromagnetic wave spectrum which is not studied comprehensively, and is called a terahertz gap. With the gradual maturity of terahertz radiation and detection modes, the application of terahertz waves draws extensive attention and is greatly developed. The terahertz technology can be applied to the fields of basic physical science, material science, cosmology, radio astronomy, biomedicine, high-speed communication, high-resolution imaging, safety monitoring, atmospheric remote sensing, plasma fusion diagnosis and heating, military and the like. In addition to terahertz sources and detectors, the development of terahertz technology requires devices to conduct and manipulate terahertz waves. Therefore, it is necessary to use high-performance terahertz devices including frequency filters, absorbers, beam splitters, polarizers, and the like.
The terahertz wave filter is a key terahertz wave functional device, and with the development of terahertz technology, the research of the terahertz wave filter has been a focus. The high-resolution terahertz wave imaging system requires a high-efficiency narrow-band terahertz wave filter, because if a high-quality filter is used, the noise bandwidth can be significantly reduced, and the dynamic range of the existing terahertz wave detector can be increased, thereby improving the imaging quality. With the gradual development of wireless mobile communication towards the directions of mobility, high-speed transmission and ultra-wideband transmission, the bandwidth requirement of a wireless communication system is rapidly increased, and one of the main development directions of the wireless communication in the future is the expansion of a terahertz wave frequency band; the larger the requirement on the bandwidth is, the higher the requirement on the carrier frequency is, and the terahertz wave can widen the network frequency band which can be used in the field of wireless communication, thereby laying a foundation for realizing a future high-speed wireless mobile network. In a future terahertz wave wireless communication system, with a rapid increase in wireless transmission rate, a terahertz wave filter is one of key functional devices of the terahertz wave communication system.
Disclosure of Invention
The invention aims to solve the technical problem of providing a light-operated dual-wavelength terahertz wave narrowband filter based on an azobenzene-doped liquid crystal material and a filtering method thereof aiming at the application requirements of the current terahertz wave to the dual-wavelength narrowband filter in the fields of wireless communication systems, imaging systems, radars, national defense safety and the like.
The scheme is realized by the following technical measures: the optical control dual-wavelength terahertz wave narrow-band filter based on the azobenzene doped liquid crystal material comprises a two-dimensional photonic crystal formed by arranging cylindrical dielectric column periodic lattices, wherein a waveguide region penetrates through the middle of the two-dimensional photonic crystal, a point defect resonant cavity is arranged in the middle of the waveguide region, the point defect resonant cavity is formed by arranging point defect columns and cylindrical dielectric columns at intervals, two ends of the waveguide region are a terahertz signal input end and a terahertz signal output end respectively, terahertz waves are input from the terahertz signal input end, sequentially pass through the waveguide region, the point defect resonant cavity and the waveguide region and are output from the terahertz signal output end; and controlling laser to be incident on the point defect resonant cavity and the point defect column along the direction vertical to the plane of the two-dimensional photonic crystal.
Preferably, the cylindrical dielectric column is a high-resistance silicon dielectric column.
Preferably, the lattice constant of the two-dimensional photonic crystal is 100 μm, the refractive index of the high-resistance silicon dielectric column in the terahertz waveband is 3.42, the radius of the high-resistance silicon dielectric column is 15-20 μm, and the length of the high-resistance silicon dielectric column is 1.6-1.8 mm.
Preferably, the point defect columns have a radius of 15 to 20 μm and a length of 1.6 to 1.8 mm.
Preferably, the point defect columns are filled with a mixture of a liquid crystal material and a small amount of an azobenzene material.
Preferably, the liquid crystal material is E7 liquid crystal.
Preferably, the terahertz wave is a broadband terahertz wave with a center frequency of 0.8-1.2THz, and the terahertz wave is a continuous terahertz wave or a pulse terahertz wave.
Preferably, the control laser is linearly polarized pump light, the wavelength of the control laser is 365nm-422nm, and the incident intensity of the control laser is>0.7mW/cm2The control laser is provided by a continuous laser, a nanosecond pulse laser, a picosecond pulse laser or a femtosecond pulse laser.
Preferably, the two-dimensional photonic crystal is of a rectangular, square, circular or polygonal structure.
The invention also provides a filtering method of the optically controlled dual-wavelength terahertz wave narrow-band filter based on the azobenzene-doped liquid crystal material, which comprises the optically controlled dual-wavelength terahertz wave narrow-band filter based on the azobenzene-doped liquid crystal material with at least one technical characteristic, wherein the filter realizes a filtering function by utilizing the dynamic change of the resonant frequency in the point defect resonant cavity 6; by changing the polarization direction of the control laser, the refractive index of the mixture of the liquid crystal material and a small amount of azobenzene material filled in the point defect column is rapidly changed, the frequency of a resonant cavity formed by point and line defects is further changed, and the filtering frequency of the filter is finally controlled.
The beneficial effects of the invention can be known from the description of the scheme, the optical control dual-wavelength terahertz wave narrow-band filter based on the azobenzene doped liquid crystal material can simultaneously realize the filtering of terahertz waves with two wavelengths near 1THz, the filter combines a line defect waveguide area and a point defect resonant cavity in a two-dimensional periodic lattice silicon dielectric cylindrical two-dimensional photonic crystal, wherein the waveguide area provides an effective transmission path of the terahertz waves in the two-dimensional photonic crystal, and the point defect resonant cavity filled with a mixture of the liquid crystal material and a small amount of azobenzene material is used for linear polarization laser, so that the frequency of the output laser can be quickly and efficiently tuned. The filter has the advantages of high response speed, nanosecond level, low line width (10 GHz), terahertz wave transmittance (more than 90%), compact structure, small size, small volume and convenience in manufacturing, and can meet the application requirements in the fields of terahertz wave imaging, medical diagnosis, terahertz wave communication systems and the like. The filter can flexibly change various parameters of the two-dimensional crystal, the types and sizes of point defect filled azobenzene and liquid crystal, the distribution of a waveguide area and the like, and can design the working wavelength, the double-wavelength tuning range and other performances. The filtering method can obtain lower transmission loss and narrower filtering line width, and can obtain filtering characteristics of multiple frequency bands by changing the polarization direction of the additional laser, thereby providing important guiding significance for terahertz imaging systems and wireless communication systems. Therefore, compared with the prior art, the invention has prominent substantive features and remarkable progress, and the beneficial effects of the implementation are also obvious.
Drawings
FIG. 1 is a schematic perspective view of a light-controlled dual-wavelength terahertz narrow-band filter based on an azobenzene-doped liquid crystal material according to the present invention;
FIG. 2 is a schematic diagram of a top-view structure of an azobenzene-doped liquid crystal material-based optically-controlled dual-wavelength terahertz narrow-band filter in the invention;
FIG. 3 is a graph of output power of a terahertz signal output end of a light-controlled dual-wavelength terahertz narrow-band filter based on an azobenzene-doped liquid crystal material according to the invention;
FIG. 4 is a steady-state field intensity distribution diagram of the optical control dual-wavelength terahertz wave narrow-band filter based on the azobenzene-doped liquid crystal material.
FIG. 5 is a steady-state field intensity distribution diagram of the optical control dual-wavelength terahertz wave narrow-band filter based on the azobenzene-doped liquid crystal material.
In the figure, 1-two-dimensional photonic crystal; a 2-terahertz signal input end; 3-a terahertz signal output end; 4-a waveguide region; 5-point defect pillars; a 6-point defect resonant cavity; 7-cylindrical dielectric column.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the following explains the present solution by way of specific embodiments and with reference to the accompanying drawings.
An azobenzene doped liquid crystal material-based optically-controlled dual-wavelength terahertz wave narrow-band filter is shown in the figure, and comprises a two-dimensional photonic crystal 1 formed by arranging a cylindrical dielectric column 7 periodic lattice, wherein the lattice constant of the two-dimensional photonic crystal 1 is 100 micrometers, and the two-dimensional photonic crystal 1 is of a rectangular, square, circular or polygonal structure along a y-z plane, for example, the two-dimensional photonic crystal 1 is of a rectangular structure with the thickness of 15mm multiplied by 11 mm. The cylindrical dielectric column 7 is a high-resistance silicon dielectric column, and the high-resistance silicon has extremely low loss in the terahertz frequency range. The refractive index of the high-resistance silicon dielectric columns in a terahertz wave band is 3.42, the high-resistance silicon dielectric columns are the same in size, the radius of each high-resistance silicon dielectric column is 15-20 mu m, the length of each high-resistance silicon dielectric column is 1.6-1.8mm, and the length of each high-resistance silicon dielectric column is preferably 1.7 mm. The middle of the two-dimensional photonic crystal 1 is provided with a waveguide region 4 in a penetrating manner, the waveguide region 4 is formed by a line defect introduced into the middle of the two-dimensional photonic crystal 1, namely a point defect resonant cavity 6 is arranged in the middle of the waveguide region 4, the point defect resonant cavity 6 is formed by alternately arranging point defect columns 5 and cylindrical dielectric columns 7, preferably, the point defect resonant cavity 6 is formed by alternately arranging two point defect columns 5 and three cylindrical dielectric columns 7, the radius of each point defect column 5 is 15-20 mu m, the length of each point defect column 5 is 1.6-1.8mm, the length of each point defect column 5 is preferably 1.7mm, and the point defect columns 5 are filled with a mixture of a liquid crystal material and a small amount of azobenzene material, and the two materials are easy to obtain and have high dielectric constants, so that coupling between terahertz waves and the point defect resonant cavity 6 can be realized. Preferably, the liquid crystal material is E7 liquid crystal, and the E7 liquid crystal has small loss (kappa <0.05) in the terahertz waveband.
The terahertz wave generation device is characterized in that a terahertz signal input end 2 and a terahertz signal output end 3 are respectively arranged at two ends of the waveguide area 4, the terahertz wave is a broadband terahertz wave with the central frequency of 0.8-1.2THz, preferably the terahertz wave is a broadband terahertz wave with the central frequency of 1THz, the terahertz wave is a continuous terahertz wave or a pulse terahertz wave, and the terahertz wave is generated by an optical method and comprises methods of generating the terahertz wave by difference frequency, generating terahertz parametric oscillation, rectifying light and the like. Terahertz waves are input from a terahertz signal input end 2, filtered by a waveguide region 4, a point defect resonant cavity 6 and the waveguide region 4 in sequence and output from a terahertz signal output end 3; controlling laser to be incident on a point defect resonant cavity 6 and a point defect column 5 along the direction (the direction parallel to the x axis) vertical to the plane (y-z plane) of the two-dimensional photonic crystal 1, wherein the control laser is linearly polarized pump light, the wavelength of the control laser is 365nm-422nm, and the incident intensity of the control laser is>0.7mW/cm2The control laser is provided by a continuous laser, a nanosecond pulse laser, a picosecond pulse laser or a femtosecond pulse laser.
The invention also provides a filtering method of the optically controlled dual-wavelength terahertz wave narrow-band filter based on the azobenzene-doped liquid crystal material, which comprises the optically controlled dual-wavelength terahertz wave narrow-band filter based on the azobenzene-doped liquid crystal material with at least one technical characteristic, wherein the filter realizes a filtering function by utilizing the dynamic change of the resonant frequency in the point defect resonant cavity 6; by changing the polarization direction of the control laser, the refractive index of the mixture of the liquid crystal material and a small amount of azobenzene material filled in the point defect column 5 is rapidly changed, the frequency of the resonant cavity formed by the point and line defects is further changed, and finally the filtering frequency of the filter is controlled.
The filtering method of the present invention is described below with specific embodiments:
the lattice constant of the two-dimensional photonic crystal 1 is 100 μm, the radius of the high-resistance silicon dielectric column is 20 μm, and the refractive index of the high-resistance silicon dielectric column is 3.42. The length of the high-resistance silicon medium column and the point defect column 5 is 1.7 mm. The filling material of the point defect column 5 is E7 liquid crystal doped with a small amount of azobenzene material, and the E7 liquid crystal has small loss (kappa) in the terahertz waveband<0.05), the radii of the point defect columns 5 were selected to be 15 μm and 20 μm, respectively. The point defect resonant cavity 6 and the point defect column 5 are irradiated by the linearly polarized pump light with the wavelength of 365nm and 422nm respectively, and the incident intensity of the linearly polarized pump light is>0.7mW/cm2And the polarization direction of control laser (linear polarization pump light) is changed, and due to the cis-trans isomorphic process of the azobenzene material, the refractive index of the E7 liquid crystal can be changed between 1.57 and 1.75, so that the frequency of the resonant cavity is changed, and the filter is further enabled to output terahertz waves with different frequencies. In the filtering method, irradiation of control laser with certain intensity is used, and the response time of cis-trans isomerization reaction of azobenzene molecules is in nanosecond order (about 200ns) and is far less than the response speed of an electric field in a common liquid crystal box. By using different laser irradiation, the output power diagram of the terahertz signal output end of the optical control dual-wavelength terahertz wave narrow-band filter based on azobenzene doped liquid crystal material shown in fig. 3 is obtained, and as known from fig. 3, when the radius of two point defect columns 5 is 20 μm, the obtained dual-wavelength tuning ranges are 1.0095THz-1.0365THz and 1.0565THz-1.0845THz respectively by using different linear polarization pump light irradiation. When the radii of the two point defect columns 5 were set to 15 μm, irradiation with different linearly polarized pump light resulted in the two wavelength tuning ranges of 1.0445THz-1.0654THz and 1.0945THz-1.1135THz, respectively. The optical control dual-wavelength terahertz wave narrow-band filter based on the azobenzene doped liquid crystal material has the filter line width of 10GHz and the transmittance of more than 90%.
Fig. 4 and 5 are steady state field intensity distribution diagrams of the filter of the present invention at THz frequencies of 1.0445THz and 1.0945THz, respectively, from which it can be seen that the two THz frequencies enable low power loss and high transmittance transmission along the point defect resonator 6.
In the invention, the traditional scheme of designing a photonic crystal column by adopting a metal material in the prior art is abandoned, and the light-controlled dual-wavelength terahertz wave narrow-band filter is designed by skillfully selecting a mode of combining high-resistance silicon and liquid crystal point defects doped with a small amount of azobenzene material, so that the filtering characteristics of multiple frequency bands can be obtained by changing the polarization direction of externally-controlled laser while the lower transmission loss and the narrower filtering line width are obtained, and the important guiding significance is provided for a terahertz imaging system and a wireless communication system.
Technical features not described in the present invention can be implemented by the prior art, and are not described in detail herein. The present invention is not limited to the above-described embodiments, and variations, modifications, additions and substitutions which are within the spirit of the invention and the scope of the invention may be made by those of ordinary skill in the art are also within the scope of the invention.
Claims (10)
1. The optical control dual-wavelength terahertz wave narrow-band filter based on the azobenzene-doped liquid crystal material is characterized in that: the terahertz wave detector comprises a two-dimensional photonic crystal formed by arranging cylindrical dielectric columns in a periodic lattice mode, wherein a waveguide region penetrates through the middle of the two-dimensional photonic crystal, a point defect resonant cavity is arranged in the middle of the waveguide region and is formed by arranging point defect columns and cylindrical dielectric columns at intervals, a terahertz signal input end and a terahertz signal output end are respectively arranged at two ends of the waveguide region, and terahertz waves are input from the terahertz signal input end, sequentially pass through the waveguide region, the point defect resonant cavity and the waveguide region and are output from the terahertz signal output end; and controlling laser to be incident on the point defect resonant cavity and the point defect column along the direction vertical to the plane of the two-dimensional photonic crystal.
2. The optically controlled dual-wavelength terahertz wave narrow-band filter based on the azobenzene-doped liquid crystal material as claimed in claim 1, wherein: the cylindrical dielectric column is a high-resistance silicon dielectric column.
3. The optically controlled dual-wavelength terahertz wave narrow-band filter based on the azobenzene-doped liquid crystal material as claimed in claim 1 or 2, which is characterized in that: the lattice constant of the two-dimensional photonic crystal is 100 micrometers, the refractive index of the high-resistance silicon dielectric column in a terahertz wave band is 3.42, the radius of the high-resistance silicon dielectric column is 15-20 micrometers, and the length of the high-resistance silicon dielectric column is 1.6-1.8 mm.
4. The optically controlled dual-wavelength terahertz wave narrow-band filter based on the azobenzene-doped liquid crystal material as claimed in claim 3, wherein: the radius of the point defect column is 15-20 μm, and the length is 1.6-1.8 mm.
5. The optically controlled dual-wavelength terahertz wave narrow-band filter based on the azobenzene-doped liquid crystal material as claimed in claim 4, wherein: and the point defect column is filled with a mixture of a liquid crystal material and a small amount of azobenzene material.
6. The optically controlled dual-wavelength terahertz wave narrow-band filter based on the azobenzene-doped liquid crystal material as claimed in claim 5, wherein: the liquid crystal material is E7 liquid crystal.
7. The optically controlled dual-wavelength terahertz wave narrow-band filter based on the azobenzene-doped liquid crystal material as claimed in claim 6, wherein: the terahertz wave is a broadband terahertz wave with the center frequency of 0.8-1.2THz, and the terahertz wave is a continuous terahertz wave or a pulse terahertz wave.
8. The optically controlled dual-wavelength terahertz wave narrow-band filter based on the azobenzene-doped liquid crystal material as claimed in claim 7, wherein: the control laser is linearly polarized pump light, the wavelength of the control laser is 365nm-422nm, and the incident intensity of the control laser is>0.7mW/cm2The control laser is provided by a continuous laser, a nanosecond pulse laser, a picosecond pulse laser or a femtosecond pulse laser.
9. The optically controlled dual-wavelength terahertz wave narrow-band filter based on the azobenzene-doped liquid crystal material as claimed in claim 8, wherein: the two-dimensional photonic crystal is of a rectangular, square, circular or polygonal structure.
10. The filtering method of the optical control dual-wavelength terahertz wave narrow-band filter based on the azobenzene-doped liquid crystal material is characterized by comprising the following steps of: the optical control dual-wavelength terahertz wave narrow-band filter comprises the optical control dual-wavelength terahertz wave narrow-band filter based on the azobenzene-doped liquid crystal material, which is disclosed by any one of claims 1 to 9, and the filter realizes a filtering function by utilizing the dynamic change of the resonant frequency in the point defect resonant cavity 6; by changing the polarization direction of the control laser, the refractive index of the mixture of the liquid crystal material and a small amount of azobenzene material filled in the point defect column is rapidly changed, the frequency of a resonant cavity formed by point and line defects is further changed, and the filtering frequency of the filter is finally controlled.
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| CN114843724A (en) * | 2021-02-02 | 2022-08-02 | 中国科学院上海微系统与信息技术研究所 | Photonic crystal double-band-pass filter |
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