83 results about "Tm waves" patented technology

An optical transmitter splits a linear polarization optical carrier into a TE wave and a TM wave. One of the TE wave and the TM wave is phase-modulated with a transmission data so as to generate a phase-modulated signal. The phase-modulated signal and the other one of the TE wave and the TM wave are coupled with a linear polarization and output into an optical transmission line. An optical receiver splits a light input from the optical transmission line into the TE wave and the TM wave. The TM wave or TE wave is converted into the TE wave or TM wave to interfere with the TE wave or TM wave. The interfered signal light is converted into an electric signal for restoration of the data.

An attenuation device for use under a radome disposed on a mobile platform such as an aircraft for reflecting a portion of the electromagnetic energy radiated by an antenna disposed under the radome such that the reflected portion of energy impinges the radome at an angle normal thereto, thereby reducing or eliminating further reflections of the reflected portion of energy within the radome toward the mobile platform. In one embodiment the radome includes a base covered with a radar absorbing material (RAM). In another embodiment the radome includes a curved base adapted to match the mobile platform surface curvature on which the attenuation apparatus is mounted. In a further embodiment, RAM is disposed on an exterior surface of the mobile platform under the radome. In still another embodiment, the base is formed of an attenuating transverse magnetic TM wave corrugated plate.

The invention provides a small optical device with which incident light can be demultiplexed. The optical device includes a demultiplexing portion 4 (first optical member) separating TE waves and TM waves of incident light of a wavelength lambd and an optical fiber 1 (optical input portion) inputting incident light into the demultiplexing portion 4. The demultiplexing portion 4 has a periodically changing refractive index. The angle defined by the first reciprocal lattice vector alpha1 and the second reciprocal lattice vector alpha2 of the demultiplexing portion 4 at the wavelength lambd is not greater than 90°. In the direction of the first reciprocal lattice vector alpha1 the wave number of the TE wave is larger than the wave number of the TM wave. In the direction of the second reciprocal lattice vector alpha2 the wave number of the TE wave is smaller than the wave number of the TM wave. The optical fiber 1 inputs the incident light in a direction that is parallel to a plane including the first reciprocal lattice vector alpha1 and the second reciprocal lattice vector alpha2.

A system and method for measuring interferences are disclosed. The system is based on the concept of a composite interferometer. The sample is measured while a simultaneous compensation of the phase deviation due to the relative displacement of the optical delay component between the measurements at different pixels of the sample is performed. In the application of profilometry, the information of the surface profile of a material is obtained from the phase shift of the interference signal. By using the proposed compensation mechanism, an axial resolution at nanometer scale can be achieved. For the measurement of a thin film, a polarized probe beam is oblique incident on the sample. The system can perform a simultaneous measurement of the refractive index and the thickness of the thin film. From the ratio of the intensities of the interferograms of TE and TM waves as well as the phase shifts of the interferograms, the refractive index and the thickness of the thin film can then be obtained simultaneously.

Provided is an image display device that attains see-through characteristics and visual perceptibility with a simple structure.An image display device includes a frame, a signal generation unit (light source unit) that generates signal light L1 that is a TE wave, a scan light emission unit that is provided with a light scan unit 42 (light scanner) that scans the signal light L1, a reflection unit 6 (reflecting optical unit) that reflects the signal light L1 scanned by the light scan unit 42; a diffracting optical unit 9 that includes a pair of diffraction gratings whose grating patterns are equivalent to each other and diffracts the signal light L1 reflected at the reflection unit 6; and a polarizing plate 8 (polarization selection unit) that is located at an opposite side in relation to the diffracting optical unit 9 with respect to the reflection unit 6 and allows outside-world light L2 that is a TM wave to pass toward the reflection unit 6, wherein the diffracting optical unit 9 diffracts the signal light L1 and does not diffract the outside-world light L2. The signal light L1 is split into plural beams at the diffracting optical unit 9 to enter the eye EY of a user.

A high-resolution microscopic three-dimensional imaging device is characterized by the following steps: first determine the incident light, then select a suitable hemispherical prism, select a slide glass and vapor-deposit a layer of metal on its surface, and place it on the hemispherical plane of the hemispherical prism , put the object on the metal layer, let the incident light be incident on a point on the prism hemispherical surface along the radial direction of the prism, the angle between the incident light and the plane of the glass slide is θ, and the light beam will produce total reflection on the surface of the slide, TM The wave generates surface plasma waves on the metal surface through total reflection, and the TE wave is reflected. A λ / 4 wave plate and a mirror are placed on the reflected light path outside the hemispherical prism; the detector is placed above the object to detect and record Detection results; by changing the incident surface and the included angle θ, illuminating the object at different positions and recording the detection results, and considering all the detection results comprehensively, the complete three-dimensional information of the detected object can be obtained; this method can effectively use the lighting light, the device is flexible, and the imaging resolution is high.

The invention provides an intermediate infrared 10.6-micrometer narrow bandwidth angle wave-absorbing material, and discloses a metamaterial wave-absorbing material based on a plane two dimensional photonic crystal structure. The wave-absorbing material comprises three layers, wherein the first layer is a cross-shaped metal tungsten patch periodic array, the second layer is a medium layer, and the third layer is a metal reflection layer. By means of optimization of structural parameters, the wave-absorbing material has relatively ideal absorbing effects around 10.6 micrometers, the absorption rate of the wave-absorbing material can achieve more than 98% for TE waves with incident angles ranging from 0 degree to 40 degrees, and the absorption rate of the wave-absorbing material can achieve more than 98% for TM waves with incident angles ranging from 0 degree to 80 degrees.

The invention provides a reflection beam deviation-based terahertz polarization separator, and relates to a terahertz reflection polarization isolation device. The reflection beam deviation-based terahertz polarization separator comprises a metal bottom plate, a dielectric substrate and metal patch arrays in an amount of four by four, wherein the dielectric substrate is arranged on the metal bottom plate, the metal patch arrays are arranged on the dielectric substrate, the reflection beam deviation-based terahertz polarization separator is characterized in that each metal patch comprises an orthogonal cross part and four rectangular short metal strips, the four rectangular short metal strips are respectively arranged at four end points of the cross shape in an orthogonal mode, the metal patches are in vertical symmetry and horizontal symmetry, middle points of the four short metal strips are arranged at two symmetric shafts of the orthogonal cross shape, the TM wave phase difference between adjacent metal substrates is 90 degrees along a traverse direction by taking a metal patch arranged at a top angle of the array as a base point, and the TE wave phase difference between adjacentmetal substrates is 90 degrees along a longitudinal direction. By the reflection beam deviation-based terahertz polarization separator, modulation of a TE wave and a TM wave in different directions is achieved.

The invention discloses a terahertz wave polarization beam splitter based on multiple dielectric cylinder structures. The terahertz wave polarization beam splitter comprises first dielectric cylinder photonic crystal and second dielectric cylinder photonic crystal which are arranged in a two-dimensional period, and a signal input end, a first signal output end, a second signal output end, a first elliptical photonic crystal dielectric cylinder array, a second elliptical photonic crystal dielectric cylinder array, a first coupling photonic crystal dielectric cylinder, a second coupling photonic crystal dielectric cylinder, a first photonic crystal array, a second photonic crystal array, a third photonic crystal array and a fourth photonic crystal array which are arranged between the first dielectric cylinder photonic crystal and the second dielectric cylinder photonic crystal. Signals are inputted from the signal input end. The first signal output end outputs TM wave, and the second signal output end outputs TE wave so that polarization beam splitting performance is acquired. The terahertz wave polarization beam splitter based on the multiple dielectric cylinder structures has advantages of being simple in structure, adjustable, high in beam splitting rate, small in size, low in cost and easy to integrate.

The present invention discloses a TE-polarization splitter based on a photonic crystal waveguide, comprising a waveguide formed in a photonic crystal with a complete photonic bandgap, wherein after the incident wave with any polarization direction is inputted into the polarization splitter via the input port of the photonic crystal waveguide. TE wave is outputted from the output port of the polarization splitter, while the TM wave is reflected from the input port of the polarization splitter. The structure of the present invention has a small volume, high degree of polarization, high light transmission efficiency, and it is suitable for large-scale optical integrated circuits and can realize the polarization beam splitting function for different wavelengths.

The invention discloses a polarization white light LED based on fluorescent ceramic and a double-layer nanometer grating structure. A working wave band is modulated according to a structure parameter, wherein an extinction ratio is higher than 20dB and TM wave transmittance is higher than 60% in a visible light range of 450nm-650nm. According to the polarization white light LED, a low-refractivity transition layer is introduced on the surface of a fluorescent ceramic substrate. The transition layer improves effect of the device and furthermore prevents metal etching, so that higher convenience and higher speed in a manufacture process. Furthermore a composite structure which comprises a dielectric grating and double-layer metal is integrated on the surface of the transition layer. The composite structure is coupled with blue light GaN-based LED, and polarization white light emission is finally realized. The transition layer and a dielectric layer grating are made from semiconductor materials of magnesium fluoride, silicon dioxide, PMMA, etc. The nanometer grating is made from metal materials of aluminum, silver, gold, etc.

The invention discloses a broadband micro nano two-dimensional multitooth grating trap filter, for the purpose of improving the photoelectric conversion efficiency of a silicon solar film battery. The structure is as follows: gratings periodically changing along two directions are arranged at the upper surface of a silicon active layer, each of the gratings in the two directions has two teeth, and the teeth are non-uniformly distributed in the two directions of the gratings. According to the invention, through adjusting structural dimensions of the micro nano two-dimensional multitooth gratings and positions of the grating teeth, by use of a leaky-mode resonance effect, the device has the advantages of high transmission efficiency, large bandwidth and wide angle spectrum for transverse electric wave (TE wave) and transverse magnetic wave (TM wave) incident light.

The invention relates to a quartz transmission polarization beam splitting grating for a rectangular groove. The grating comprises a fused quartz rectangular groove grating and a porous silica anti-reflection film on the surface thereof. The grating has two polarization ways: the first polarization way is to inflect TM wave to zero level and inflect TE wave to -1 level, wherein the variation range of normalization period rho, namely a rate of grating period to the incidence wave length, is 0.582 to 0.854, and the second polarization way is to inflect TM wave to -1 level and inflect TE wave to zero level, wherein the variation range of normalization period rho is 0.624 to 1.049. The diffraction efficiencies of the TE and TM waves of the quartz transmission polarization beam splitting grating for a rectangular groove of the invention can reach to 99% and the use wavelength range is wider.

The inventiondiscloses an infrared polarizer with a metal-medium-metal three-layer wire gating structure. The infrared polarizer comprises a transparent substrate, a metal wire gating layer, a dielectricwire gating layer and a metal wire gating layer from bottom to top, wherein the substrate is a medium-wave infrared bandtransparent materialsapphire, the refractive index of the dielectricwire gating layer is in a range of 1.3-4.0, a metal wire gating and a dielectricwire gating have the same cycle and duty ratio, the cycle is in a range of 300-600 mm, and the duty ratio is in a range of 0.4-0.7. In the medium-wave infrared band, when incident light is matched with impedance of the polarizer with the metal-medium-metal three-layer wire gating structure, the incident light is coupled with the wire gating to stimulate magnetic local resonance, TM wave transmittance has a peak value, meanwhile, TE wave transmittance is obviously reduced, the extinction ratio of the wire grating is increased, and the polarization property is improved. The sub-wavelength metal wire grating polarizer has the advantages of flexible design, compact structure, easiness in integration, wider spectrum and field range and the like, and has great application prospects in the aspects of micro-nano devices, integrated optics and the like.

A polarization beam splitter comprises an SOI substrate layer and a waveguide layer; the SOI substrate layer comprises a bottom Si material layer and a silicon dioxide landfill layer manufactured on the bottom Si material layer; the waveguide layer is manufactured over the silicon dioxide landfill layer and comprises an input waveguide, a TM mode coupling waveguide and a TE mode coupling waveguide; the input waveguide comprises a bottom layer waveguide and a dielectric cover layer; and the waveguide layer is used for limiting a TE wave and a TM wave in a TE mode coupling waveguide and a TM mode coupling waveguide respectively so as to separate light in different polarization modes in the input waveguide. The waveguide layer of a three-waveguide structure is adopted and comprises the inputwaveguide, the TM coupling waveguide and the TE coupling waveguide, the TE mode and the TM mode are limited in the waveguides on the two sides respectively, so that different polarization states in the input waveguide are coupled respectively, and influence of a residual mode of the input waveguide on the performance of the device is eliminated.

The invention provides a broadband metamaterial terahertz microwave absorber based on an optical control switch, comprising an underlayer metal reflective plate and a dielectric substrate above the underlayer metal reflective plate, wherein the dielectric substrate is covered with periodic structural units, the periodic structural units are composed of a light-controlled semiconductor silicon patch and a metal patch, and comprise a double-arm spiral structure located in the center of the dielectric substrate and a double-Y-shaped strip structure uniformly and symmetrically distributed along the periphery of the dielectric substrate. The absorber has good absorbing effect under TE wave and TM wave. Different conductivity represents different level of light excitation, so the absorbing effect can be adjusted effectively by adjusting the conductivity of surface photo-controlled semiconductor silicon, so that the absorbing frequency domain with the absorbing rate above 90% can cover almostthe whole THz band. The invention also has the characteristics of simple structure, strong functionality, extremely wide absorption bandwidth and the like.

The invention discloses a wave-absorbing material. The wave-absorbing material comprises a copper metal back plate and a conductive composite material arranged on the copper metal back plate; the conductive composite material is compounded by a regular hexagonal honeycomb structure and a resistor sheet and is arranged on the copper metal back plate in an ordered manner. The preparation method comprises the steps of 1) preparing the resistor sheet and a PLA material regular hexagonal honeycomb structure; 2) performing compounding of the resistor sheet and the regular hexagonal honeycomb structure; and 3) enabling the composite material to be compounded with the copper metal back plate. By virtue of the composite type ultra-wide-band wave-absorbing material processed in the invention, the wave-absorbing performance of oblique incidence TM wave can be improved, and meanwhile, the mechanical performance of the wave-absorbing material can be reinforced.

The invention discloses a TeraHertz wave polarization beam splitter of a periodically staggered rectangular structure. The TeraHertz wave polarization beam splitter of the periodically staggered rectangular structure comprises a metal conveying layer of an staggered rectangular structure, a substrate, a reflecting metal plate, a signal input end, a first signal output end and a second signal output end, wherein the metal conveying layer of the staggered rectangular structure is connected with the substrate, the substrate is connected with the metal reflecting plate, the metal conveying layer of the staggered rectangular structure comprises 100*100 staggered rectangular metal units, signals are input from the signal input end, sequentially pass through the metal conveying layer of the staggered rectangular structure and the substrate, reach the metal reflecting plate and are reflected by the metal reflecting plate towards two directions, the first signal output end outputs TE waves, and the second signal output end outputs TM waves. The TeraHertz wave polarization beam splitter of the periodically staggered rectangular structure has the advantages of being simple and compact in structure, high in beam splitting efficiency and convenient to manufacture , saving materials and the like, meets the application requirements of the TeraHertz technology in the future, and has indispensable significance in facilitating the research of TeraHertz functional devices.

The invention discloses a transmission-type polarization aberration compensation device based on light-splitting polarization modulation, and belongs to the technical field of polarization optics, and aims at solving a problem that a conventional polarization compensation device is poor in universality and is low in precision. The device is inputted into parallel optical paths of an optical system, and parallel incident light beams pass through a polarization beam splitter to be divided into a TM wave and a TE wave. The two light branches respectively pass through a transmission-type pure-phase liquid crystal spatial light modulator and a transmission-type pure-amplitude liquid crystal spatial light modulator: one light branches enters the transmission-type pure-phase liquid crystal spatial light modulator, and the transmission-type pure-phase liquid crystal spatial light modulator carries out the phase modulation of the light branch; the other light branch enters the transmission-type pure-amplitude liquid crystal spatial light modulator, and the transmission-type pure-amplitude liquid crystal spatial light modulator carries out the amplitude modulation of the light branch. Then, the two light branches are reflected by a first reflector and a second reflector to a depolarization beam splitter in a mutually perpendicular manner, and the depolarization beam splitter allows the light to come out after combination. The device is simple in structure, and facilitates the improvement of compensation precision.

The invention belongs to the technical field of stealth materials, and relates to a three-dimensional reconfigurable broadband wide-angular-domain wave-absorbing material based on Miura origami. The material comprises an origami structure, a substrate layer and a metal back plate which are sequentially arranged in the electromagnetic propagation direction, and the origami structure comprises a reconfigurable substrate and a metamaterial structure unit printed on the reconfigurable substrate. According to the three-dimensional reconfigurable broadband wide-angular-domain wave-absorbing material based on the Miura origami of the invention, the wave-absorbing material can be dynamically adjusted, and ultra-wideband absorption of TM waves is realized by optimizing the structural design; and meanwhile, the reconfigurable wave-absorbing material has good oblique incidence performance and a wide angular domain. With continuous development of shape memory alloy, 4D printing, origami and other micro-manufacturing technologies, the material has a wider application space in manufacturing reconfigurable devices.

The invention discloses a terahertz wave polarization beam splitter of a silicon array structure. The beam splitter comprises a substrate layer, a central rectangular silicon waveguide, a first long rectangular silicon waveguide on the left, a second long rectangular silicon waveguide on the left, a third long rectangular silicon waveguide on the left, a first short rectangular silicon waveguide in the middle, a second short rectangular silicon waveguide in the middle, a third short rectangular silicon waveguide in the middle, a first long rectangular silicon waveguide in a lower portion, a second long rectangular silicon waveguide in the lower portion, a first long rectangular silicon waveguide in the right, an inverted L-shaped silicon waveguide, a second long rectangular silicon waveguide in the right, a L-shaped silicon waveguide, a signal input terminal, a first signal output terminal and a second signal output terminal. A signal is input from a signal input terminal. The first signal output terminal outputs a TE wave and the second signal output terminal outputs a TM wave so as to acquire polarization and beam splitting performance. The beam splitter possesses advantages that the structure is simple; a beam splitting rate is high; the size is small; cost is low; and integration is easy to perform and so on.

The invention relates to a multifunctional wave beam compiler based on a plasma meta-material, and the structure comprises a reflecting plate, a dielectric substrate disposed above the reflecting plate, and a solid plasma resonant unit on the dielectric substrate, wherein the solid plasma resonant unit is provided with a lumped resistor. A solid plasma is implemented through an array formed by PINunits, and the PIN units are isolated by an isolating layer. The excitation is controlled through programmable logic arrays loaded at two ends of the PIN units. The compiler achieves the good absorption of TE waves and TM waves. The compiler can achieve the excitation of different resonant units when an excitation area of the resonant unit formed by the solid plasma is controlled in a programmable mode. The compiler also can achieve the UWB (ultra wide band) absorption of electromagnetic waves, and achieves the compiling of a spatial beam. The compiler also can achieve the absorption of the electromagnetic waves at lower frequencies in a smaller physical dimension, and achieves the compiling of the spatial beam through the excitation of different plasma areas.

The invention discloses a terahertz reflector based on a silicon meta-surface, and relates to an optical element. The reflector consists of medium blocks and a silicon dioxide substrate, and the medium blocks are cubic medium blocks and are arranged periodically, wherein the sizes of all medium blocks are the same. The width of each medium block is 170 microns, and the period is 240 microns. The working principle is that an incident wave excites a dielectric medium to perform Mie resonance to arouse the strong coupling effect of an electric field, thereby achieving the broadband total reflection. The reflector is not sensitive to polarization, and the incidence of TE and TM waves can achieve the same total reflection effect. Moreover, the reflector can be adjusted through the changing of the geometric size, and achieves the total reflection of incident waves through the control of the propagation of electromagnetic waves. The reflector is simple in structure, is wide in application range, is not sensitive to the polarization mode of incident waves, and is high in application value for the design of a photoelectric device.

The invention discloses a terahertz wave polarization beam splitter with trapezoidal structures loaded on the borders. The terahertz wave polarization beam splitter comprises a signal input terminal, a first signal output terminal, a second signal output terminal, a far infrared quartz glass matrix and a polarization beam splitting piece; the polarization beam splitting piece is arranged on the far infrared quartz glass matrix; the polarization beam splitting piece comprises a left side narrow rectangular polarization silicon waveguide, a right side wide rectangular polarization silicon waveguide, an upper side rectangular polarization silicon waveguide, a lower side rectangular polarization silicon waveguide, a long trapezoidal polarization silicon waveguide and a short trapezoidal polarization silicon waveguide; signals are vertically emitted from the signal input terminal and pass through the polarization beam splitting piece; the first signal output terminal outputs TE waves; and the second signal output terminal outputs TM waves, so that polarization beam splitting performance is obtained. The terahertz wave polarization beam splitter has the advantages of simple structure, high beam splitting rate, small dimension, low cost, convenience in manufacture and the like.

A wide-angle wave absorbing structure design method based on additive manufacturing comprises the steps that a structure is divided into multiple layers according to the appearance and size of a stealth target, multiple layers of unit cell structures are selected, and the unit cell structures are periodically arrayed to form a multilayer structure; then multilayer oblique incidence impedance matching design is performed on the TE wave and the TM wave, an electromagnetic wave propagation path is designed and planned in the multilayer structure, and multilayer equivalent electromagnetic parameters are calculated; the design and control of the equivalent electromagnetic parameters are realized by controlling the variety and the proportion of an absorbent in a composite material and controlling the structural parameters of the unit cells; optimization is performed to obtain the types and proportions of the multilayer materials and the structural parameters of the unit cells; and modeling is performed, the reflection loss is calculated through simulation or the reflection loss is actually measured through 3D printing, and whether the design requirements are met or not is verified. According to the invention, the function of absorbing large electromagnetic waves with wide incident angles is realized, and the absorption angle can be actively designed, regulated and controlled.

The invention relates to an annular radial line aluminum metal polarization transmission grating which is manufactured by using the technologies of nano imprint lithography, reactive ion beam etching, physical sputtering and the like. The period of the grating is less than or equal to 200 nm. A significant polarization beam splitting effect is produced on a linearly polarized light whose wavelength is three times more than the period, namely the transmission of a TE wave whose electric field direction is parallel to a grid bar cannot be realized, while a TM wave whose electric field direction is perpendicular to the grid bar can be realized. The linearly polarized light which transmits the grating forms a light spot which has a fixed shape and synchronously rotates with a polarization plane. The power of the light after transmission does not change. The annular radial line aluminum metal polarization transmission grating can be used for the linear measurement of the optical rotation angle of the polarized light, and belongs to the technical field of applied optics.

The invention discloses a button-shaped terahertz wave polarization converter. The button-shaped terahertz wave polarization converter comprises a signal input end, a signal output end, a button-shaped structure transmission layer, a matrix and a metal level structure, wherein the button-shaped structure transmission layer is connected with the matrix, and comprises 9 button-shaped metal period units; each button-shaped metal period unit includes a first quarter circular metal structure, a second quarter circular metal structure, a third quarter circular metal structure, a fourth quarter circular metal structure and a double-opening circular ring structure; when a signal is input from the signal input end, and successively passes the button-shaped structure transmission layer and the matrix, and then is output through the metal layer structure; when the input signal is a TE wave, the signal output end outputs a TM wave; when the input signal is a TM wave, the signal output end outputs a TE wave, so that the polarization transition function can be realized; and the button-shaped structure transmission layer realizes conversion of the polarization mode. The button-shaped terahertz wave polarization converter has the advantages of being simple and compact in structure, being small in size, being high in beam splitting rate, being convenient for processing, and the like.