49 results about "Elliptically polarized light" patented technology

The invention discloses a grating displacement encoder grating spacing error in-situ detection and self-compensation method, and belongs to the technical field of optical measurement, and the method comprises the steps: generating elliptically polarized light, modulating the elliptically polarized light into S polarized light, reflecting the S polarized light through a polarization beam splitter, converting the S polarized light into circularly polarized light through a quarter-wave plate, and enabling the circularly polarized light to enter a diffraction grating ruler; the diffraction grating ruler diffracts incident light to form first-order diffraction light and second-order diffraction light; processing and interference detection are carried out on the first-order diffraction light, and precise displacement conversion is carried out in combination with the Doppler effect of grating displacement; constructing an auto-collimation angle detection sensing module by using second-order diffraction light, and converting the distance manufacturing deviation of diffraction gratings by detecting the tiny change of a diffraction angle; and compensating the displacement measurement error of the grating encoder in real time according to the real-time detection result of the grating spacing manufacturing deviation. According to the invention, the off-line detection time and cost of the grating are greatly saved.

The invention relates to the technical field of optical element surface shape dynamic measurement scheme design, in particular to an element surface shape dynamic measurement system based on a metasurface. According to the scheme, polarized light emitted by a laser is split into reference light and test light, the test light passes through a quarter-wave plate twice to realize polarization orthogonalization, and the test light is combined with the reference light to form elliptically polarized light; synchronously capturing component intensities of left-handed / right-handed circular polarized light and orthogonal line polarized light by using a detector, and resolving a phase difference delta in real time by combining a Stokes parameter; environmental interference is eliminated based on a common-path design, a polarization beam-splitting element is omitted, and the architecture is simplified; accurate dynamic measurement of the surface shape of the measured piece is realized by deducting the inherent surface shape error of the system. The system provided by the invention has the advantages of strong anti-interference performance, high measurement efficiency, remarkable cost reduction and the like, and is suitable for precise optical manufacturing and on-line detection scenes.

The present invention provides a distance calculation device that can calculate distance information relating to the distance a workpiece travels. [Solution] The system comprises a light source 10 that emits light, a first optical system 20 that converts the light from the light source into elliptical polarization and emits it toward a workpiece W1 that is transparent and moving in a specific direction, a second optical system 30 that converts the light from the workpiece into linear polarization and emits it, and an optical sensor 40 that acquires optical information of the workpiece based on the light from the second optical system. The first optical system includes a first polarizing filter 22 that converts to linear polarization and a first waveplate 23 that converts the linear polarization from the first polarizing filter into elliptical polarization. The second optical system 30 includes a second waveplate 31 that converts the light from the workpiece and a second polarizing filter 32 that is placed between the second waveplate and the optical sensor 40 and converts the light from the second waveplate into linear polarization.

A stereoscopic display device (100) includes a first image display section (110) that outputs first image light (151) of linearly polarized light, a second image display section (120) that outputs second image light (152) of linearly polarized light, a first phase difference plate (112) that modulates the first image light (151) output from the first image display section (110) to convert it into first elliptically polarized light, a second phase difference plate (122) that modulates the second image light (152) output from the second image display section (120) to convert it into second elliptically polarized light that rotates in the same direction as the first elliptically polarized light, and a half mirror (130) that transmits the first elliptically polarized light to make it first circularly polarized light that rotates in the same direction as the first elliptically polarized light, and reflects the second elliptically polarized light to make it second circularly polarized light that rotates in the opposite direction to the second elliptically polarized light.

A three-dimensional display device includes: a first image display that outputs linearly polarized first image light; a second image display that outputs linearly polarized second image light; a first retardation plate that modulates and converts the first image light output from the first image display to first elliptically polarized light; a second retardation plate that modulates and converts the second image light output from the second image display to second elliptically polarized light that rotates in a direction identical to a rotation direction of the first elliptically polarized light; and a half mirror that transmits the first elliptically polarized light, converts the first elliptically polarized light to first circularly polarized light that rotates in a direction identical to the rotation direction of the first elliptically polarized light, reflects the second elliptically polarized light, and converts the second elliptically polarized light to second circularly polarized light that rotates in a direction opposite the rotation direction of the second elliptically polarized light.

The invention relates to an assembly error elimination method for a liquid crystal polarization state controller, which comprises the following steps of: constructing an assembly error model by adopting a Mueller matrix, and simulating and analyzing an influence rule of an angle error of a polaroid and an LCVR2 (Liquid Crystal Voltage Receptor 2) on a polarization state; based on an influence rule of assembly errors, a two-step correction strategy based on computer-aided assembly and adjustment is provided. The two-step correction strategy comprises the following steps: firstly, carrying out angle correction on a polaroid by taking ellipsometric skewness of circularly polarized light as a criterion; then, angle correction of the LCVR2 is carried out on the basis of the included angles among the three pieces of linearly polarized light; an experiment light path is built for experiment verification, and meanwhile, the installed and adjusted liquid crystal polarization state controller is used for generating elliptically polarized light to verify the effectiveness of installation and adjustment. The method can effectively eliminate the assembly error, and achieves the high-precision output of the polarization state.

The invention discloses a polarization selection detection system and method for laser frequency locking and coherent population trapping resonance, and relates to the field of optoelectronics. Linear polarized light emitted by the vertical cavity surface emitting laser is changed into elliptically polarized light through the first lambda / 4 wave plate and then acts with 87Rb atoms in the atomic bubble, polarization selection is achieved by adjusting the included angle between the optical axes of the first lambda / 4 wave plate and the second lambda / 4 wave plate, and a light beam completing polarization selection is divided into two beams through the second lambda / 4 wave plate, the lambda / 2 wave plate and the polarization beam splitter. And the first photoelectric detector and the second photoelectric detector are respectively used for detection to obtain photoelectric signals. According to the invention, laser frequency locking can be realized at the same time, background signals brought by VCSEL fundamental frequency and high-order sideband light in CPT signals are removed, and the signal contrast is improved.

The present invention discloses a large-aperture two-dimensional continuous polarization modulation element and a preparation method. The surface of the element has a two-dimensional lattice internal stress distribution, and each stress point can realize continuous polarization modulation of linearly polarized light-elliptically polarized light-circularly polarized light-elliptically polarized light-circularly polarized light. The preparation of the element includes: selecting optical glass resistant to thermal shock as a substrate; performing heat treatment on a local point of the substrate to introduce thermal residual stress as internal stress, and realizing continuous modulation of the polarization of the local point based on the birefringence effect of the internal stress; and realizing large-aperture two-dimensional continuous polarization modulation by introducing a two-dimensional thermal residual stress array on the surface of the substrate. This method not only greatly simplifies the production process of large-aperture two-dimensional continuous polarization modulation elements and avoids the use of expensive ultra-large-size crystal materials, but also realizes precise modulation of the polarization of the entire large-aperture light beam. It has a high laser damage threshold and is particularly suitable for laser devices with large-aperture light beams.

Provided is a lens device, an optical filter unit, and an imaging device that can suppress the generation of ghost images. The lens device includes an optical filter unit in an optical path. The optical filter unit includes a plurality of openings including a first opening and a second opening, at least the first opening and the second opening include a band-pass filter, and at least one of an object side and an image side of the band-pass filter includes an optical element. The optical element includes a polarizing filter and a wave plate that converts linearly polarized light into circularly polarized light or elliptically polarized light, and the first opening and the second opening pass light of mutually different wavelength regions and polarization directions.

The utility model provides a focal plane full polarization sensing device, including substrate, phase delay layer, polarization detection layer and CCD sensor, the phase delay layer and polarization detection layer are arranged on one side of substrate in proper order, the phase delay layer has a plurality of phase delay zone in array arrangement, and the CCD sensor is arranged in the phase delay zone. The phase delay area comprises 2x < 2 > pixel units in different fast axis directions, the polarization detection layer is in single horizontal orientation, and the phase delay layer and the polarization detection layer are combined to form an elliptical polarization array, so that the simultaneous detection of four elliptical polarized lights is realized. The manufacturing process of the focal plane splitting polarization sensing device based on the metal wire grating is simplified, the manufacturing cost is reduced, efficient polarization imaging of the infrared band can be achieved, and the multi-band compatibility of the device is improved.

The invention provides a light generating system (1000) comprising a first light generating device (110), a luminescent material (200), a diffuser assembly (700), optical elements (500), and a light exit (1090), wherein; (A) the first light generating device (110) is configured to generate first device light (111); (B) the optical elements (500) comprise a first redirection optical element (1510) configured in a light-receiving relationship with the first light generating device (110); wherein the first redirection optical element (1510) is configured to (i) direct the first device light (111) in an optical path to the diffuser assembly (700), and to (ii) direct at least part of diffused device light (711) in an optical path to the luminescent material (200) (C) the diffuser assembly (700) comprises (a) a diffuser (710), wherein the diffuser (710) comprises a polarization maintaining diffuser, wherein the diffuser (710) is configured in the reflective mode; wherein the diffuser (710) is configured to diffuse at least part of the first device light (111) received by the diffuser (710) into diffused device light (711), wherein the diffused device light (711) has a full width half maximum of at least 5°; and (b) a quarter waveplate (720); wherein the light generating system (1000) is configured such that first device light (111) reaching the quarter waveplate (720) comprises linearly polarized light; wherein the quarter waveplate (720) is configured to convert linear polarized light received by the quarter waveplate (720) into elliptical polarized light and to convert elliptical polarized light received by the quarter waveplate (720) into linear polarized light; wherein the diffuser assembly (700) is configured to provide the diffused device light (711) in an optical path to the luminescent material (200) via the first redirection optical element (1510); (D) the luminescent material (200) is configured to convert at least part of the diffused device light (711) received by the luminescent material (200) into luminescent material light (201); (E) the optical elements (500) are configured to direct at least part of the luminescent material light (201) in an optical path to the light exit (1090); and (F) the light generating system (1000) is configured to generate in an operational mode of the light generating system (1000) system light (1001) comprising at least part of the luminescent material light (201).

The invention relates to dynamic adjustable optical tweezers based on a polarization-sensitive transverse bifocal superlens, and belongs to the field of optical tweezers technology and micro-nano optics. According to the super-lens, dynamic regulation and control of a focus are realized by using sensitive response of the silicon nano-column array to polarization through a composite propagation phase and a geometric phase. Under linear polarization or elliptically polarized light, the system can generate transversely symmetrical double focuses; under the circularly polarized light, a single-side focus is formed. By adjusting the polarization state of incident light, a double-particle capture mode, a single-particle capture mode and a particle transverse transport mode can be flexibly switched. According to the invention, the physical structure does not need to be changed, the dynamic control can be realized only by external optical regulation and control, the structure is compact, the integration degree is high, the control is flexible and the like, and a new technical approach is provided for an on-chip particle control system.

To provide a liquid surface vibration detection sensor and a liquid surface vibration detection unit for detecting vibrations of a liquid surface, and a liquid surface vibration monitoring device and a liquid surface vibration monitoring method for monitoring the status of targets such as aquaculture fish activity and aquaculture facilities on the basis of the detected vibrations.SOLUTION: The liquid surface vibration monitoring device includes: a liquid surface vibration detection sensor 10 that vertically irradiates a liquid surface 80 at predetermined intervals with elliptically polarized light 61, and focuses reflected light 62 slightly offset from the center of a light-receiving element 13 to output an electrical signal corresponding to the intensity of the reflected light 61 as a vibration signal of the liquid surface; and a liquid surface vibration detection unit 20 that controls the liquid surface vibration detection sensor 10 to continuously activate a light source 11 at a fixed cycle, and continuously outputs the vibration signal output from the light-receiving element 13 as a vibration waveform detection signal. The liquid surface vibration monitoring device analyzes the detection signal and monitors the status of the target via liquid surface vibrations by comparing the vibration waveform and vibration pattern of the liquid surface 80 with a threshold or a predetermined pattern obtained in advance.SELECTED DRAWING: Figure 1

A single-optical-path atom magnetometer based on a left-handed and right-handed circularly polarized light beam splitting metasurface belongs to the field of quantum precision measurement, and is characterized in that a laser corresponding to an alkali metal excitation wavelength emits a light beam, elliptically polarized light is emitted through a linear polarizer and a quarter-wave plate, and then enters a glass gas chamber containing alkali metal gas, and under the action of an external magnetic field, the elliptically polarized light is emitted to the left-handed and right-handed circularly polarized light beam splitting metasurface; incident elliptically polarized light generates an optical rotation angle, emergent light enters the left-handed and right-handed circularly polarized light beam splitting metasurface after being subjected to polarization conversion of the quarter-wave plate, left-handed and right-handed circularly polarized components of the incident light are subjected to beam splitting and respectively enter the corresponding photoelectric detectors, and precise measurement of an external magnetic field is realized through calculation processing of a rear-end circuit. The method has the advantages that under the condition that the single-optical-path compact structure of the atom magnetometer is reserved, elliptically polarized light is adopted as incident light, and high-sensitivity magnetic field measurement based on the rotation angle detection method is achieved through the left-handed and right-handed circularly polarized light beam splitting metasurfaces.

A light filter including first and second optical elements having light-absorbing transition dipole moments orientated with a tolerance of at most 20° parallel to a first direction for the first optical element and for the second optical element parallel to a second direction so light incident in the first or second optical element is transmitted or partially absorbed, depending on its direction of incidence relative to the respective element and its polarization state. A delay layer is between the elements as a C- or A-plate so that at least 85% of linearly- or elliptically-polarized light incident into the light filter at an angle of at least 35° to the first or second direction is absorbed, wherein the angle between the electric field of the linearly-polarized light or long half-axis of the elliptically-polarized light and the direction of incidence, projected onto the surface of the light filter, is less than 20°.

The embodiment of the invention relates to the technical field of display, and provides a phase adjusting element, a display module and electronic equipment. The phase adjustment element includes a light transmissive substrate, a light transmissive coating on a surface of the substrate, and a liquid crystal polymer layer on a surface of the coating away from the substrate. The refractive index of the liquid crystal polymer layer is larger than that of the coating, and the thickness of the liquid crystal polymer layer is variable, so that linearly polarized light entering the phase adjusting element from one side of the substrate is converted into mixed polarized light to be emitted after passing through the liquid crystal polymer layer, and the mixed polarized light contains linearly polarized light, circularly polarized light and elliptically polarized light. When the phase adjusting element is applied to the display module, the visual fatigue of a viewer is reduced, the brightness of the display module is improved, and the power consumption of the display module is reduced.

An ellipsoidal light atomic magnetometer device and method based on rotating fiber polarization utilizes a rotating fiber polarizer to emit elliptically polarized light of a set ellipticity, and directs this light beam into the atomic magnetometer head to cause it to interact with alkali metal atoms to achieve magnetic field measurement. The device and method designed in the present invention calculates the torsion length and torsion angle of the rotating fiber polarizer based on the set ellipticity, thereby causing the rotating fiber polarizer to emit elliptically polarized light of the set ellipticity. This elliptically polarized light is directed into the atomic magnetometer head, thereby polarizing the alkali metal atoms and generating an optical rotation angle for signal detection. A high-frequency modulated magnetic field is applied in a direction perpendicular to the light beam, and polarization differential detection technology and phase-locked amplification technology are used to obtain the magnetic field information to be measured. Compared with conventional atomic magnetometer configurations, the present invention uses a rotating fiber polarizer and an ellipsoidal light configuration to construct an atomic magnetometer, resulting in a more compact structure and enhanced temperature stability of the atomic magnetometer head.

An identification medium including a light reflection layer and a patterned phase difference layer, wherein the light reflection layer is a layer that reflects incident light as circularly polarized light or linearly polarized light, and the patterned phase difference layer is a layer that includes an area having a phase difference, and is a layer provided in the identification medium so that the area having a phase difference occupies a partial area of a display surface of the identification medium. Also provided are an article including the identification medium, and a method for using the identification medium wherein, in observation of the reflected light, a linear polarization component or a circular polarization component of the reflected light is selectively observed, or linearly polarized light, circularly polarized light, or elliptically polarized light is made incident as the incident light.

The application discloses an ellipsoidal light magnetic signal detection system and method based on a cascade super surface, wherein the system utilizes a cascade super surface polarization conversion device to emit elliptical polarized light with specific ellipticity, and guides the elliptical polarized light into an atomic chamber to interact with alkali metal atoms to realize magnetic field measurement. According to the required ellipticity, the application designs the Jones matrix of the cascade super surface, designs the material, structure and period of the super surface, converts the light emitted by a laser into elliptical polarized light with a predetermined ellipticity, and after the elliptical polarized light enters the atomic chamber, the optical rotation effect is generated while the alkali metal atoms are polarized, and the differential detection technology and the lock-in amplification technology are utilized to obtain the magnetic field information to be measured. Compared with a conventional magnetic signal detection system, the magnetic signal detection system built by using the cascade super surface polarization conversion device has the advantages of small volume and easy integration due to the compact structure and the miniaturized design concept.

An optical fiber current sensing controller module, where an optical transmitter is energized from a DC source and emits an optical field of calibrated intensity and wavelength to a linear polarizer which generates a reference signal which is then launched in alignment with the transmission axes of a polarization maintaining optical fiber link to a remote and passive fiber optic current sensor (FOCS), where the linearly polarized optical pulse traverses a complete circular path around an energized conductor and is subject to polarization plane rotation in proportion to the magnetic flux density with the integration equal to electric current magnitude according to Ampere's law, and the rotated polarized optical pulse is transmitted back to the optical fiber current sensing controller module via a return fiber optic cable, where the Stokes vector polarization parameters for the returned optical signal are calculated by splitting the elliptically polarized field into four components, passing these components through an analyzer comprised of a linear horizontal polarizer, a linear vertical polarizer, a linear polarizer with transmission axis set at 45 degrees, and a linear polarizer with transmission axis set at 135 degrees, respectively, and where the four separate outputs of the four fiber optic polarizing filters are connected respectively to four separate photodiodes which transduce each optical intensity to analog voltage outputs which are sampled by a digital signal processing chipset, where the Stokes vector parameters for the polarized optical signal are calculated directly from the digitally sampled array of optical intensity values transduced by the photodiodes, and the change in polarization state from which electrical current is measured is derived by comparing the initial linear polarization Stokes vector of the generated reference signal with the measured Stokes parameters of the elliptically polarized optical signal received from the analyzer, and where a sample of the generated polarized reference signal is measured at a photodiode to monitor online sensor network optical attenuation and reference signal power fluctuations.

The invention belongs to the technical field of rotational motion, and relates to a remote speed measurement method and system based on a partially coherent rotational Doppler Effect. Gaussian-Schell model partially coherent light is modulated into a circular polarization state and then is irradiated to a rotating object to be measured, and elliptically polarized light reflected by the rotating object to be measured is modulated by using a rotating linear polarizer; generating a first periodic time-domain light beam related to polarization information, screening the first periodic time-domain light beam by using a post-modulation mask of a three-hole structure to obtain a second periodic time-domain light beam related to rotation speed information, and performing Fourier transform on the second periodic time-domain light beam to obtain a Fourier spectrum; acquiring a polarization peak signal and a rotation peak signal in the Fourier spectrum, calculating the angular velocity of the rotating object to be measured based on the frequency of the rotation peak signal, and obtaining the polarization response of the rotating object to be measured based on the amplitude of the polarization peak signal and the amplitude of the rotation peak signal. According to the scheme, the rotating speed of an off-axis object can be accurately measured, and polarization response characteristics are obtained.

This invention relates to the field of optical engineering technology, specifically disclosing a polarized optical lens glare elimination system for vehicle-mounted security. The system includes: a reference polarization module, which constructs a controllable environment simulation test platform to collect reflected light data under different incident angles and water film thicknesses, calculates the degree of polarization and phase difference using the Stokes vector method, and constructs a quasi-polarized light characteristic library; a composite filtering module, which collects real-time reflected light data and compares it with the quasi-polarized light characteristic library to determine elliptically polarized light, and corrects it to linearly polarized light through phase compensation; a direction calibration module, which calculates the optical path deviation angle through a real-time direction calibration module and dynamically adjusts the filtering direction; a glare recognition module, which performs light intensity analysis on the corrected light to determine glare residue, identifies micro-glare spot areas through polarization degree calculation; and a grayscale correction module, which extracts the average grayscale value of the normal area and corrects the grayscale of the spot pixels, thereby achieving dynamic elimination of glare from reflected light on wet road surfaces.

The invention relates to a liquid crystal composition, an optical film, a polaroid and a display device, the liquid crystal composition is applied to a random depolarization functional layer, and the liquid crystal composition comprises a polymerizable liquid crystal material, the polymerizable liquid crystal material comprises at least one first liquid crystal compound as shown in a formula I and / or at least one second liquid crystal compound as shown in a formula II. The liquid crystal composition provided by the invention can be used for manufacturing a random depolarization functional layer, so that linearly polarized light is randomly converted into circularly polarized light and / or elliptically polarized light; therefore, the display device applying the random depolarization function layer realizes healthy eye-protection display.

Systems and methods for generating a pattern on an azopolymer film surface is provided. The method may comprise positioning an azopolymer film onto a motorized stage of a laser optical lithography system, setting a desired period, amplitude, and size of surface relief grating to be printed onto a surface of the azopolymer film, and printing an image onto the surface of the azopolymer film. Printing the image may comprise generating spatially uniform linearly polarized light, expanding and collimating the linearly polarized light, converting the linearly polarized light to circularly polarized light, converting the circularly polarized light to elliptically polarized light, converting the elliptically polarized light from a spatial light modulator (SLM) to a final desired linearly polarized light, focusing the linearly polarized light onto the surface of the azopolymer film, and moving the azopolymer film in relation to the final desired linearly polarized light, using the motorized stage.

The invention relates to the technical field of inter-satellite laser communication. The invention discloses an inter-satellite laser communication adaptive dynamic light splitting device and method, a satellite and a system, which can realize dynamic adjustment of a tracking light path and a communication light path splitting ratio, and is high in response speed and simple in structure. The device comprises a micro-electro-mechanical system and a polarization beam splitter, and the micro-electro-mechanical system is used for adjusting the phase delay amount of linearly polarized light at the current moment according to an adjusting signal and then outputting elliptically polarized light; and the polarization beam splitter is used for carrying out polarization state separation processing on the elliptically polarized light to obtain a first polarized light beam and a second polarized light beam corresponding to the current moment.

This invention provides a single-optical magnetic signal detection system and method based on a polarizing body grating, comprising: a laser, a pre-optical path unit, an atomic gas cell unit, a polarization detection unit, and a signal processing unit. The light emitted by the laser is modulated into elliptically polarized light by the pre-optical path unit and acts on the atomic gas cell unit, causing the alkali metal atoms to spin polarize. The polarization detection unit and signal processing unit then measure the magnitude of the external magnetic field using optical rotation detection. This method combines the advantages of existing single-optical and dual-optical atomic magnetometers, featuring a compact structure and simplified optical path. Differential detection suppresses common-mode noise, improving measurement accuracy and sensitivity. The optically pumped atomic magnetic resonance polarization detection is achieved using a liquid crystal polarizing body grating thin-film device with efficient polarization chiral splitting and large-angle single-order diffraction performance, realizing miniaturized design of the magnetic measurement system and laying the foundation for the system to move towards chip-level design.

A laser oscillator, comprising: a resonant cavity; a light source module (30), provided in the resonant cavity, the light source module (30) being configured to be able to output a first light beam, and the first light beam comprising elliptically polarized light; and a quarter-wave plate (40), provided in the resonant cavity and arranged on one side of the light source module (30) in the optical axis direction of the light source module (30), the quarter-wave plate (40) being perpendicular to the optical axis, and the quarter-wave plate (40) being configured to convert the elliptically polarized light in the first light beam into polarized light of a target type, so as to form a second light beam. The laser oscillator can achieve high-power pumping of a gain medium without being limited by the physicochemical properties of crystals, does not need selection of special crystal orientations of isotropic crystals, and improves the laser output efficiency.

The present application relates to an optical film, a polarizer, and a display device. The optical film includes a substrate layer and a depolarization layer located on one side of the substrate layer. The depolarization layer includes at least one main layer and birefringent particles dispersed in the at least one main layer. The angle between the slow axis direction of the birefringent particles and the winding direction of the substrate layer is greater than or equal to 35° and less than or equal to 55°. When linearly polarized light is incident on the optical film, the linearly polarized light is converted into circularly polarized light and / or elliptically polarized light by the depolarization layer. The present application can achieve a depolarization effect through a method with a simpler process, lower cost, and higher yield, thereby providing eye protection.

Provided are a lens device, a filter unit, and an imaging apparatus capable of suppressing occurrence of ghosts. The lens device includes a filter unit in an optical path. The filter unit has a plurality of opening portions including a first opening portion and a second opening portion. At least the first opening portion and the second opening portion each include a band-pass filter, and each include an optical element on at least one of an object side or an image side of the band-pass filter. The optical element is composed of a polarized light filter and a wave plate which converts linearly polarized light into circularly polarized light or elliptically polarized light. The first opening portion and the second opening portion pass light in different wavelength regions and different polarization directions.