Abstract: An apparatus includes an optical source providing an optical beam; a splitter configured to split the optical beam into a sample beam and a reference beam; a sample path containing a sample material to be analyzed, the sample beam being directed through the sample path so as to interact with the sample material; a reference path containing a reference material, the reference beam being directed through the reference path so as to interact with the reference material; a disperser configured to receive the sample beam after it exits the sample path and to receive the reference beam after it exits the reference path, the disperser outputting a dispersed sample beam and a dispersed reference beam; and a photodetector disposed to receive the dispersed sample beam and the dispersed reference beam and outputting electrical signals comprised of data indicative of a spectra of the sample beam after it exits the sample path and a spectra of the reference beam after it exits the reference path.

Abstract: A spectrometric measurement apparatus includes a light radiation unit for radiating light onto a medium; a hole array including openings arranged one-dimensionally for transmitting diffusion light from the medium; an imaging optical system configured to focus an image from the hole array; a diffraction element configured to diffract the light for focusing the image; and a light receiving unit including pixels arranged one-dimensionally configured to receive the light that has been dispersed by the diffraction element and spectrometric sensors each corresponding to a predetermined number of the pixels. The light transmitted through each of the openings of the hole array is dispersed by the diffraction element, and then the light enters the pixels so that spectral properties of the diffusion light are acquired. The structure of the diffraction element includes variations that are formed in accordance with the height of the image that is focused by the imaging optical system.

Abstract: An apparatus consisting of two pairs of identical lenses which is suitable as a compound objective lens for high numerical aperture imaging is disclosed. The compound lens also has a wide field of view as a fraction of the compound lens focal length. By suitable choice of lens materials, well corrected near infrared imaging can be achieved. When two such compound lenses together with a diffraction grating are assembled into a spectrometer, excellent wavelength resolution in the near infrared can also be obtained.

Abstract: A radiation generation device for generating resulting electromagnetic radiation having an adjustable spectral composition includes: a multitude of radiation elements (configured to generate a radiation element specific electromagnetic radiation, respectively, upon being activated, a first radiation element of the multitude of radiation elements being activatable independently of a second radiation element of the multitude of radiation elements; a dispersive optical element; and an optical opening; the dispersive optical element being configured to deflect the radiation element specific electromagnetic radiations, in dependence on their wavelength and on a position of the radiation element generating the respective radiation element specific electromagnetic radiation, such that a particular spectral range of each of the radiation element specific electromagnetic radiations may exit through the optical opening, so that the spectral composition of the resulting electromagnetic radiation exiting through the opti

Abstract: A transmissive diffraction grating includes a polarization conversion layer, a first diffractive layer disposed on one surface side of the polarization conversion layer, and a second diffractive layer disposed on the other surface side of the polarization conversion layer. Both the first diffractive layer and the second diffractive layer include refractive index modulation structures arranged with a period P in a first direction, and diffraction efficiency for a TE polarized light component is higher than a diffraction efficiency for a TM polarized light component.

Abstract: A catadioptric dual waveband imaging spectrometer that covers the visible through short-wave infrared, and the midwave infrared spectral regions, dispersing the visible through shortwave infrared with a zinc selenide grating and midwave infrared with a sapphire prism. The grating and prism are at the cold stop position, enabling the pupil to be split between them. The spectra for both wavebands are focused onto the relevant sections of a single dual waveband detector. Spatial keystone distortion is controlled to less than one tenth of a pixel over the full wavelength range, facilitating the matching of the spectra in the midwave infrared with the shorter wavelength region.

Abstract: A diffraction grating structure having ultra-high density of grooves comprises an echellette substrate having periodically repeating recessed features, and a multi-layer stack of materials disposed on the echellette substrate. The surface of the diffraction grating is planarized, such that layers of the multi-layer stack form a plurality of lines disposed on the planarized surface of the structure in a periodical fashion, wherein lines having a first property alternate with lines having a dissimilar property on the surface of the substrate. For example, in one embodiment, lines comprising high-Z and low-Z materials alternate on the planarized surface providing a structure that is suitable as a diffraction grating for EUV and soft X-rays. In some embodiments, line density of between about 10,000 lines/mm to about 100,000 lines/mm is provided.

Abstract: An air quality instrumentation system for a concentrated solar power generation system using a fluid heat transfer medium includes a pipe, a window and a spectroscope. The pipe extends from the concentrated solar power generation system and contains system air from within the concentrated solar power generation system. The window is positioned within the pipe to permit light to pass through the pipe and the system air. The spectroscope is positioned adjacent the window to assess concentration of a constituent within the system air, the concentration of the constituent providing an indication of an operating condition of the concentrated solar power generation system.

Abstract: Large digital displays for entertainment, architectural and advertising displays have interconnected display panels with pluralities of light emitting elements. To solve calibration problems, each of the display panels stores measured luminance and chromaticity data for each of the light emitting elements of the panel. The luminance data is independent of the chromaticity data. A central controller can then perform calibration procedures so that the light emitting elements are matched across the entire display.

Abstract: A method for designing a two-dimensional array overlay target comprises the steps of: selecting a plurality of two dimensional array overlay targets having different overlay errors; calculating a deviation of a simulated diffraction spectrum for each two-dimensional array overlay target; selecting an error-independent overlay target by taking the deviations of the simulated diffraction spectra into consideration; and designing a two dimensional array overlay target based on structural parameters of the error-independent overlay target.

Abstract: A spectrometer is provided including a camera and an axial symmetric camera mount configured to receive the camera and to rotate. The spectrometer furthers include an input for providing optical radiation to a spectrometer system; a diffraction grating for dispersing the optical radiation along a prescribed plane; at least one lens for focusing wavelength-dispersed light onto at least one array of a detector of optical radiation, wherein the camera has at least one linear array of elements for detecting optical radiation; a mechanical housing, wherein the axial symmetric camera mount is configured to couple the camera to the mechanical housing; and a means for rotating the camera coupled to the mechanical housing about an axis. Related systems and methods are also provided.

Abstract: A method for the determination of the degree of contamination of an examination object, such as a system for filling liquid foodstuffs, or a component or subsection of a system, in particular a pipe, including measuring a property distribution of a first examination medium before and after passage through the examination object.

Abstract: In accordance with an example embodiment of the present invention, apparatus comprising a waveguide and a spectral dispersion element, the apparatus being configured to be moveably attachable to a portable device, the portable device comprising a radiation sensing element and a radiation source, the apparatus being configured to be moveably attachable to the portable device to provide a first configuration in which the waveguide is positioned to transmit radiation from the radiation source towards an analyte region and/or from the analyte region towards the dispersion element; and such that the dispersion element is positioned to disperse radiation from the analyte region to form a spectrum which is provided towards the radiation sensing element for spectral analysis, and a second configuration in which the radiation sensing element and radiation source are able to capture and illuminate a scene for image capture.

Abstract: A multi field of view hyperspectral imaging device and method for using the same are described herein. In one embodiment, the multi field of view hyperspectral imaging device comprises multiple fore optics, multiple fold mirrors, a slit including a multiple openings, a spectrometer, and a 2-dimensional detector.

Abstract: A method for measuring the refractive index of a material with Bragg gratings includes the emission of a collimated radiation beam (9) from a radiation source (4) with a large spectrum and orientation thereof along a direction normal to the material (2) to be examined, the propagation of the collimated radiation beam (9) entering the material (2), then a Bragg diffraction grating (3) that is obliquely placed to the direction of the collimated radiation beam (9), and again the material (2), the subjection to spectral analysis of the collimated radiation beam exiting the material (2), the grating (3) producing a minimum in the spectrum subjected to the spectral analysis in accordance with Bragg's law, and the calculation of the refractive index of the material (2) from the measure of the wavelength corresponding to the minimum in thus spectrum. A relevant apparatus is described.

Abstract: Wavenumber linear spectrometers are provided including an input configured to receive electromagnetic radiation from an external source; collimating optics configured to collimate the received electromagnetic radiation; a dispersive assembly including first and second diffractive gratings, wherein the first diffraction grating is configured in a first dispersive stage to receive the collimated electromagnetic radiation and wherein the dispersive assembly includes at least two dispersive stages configured to disperse the collimated input; and an imaging lens assembly configured to image the electromagnetic radiation dispersed by the at least two dispersive stages onto a linear detection array such that the variation in frequency spacing along the linear detection array is no greater than about 10%.

Abstract: The present invention provides a small spectroscope that has a short response time. A spectroscope according to one embodiment of the present invention includes: a beam deflector that includes an electro-optic crystal, having an electro-optic effect, and paired electrodes used to apply an electric field inside the electro-optic crystal; spectroscopic means for dispersing light output by the beam deflector; and wavelength selection means for selecting light having an arbitrary wavelength from the light dispersed and output by the spectroscopic means.

Abstract: A method of attaching an object to be measured to a structure causing a diffraction phenomenon; irradiating the structure to which the object to be measured is attached and which causes the diffraction phenomenon with an electromagnetic wave; detecting the electromagnetic wave scattered by the structure causing the diffraction phenomenon; and measuring a characteristic of the object to be measured from the frequency characteristic of the detected electromagnetic wave. The object to be measured is attached directly to the surface of the structure causing the diffraction phenomenon. Thus, the method for measuring the characteristic of an object to be measured exhibits an improved measurement sensitivity and high reproducibility. A structure causing a diffraction phenomenon and used for the method, and a measuring device are provided.

Abstract: A biochip reader wherein spectroscopic information of a sample under analysis is arranged in spaces between images of the sample arranged on a biochip. The reader comprises a confocal microscope and the biochip comprises a transparent substrate to allow passage of the excitation light and fluorescent light from the sample with the excitation light being applied from the side opposite that on which the samples are arranged so that noise from dust and the like is avoided by the transmitted light avoiding contact with the dust. Another aspect is an electrophoresis system wherein different coloring material are used for each of a variety of target substances, so that the same lane and area are utilizable to concurrently detect a polychrome fluorescent pattern of the different targets. A confocal scanner or fluorescence imaging system is used with a plurality of filters to detect the multi-colored fluorescences of the target substance.

Abstract: An optical spectrum analyzer includes a diffraction-grating control unit configured to change an angle of a diffraction grating to change a wavelength of a dispersed light beam extracted from incident light, a calculator unit configured to calculate an angle of the diffraction grating such that the wavelength of the dispersed light beam has a sampling wavelength, and to store the data indicating the angle, a FIFO memory configured such that part of the data is inputted to it, for outputting the data at each reception of a trigger signal indicating timing of sampling, and an FIFO memory control unit configured to output the subsequent data to the FIFO memory, when a remaining data amount of the FIFO memory reaches a predetermined value or lower.

Abstract: Hyperspectral imaging system and methods that may be used for imaging objects in three-dimensions are disclosed. A cylindrical lens array and/or a slit array may be used to re-image and divide a field of view into multiple channels. The multiple channels are dispersed into multiple spectral signatures and observed on a two-dimensional focal plane array in real time. The entire hyperspectral data cube is collected simultaneously.

Abstract: Systems, including methods, apparatus, and algorithms, for spectrally imaging a two-dimensional array of samples.

Abstract: A focus apparatus comprises a first illuminator for emitting light onto an object, an optical apparatus, an image capture apparatus for receiving an image of the object through the optical apparatus, and converting the image into electronic signals, a spectroscope, a coaxial light apparatus and a patterned light apparatus. The coaxial light apparatus and the patterned light apparatus are perpendicularly mounted to a spectroscope. The coaxial light apparatus is perpendicular to the patterned light apparatus. The spectroscope refracts patterned light from the patterned light apparatus and coaxial light from the coaxial light apparatus to the optical apparatus.

Abstract: An optical detecting apparatus for a bio-chip, the optical detecting apparatus including: a light source system for illuminating a bio-chip with an excitation light; a fluorescent light detecting system for detecting a fluorescent light emitted by the bio-chip; and a light path altering unit for directing the excitation light emitted by the light source system to a bio-chip and directing the fluorescent light emitted by the bio-chip to the fluorescent light detecting system, wherein a cross-sectional area of the excitation light irradiated by the light source system onto the bio-chip is greater than an area of the bio-chip, and the fluorescent light detecting system detects a fluorescent image of the entire bio-chip with a single illumination of excitation light.

Abstract: Described herein is a photonic spectrograph for accurately measuring and displaying spectra from radiation signals received from a telescope. One embodiment provides a photonic imaging device, in the form of a spectrograph, including a plurality of input ports for receiving an arbitrary incident electromagnetic radiation field containing one or more spatial propagation modes; a coupling device attached to the multi-mode optical fibre for efficiently coupling the incident electromagnetic radiation field into an arbitrary plurality (N) of single-mode optical fibres; an optical manipulation device which selectively combines the single-mode signals into a continuous optical spectrum; and an optical detector for detecting the continuous optical spectrum.

Abstract: The present invention provides a hybrid dielectric/SPP waveguide that can form either a single mode, single polarization waveguide, or a multi-mode waveguide. When multi-mode, this invention effectively transfers energy back and forth between the dielectric waveguide and metal surface. This improves on standard SPP modes, yielding longer range propagation along with high intensity near the metal surface at decisive locations. When single-mode, this hybrid waveguide allows for control of propagation and confinement for applications such as telecommunications optics integrated on silicon microchips. Gratings may be patterned in the metal for coupling light into and out of the modes or for use as mirrors in the mode. For areas where very long ranges are required, a metal grating may be used to couple light into the mode, but then the metal may be removed in other regions and make the range of the mode virtually infinite (limited by surface roughness).

Abstract: Hyperspectral imaging systems that may be used for imaging objects in three-dimensions with no moving parts are disclosed. A lenslet array and/or a pinhole array may be used to reimage and divide the field of view into multiple channels. The multiple channels are dispersed into multiple spectral signatures and observed on a two-dimensional focal plane array in real time. The entire hyperspectral datacube is collected simultaneously.

Abstract: This disclosure describes an aperture shaped to provide a narrow beam in the horizontal plane but a wider beam in the vertical plane that will provide improved image quality in spectrometers.

Abstract: A spectrometer in accordance with the present disclosure may provide multiple optical paths from the inputs to the camera, where the paths are as nearly identical as possible. For example, a spectrometer in accordance with the present disclosure may include multiple inputs, input optics, a diffraction grating, output optics, and a camera. The multiple inputs may be imaged onto different sections of the camera using the same input optics, the same diffraction grating, and the same output optics.

Abstract: A method of detecting oxygen and/or chemical content in a subject, comprising generating at least one spectral image of the subject; generating at least one spectral image of a reference object; comparing spectrum from the subject image to the reference image to thereby reveal the relative oxygen content of the subject. A system for determining the level of oxygenation of the blood of a subject body part comprising: a hyperspectral image generator for generating a plurality of spectral images; an image capture device for capturing the spectral images; a processor for generating hyperspectral image cubes such that the spectrum of the body part is extracted and normalized using the spectrum from the reference object to cancel out the spectral response of the light source and the imager; said processor comparing spectral from a subject image to reference images to thereby reveal the relative oxygen content of the subject.

Abstract: A spectroscopic detector includes a spectroscopic element for dispersing light, a photodetector for detecting the light dispersed by the spectroscopic element and a condensing optical system for condensing the dispersed light to the photodetector and compensating for a deviation in a detected wavelength deriving from nonlinearity of the angle of emergence generated in the spectroscopic element through chromatic aberration of magnification.

Abstract: A spectrometer having substantially increased spectral and spatial fields.

Abstract: A Spectrometer is provided including a camera and an axial symmetric camera mount configured to receive the camera and to rotate. The spectrometer furthers include an input for providing optical radiation to a spectrometer system; a diffraction grating for dispersing the optical radiation along a prescribed plane; at least one lens for focusing wavelength-dispersed light onto at least one array of a detector of optical radiation, wherein the camera has at least one linear array of elements for detecting optical radiation; a mechanical housing, wherein the axial symmetric camera mount is configured to couple the camera to the mechanical housing; and a means for rotating the camera coupled to the mechanical housing about an axis. Related systems and methods are also provided.

Abstract: A method of detecting the velocity of a moving object comprising the steps of: passing a beam of coherent light through an optical mask having a pattern of alternating opaque and non-opaque regions formed thereon, whereby an image of alternating light and dark fringes is projected along the length of the light beam; causing the moving object to pass through the projected image such that a portion of the light beam is reflected from the moving object as a series of pulses; detecting the reflected light pulses and the frequency of the pulses; and calculating the velocity of the object as a function of the pulse frequency and the known separation of the fringes of the image.

Abstract: Embodiments of a system and method for collecting hyperspectral and polarimetric data that are spatially and temporally coincident include a dispersive element configured to receive incident electromagnetic radiation. The dispersive element is configured to disperse a non-zero order of the electromagnetic radiation into its constituent spectra, which is directed to a first focal plane array, and may be read out as hyperspectral data. The dispersive element is also configured to reflect a zero order of the electromagnetic radiation, which is directed through a polarity discriminating element to a second focal plane array, which may be read out as polarimetric data. By synchronously reading out the first and second focal plane arrays, the hyperspectral and polarimetric data may be both spatially and temporally coincident.

Abstract: A field use optical grain characterising system (101) includes a generally rectangular prismatic composite body (102) that defines a component cavity (103). A substantially vertical elongate channel (104) extends within cavity (103) for housing a grain sample (not shown). An electromagnetic radiation source, in the form of a 12 Volt halogen lamp (105), is disposed within cavity (103.) for directing NIR light into channel (104). An optical detection system (107) is disposed within cavity (103) for sensing selected light emerging from channel (104) and for providing a sensor signal. A processor, which is included within detection system (107), is also disposed within cavity (103) and is responsive to the sensor signal for providing data indicative of a characteristic parameter of the grain sample. A display device, in the form of a 5.7-inch touch screen LCD display (108), is connected with body (102) for selectively presenting the data.

Abstract: A microscanning system including a microscope, a relay lens device, a stepping motor and a hyper-spectrometer is disclosed. The microscope is adapted to acquire and enlarge an image of an object to generate an enlarged image which is a 2D image distributed along the first direction and second direction. The relay lenses device disposed behind the microscope receives and transfers the enlarged image outputted by the microscope. The stepping motor electrically connected to the relay lens device reciprocates the relay lens linearly in the first direction device in a stepwise manner along the second direction. . The hyper-spectrometer disposed behind the rely lens device receives the partial enlarged images of the object along the first direction that are transferred by the relay lens device sequentially along the second direction, and transform the partially enlarged images into the corresponding spectrum information.

Abstract: In accordance with an example embodiment of the present invention, apparatus comprising a waveguide and a spectral dispersion element, the apparatus being configured to be moveably attachable to a portable device, the portable device comprising a radiation sensing element and a radiation source, the apparatus being configured to be moveably attachable to the portable device to provide a first configuration in which the waveguide is positioned to transmit radiation from the radiation source towards an analyte region and/or from the analyte region towards the dispersion element; and such that the dispersion element is positioned to disperse radiation from the analyte region to form a spectrum which is provided towards the radiation sensing element for spectral analysis, and a second configuration in which the radiation sensing element and radiation source are able to capture and illuminate a scene for image capture.

Abstract: Hyperspectral imaging system and methods that may be used for imaging objects in three-dimensions are disclosed. A cylindrical lens array and/or a slit array may be used to re-image and divide a field of view into multiple channels. The multiple channels are dispersed into multiple spectral signatures and observed on a two-dimensional focal plane array in real time. The entire hyperspectral data cube is collected simultaneously.

Abstract: A spectrometer system includes an array of micro-zone plates (MZP) each having coaxially-aligned ring gratings, a sample plate for supporting and illuminating a sample, and an array of photon detectors for measuring a spectral characteristic of the predetermined wavelength. The sample plate emits an evanescent wave in response to incident light, which excites molecules of the sample to thereby cause an emission of secondary photons. A method of detecting the intensity of a selected wavelength of incident light includes directing the incident light onto an array of MZP, diffracting a selected wavelength of the incident light onto a target focal point using the array of MZP, and detecting the intensity of the selected portion using an array of photon detectors. An electro-optic layer positioned adjacent to the array of MZP may be excited via an applied voltage to select the wavelength of the incident light.

Abstract: An optical system with a tilted window. The novel optical system includes a first optical element for receiving an input signal and generating an output signal; a first window adapted to transmit the output signal, the first window being tilted at an angle relative to an axis normal to an optical axis of the system; and a second window adapted to compensate for the first window. In an illustrative embodiment, the first window is an input window of a camera adapted to detect the output signal and is tilted such that reflections from and within the window do not strike detector elements of the camera. In a preferred embodiment, the second window has similar thickness and optical properties as the first window, and is positioned in the optical path of the input signal, tilted at an angle designed to compensate for the first window.

Abstract: The spectrometer 1 is provided with a package 2 in which a light guiding portion 7 is provided, a spectroscopic module 3 accommodated inside the package 2, and a support member 29 arranged on an inner wall plane of the package 2 to support the spectroscopic module 3. The spectroscopic module 3 is provided with a body portion 11 for transmitting light made incident from the light guiding portion 7 and a spectroscopic portion 13 for dispersing light passed through the body portion 11 on a predetermined plane of the body portion 11, and the spectroscopic portion 13 is supported by the support member 29 on the predetermined plane in a state of being spaced away from the inner wall plane.

Abstract: A spectrometer comprises a detector array and a prism. The prism comprises a first prism element comprising a substantially crystalline crown material, and a second prism element contacting the first prism element, the second prism element comprising a substantially crystalline flint material. The spectrometer further includes optics configured to direct light at least twice through the prism. The prism is configured to disperse light received from the optics at an incident angle therethrough into constituent spectra in visible and infrared wavelength bands that are dispersed from the prism at angles offset from the incident angle. The constituent spectra are directed onto the detector array with approximately equal dispersion across the visible and infrared wavelength bands. Among other things, desirable material selections for the first and second prism elements are also disclosed.

Abstract: A spectrometer comprises a detector array and a prism. The prism comprises a first prism element comprising a substantially crystalline crown material, and a second prism element contacting the first prism element, the second prism element comprising a substantially crystalline flint material. The spectrometer further includes optics configured to direct light at least twice through the prism. The prism is configured to disperse light received from the optics at an incident angle therethrough into constituent spectra in visible and infrared wavelength bands that are dispersed from the prism at angles offset from the incident angle. The constituent spectra are directed onto the detector array with approximately equal dispersion across the visible and infrared wavelength bands. Among other things, desirable material selections for the first and second prism elements are also disclosed.

Abstract: A spectral characteristic measuring apparatus includes: an illuminating section for irradiating illumination light onto a sample; a spectral section for separating light from the sample irradiated with the illumination light into light rays in accordance with wavelengths; a light receiving section including a plurality of light receiving elements for receiving the light rays separated by the spectral section in accordance with wavelengths, and converting the received light rays into electrical output signals; and a storing section for storing a combined central wavelength of each of the light receiving elements calculated in advance based a spectral intensity distribution of the illumination light.

Abstract: The apparatus for scanning at least one hyper-spectral image comprises an optical system, the hyper-spectrometer and the relay module. The hyper-spectrometer is disposed apart from the optical system. The optical system can focus an optical image of a target in a focal plane thereof, where the focal plane contains a plurality of row portions of the optical image. The relay module can selectively relay one of the row portions of the optical image to the hyper-spectrometer. Moreover, a method for scanning at least one hyper-spectral image is disclosed in specification.

Abstract: Systems, including methods, apparatus, and algorithms, for spectrally imaging a two-dimensional array of samples.

Abstract: In a spectroscopy module 1, a light passing hole 5b through which a light L1 advancing to a spectroscopic portion 4 passes is formed in a light detecting element 5. Therefore, it is possible to prevent the relative positional relationship between the light passing hole 5b and a light detecting portion 5a of the light detecting element 5 from deviating. Moreover, the light to be measured L1 advancing to the spectroscopic portion 4 via the light passing hole 5b and the diffracted lights L2 advancing to the light detecting portion 5a from the spectroscopic portion 4 pass through a void formed between the light detecting element 5 and the substrate 2 by an opening portion 10a of a wiring substrate 10. Therefore, according to the spectroscopy module 1, it is possible to improve the reliability.

Abstract: A cryogenically cooled imaging spectrometer that includes a spectrometer housing having a first side and a second side opposite the first side. An entrance slit is on the first side of the spectrometer housing and directs light to a cross-disperser grating. An echelle immersions grating and a catadioptric lens are positioned in the housing to receive the light. A cryogenically cooled detector is located in the housing on the second side of the spectrometer housing. Light from the entrance slit is directed to the cross-disperser grating. The light is directed from the cross-disperser grating to the echelle immersions grating. The light is directed from the echelle immersions grating to the cryogenically cooled detector on the second side of the spectrometer housing.

Abstract: The present invention provides a method of making highly charged, monodisperse particles which do not absorb deep ultraviolet (UV) light and a method of making crystalline colloidal array (CCA) deep UV narrow band radiation filters by using these highly charged monodisperse particles. The CCA filter rejects and/or selects particular regions of the electromagnetic spectrum while transmitting adjacent spectral regions. The filtering devices of the present invention are wavelength tunable over significant spectral intervals by changing the incident angle of the CCA filter relative to the light. Larger wavelength changes can be obtained by changing the concentrations of particles in the CCAs. The present invention also includes applications of the CCA filter to hyperspectral imaging and Raman imaging devices.