Abstract:
The invention relates to an optical filter and a method for its production, and to a device for the examination of the spectral and spatial distribution of an electromagnetic radiation irradiated from an object. The invention is based on the task of providing an optical filter of the above described type that is inexpensive to produce, which can be used to detect a plurality of wavelengths, in which, however, tuning of the DBR mirrors by means of displacement is not necessary. Furthermore, a method for the production of such a filter is provided. According to a first aspect of the present invention this task is solved by a method for the production of an optical filter array having two DBR mirrors, and a cavity present between the same, comprising cavity sections having a plurality of different heights, each forming one Fabry Perot filter element, characterized by the following steps: applying a first DBR mirror onto a substrate, forming of a layer comprised of a cavity material on the DBR mirror, wherein this layer is equipped with a plurality of cavity sections forming the filter elements by means of utilizing a nanoimprint method, and applying the second DBR mirror on the cavity material having a structuring that is defined by the different heights of the cavity sections.
Abstract:
A method for creating a master and for generating an optical waveguide therefrom. The method includes creating a waveguide master having the geometrical form of at least one optical element formed therein; and generating an embossed optical waveguide from the master, the embossed optical waveguide being a negative of the master, the embossed optical waveguide having an optical element formed therein which corresponds to and is a negative of the geometrical form of the optical element formed in the master, the embossed optical waveguide being formed of a polymer material having a first index of refraction, wherein the optical element is formed in the polymer material and creates a local modification of the refractive index of the polymer material.
Abstract:
The invention discloses a multi-wavelength semiconductor light source comprising a plurality of semiconductor light sources mounted on a silicon sub-carrier and emitting radiation spanning a wavelength range. In preferred embodiments, these sources are configured in a linear and circular array. The radiation is coupled to a waveguide array disposed on the same silicon subcarrier, with a lower cladding of silicon dioxide and deposited core layer which is preferably the spin-on epoxy resin SU-8. Output from the waveguide array provides a compact multi-wavelength laser source with wide tuning range via a plurality of laser sources. An output spatial span of the waveguide array is smaller than an input spatial span and sufficiently small to probe the properties of a sample. A compact system for optical spectroscopy is constructed from the multi-wavelength semiconductor light source, a means for directing radiation from the source to a sample, and an optical detector configured to detect one of a radiation reflected from and transmitted through said sample. In various preferred embodiments, the semiconductor light sources can comprise lasers, light-emitting diodes, and superluminescent diodes.The system for optical spectroscopy can be used in a variety of applications including the analysis of in-vivo human tissue, agricultural samples, and pharmaceutical samples. Typical wavelength ranges for these and other applications include 650-1000 nm, 700-1700 nm, and 1100-2500 nm.
Abstract:
In a spectroscopy module 1, a light passing hole 50 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 50 and a light detecting portion 5a of the light detecting element 5 from deviating. Moreover, the light detecting element 5 is bonded to a front plane 2a of a substrate 2 with an optical resin adhesive 63. Thus, it is possible to reduce a stress generated onto the light detecting element 5 due to a thermal expansion difference between the light detecting element 5 and the substrate 2. Additionally, on the light detecting element 5, a first pool portion 101 is formed so as to be located at least between the light detecting portion 5a and the light passing hole 50 when viewed from a direction substantially perpendicular to the front plane 2a. Thus, when the light detecting element 5 is attached to the substrate 2 via the optical resin adhesive 63, the optical resin adhesive 63 is pooled to remain at the first pool portion 101. Thus, the optical resin adhesive 63 is prevented from penetrating into the light passing hole 50.
Abstract:
Optical characteristic measuring systems and methods such as for determining the color or other optical characteristics of teeth are disclosed. Perimeter receiver fiber optics preferably are spaced apart from a source fiber optic and receive light from the surface of the object/tooth being measured. Light from the perimeter fiber optics pass to a variety of filters. The system utilizes the perimeter receiver fiber optics to determine information regarding the height and angle of the probe with respect to the object/tooth being measured. Under processor control, the optical characteristics measurement may be made at a predetermined height and angle. Various color spectral photometer arrangements are disclosed. Translucency, fluorescence, gloss and/or surface texture data also may be obtained. Audio feedback may be provided to guide operator use of the system. The probe may have a removable or shielded tip for contamination prevention. A method of producing dental prostheses based on measured data also is disclosed. Measured data also may be stored and/or organized as part of a patient data base. Such methods and implements may be desirably utilized for purposes of detecting and preventing counterfeiting or the like.
Abstract:
A spectroscopy device that separates input light into a plurality of wavelength ranges. A metal body has a hole or aperture which is open on the upper side. The hole or aperture is formed in a polygonal shape having at least a pair of opposite faces not parallel to each other in horizontal cross-section. Inner side faces of the hole or aperture are finished as mirror like reflection surfaces. Polarized input light inputted from the opening to the hole or aperture is reflected by the reflection surfaces and a standing wave is generated inside of the hole or aperture by self interference, whereby the input light is separated into a plurality of wavelength ranges.
Abstract:
A nanostructured optical device includes a metal film or a plurality of metal islands having an array of a plurality of openings having a width that is less than at least one first predetermined wavelength of incident radiation to be provided onto the film or the islands. The metal film or islands are configured such that the incident radiation is resonant with at least one plasmon mode on the metal film or metal islands.
Abstract:
A Fabry-Perot cavity filter includes a first mirror and a second mirror. A gap between the first and the second mirror monotonically varies as a function of width of the filter. This filter may be used with photodetector and a channel selection filter in an optical device, such as a spectrum analyzer. The channel selection filter may be a metal nanooptic filter array which includes plurality of subwavelength apertures in a metal film or between metal islands.
Abstract:
A multi-spectral sensor system and methods are disclosed. One aspect of the invention comprises a multi-spectral sensor system mountable to a mobile platform. The system may comprise an image capturing system, a first translation stage affixed to the image capturing system and a stationary optics assembly. The system may further comprise a motion controller configured to move the first translation stage and image capturing system across the stationary optics along a traveling direction opposite of a traveling direction of the mobile platform and at substantially the same rate as the mobile platform is moving during a stare operation.