Optical communications by dense wavelength division multiplexing (DWDM or WDM), which uses a number of wavelengths and a signal on each wavelength channel for transmission, has made massive progress as a high-speed, high-capacity optical communication system for the Internet age. A crucial device in this kind of communication system is the optical wavelength filter used to separate out the wave...

In many situations in everyday life, sunlight levels need to be reduced. Optical filters with asymmetric transmittance dependent on the incident angle would useful for sunglasses and vehicle or architectural windows, among others. Herein, we realized production of optical filters, called “louver filters”, comprising HAN-type LC film produced using liquid crystalline ink dichroic dyes. For forma...

We propose the synthesis of frequency dispersion of layered structures based on the design of multi-ordered optical filters using nanocircuit concepts. Following the well-known insertion loss method commonly employed in the design of electronic and microwave filters, here we theoretically show how we can tailor optical dispersion as we carry out the design of several low-pass, high-pass, band-p...

We discuss the theoretical and experimental investigation of acousto-optic dispersive tunable filters, based on quasi-collinear geometry of light-sound interaction in a tellurium dioxide single crystal. The geometry uses the effect of strong acoustic anisotropy in the paratellurite as well as peculiarities of acoustic wave reflections at the free boundary of the crystal. A mathematical concept ...

Abstract— Optical filters are a fundamental part of spectrometric measurements of ultraviolet (UV), visible and infrared (IR) radiation. In the present paper, optical filter is considered as a part of an optical system that has the purpose of modifying the intensity, polarization or, in particular, the spectral distribution of light. A beam of light enters through an aperture, is modified, and ...

Night vision and related thermal imaging systems play a critical role in the protection of our nation's security. These systems record images using video cameras designed for operation in the infrared (IR) region of the light spectrum. As with any imaging system, increased functionality and new information is gained when discrete portions of the observed light spectrum are analyzed separately u...

Optical and nonlinear-optical properties of negativeindex nanocomposite as well as the feasibility of a design of novel photonic microdevices and all-optical data processing chips are numerically simulated. Keywords—Numerical simulation, nano materials and nanostructures, negative-index metamaterials, nanophotonics, nano and micro devices, all-optical switches, optical frequency narrow-band fil...

In the paper, we present numerical results on characterization of transmitting properties of wideband filters based on linear and nonlinear photonic crystals confined with the waveguide. Novel characteristics of the PhC filters such as density of modes maps and transmission maps are computed, and their efficiency is analyzed. Presented characteristics can be used as an auxiliary optimization to...

Spectral transmittance in optical microscopic image was estimated from multi-band image taken through five broad band filters based on Wiener estimation method. Matrix for Wiener estimation was calculated using the 16 spectral transmittances of color transparencies measured in advance by spectral photometer. The optical microscope adjusted for monochrome digital camera (Kodak DCS420m, 1536x1024...