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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
Propagation of Waves01:07

Propagation of Waves

When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...

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Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
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Total-reflection wavelength demultiplexer using a highly dispersive medium.

M Tateda, F Kanaya

    Optics Letters
    |September 1, 2009
    PubMed
    Summary

    We developed a novel optical wavelength demultiplexer using the wavelength-dependent reflectivity between two dispersive media. This device achieves extremely low crosstalk for efficient optical signal separation.

    Area of Science:

    • Optics and Photonics
    • Optical Engineering

    Background:

    • Optical wavelength demultiplexers are crucial for wavelength-division multiplexing (WDM) systems.
    • Existing demultiplexers face challenges with crosstalk and fabrication complexity.

    Purpose of the Study:

    • To propose and theoretically analyze a new type of optical wavelength demultiplexer.
    • To leverage the wavelength dependence of reflectivity for demultiplexing applications.

    Main Methods:

    • Utilizing the phenomenon of total internal reflection at the interface of two media with different dispersive characteristics.
    • Analyzing the wavelength dependence of reflectivity to achieve signal separation.

    Main Results:

    • The proposed device demonstrates a novel approach to optical wavelength demultiplexing.

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  • Achieves near-zero crosstalk (< 4 x 10^-4) for wavelengths outside the design window.

    • Conclusions:

    • The proposed total-reflection-based demultiplexer offers a promising solution for high-performance optical communication systems.
    • This design provides excellent crosstalk performance, enhancing signal integrity.