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Related Concept Videos

Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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Related Experiment Video

Updated: Jun 20, 2026

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
10:33

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Published on: February 27, 2019

Opto-optical switching in the infrared using CdTe.

W H Steier, J Kumar, M Ziari

    Optics Letters
    |September 15, 2009
    PubMed
    Summary

    Opto-optical switching was achieved in Cadmium Telluride:Indium (CdTe:In) using a 1.06-micrometer control beam to modulate a signal beam. This rapid switching effect leverages photocharge-induced electric-field shielding within the material.

    Area of Science:

    • Optoelectronics
    • Materials Science
    • Nonlinear Optics

    Background:

    • Opto-optical switching offers potential for advanced optical signal processing.
    • Cadmium Telluride (CdTe) and its indium-doped variant (CdTe:In) are known for nonlinear optical properties.

    Purpose of the Study:

    • To demonstrate and investigate opto-optical switching in CdTe:In.
    • To explore the underlying mechanism of photocharge-induced electric-field shielding.

    Main Methods:

    • Utilized a 1.06-micrometer control beam to induce opto-optical switching.
    • Employed a 1.06-micrometer signal beam to observe the switching effect.
    • Analyzed the switching speed and the role of photocharge in CdTe:In.

    Main Results:

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    • Successfully demonstrated opto-optical switching of a 1.06-micrometer signal beam by a 1.06-micrometer control beam in CdTe:In.
    • Identified photocharge creation and subsequent electric-field shielding as the primary switching mechanism.
    • Observed switching times in the microsecond range.

    Conclusions:

    • CdTe:In exhibits efficient opto-optical switching capabilities.
    • The material's high figure of merit (n(3)r/) is advantageous for this application.
    • The observed effect holds promise for high-speed optical switching applications.