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IR Spectrometers01:25

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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...
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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: Mar 17, 2026

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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Infrared shutter using cholesteric liquid crystal.

Gyu Jin Choi, Hye Min Jung, Seung Hee Lee

    Applied Optics
    |July 14, 2016
    PubMed
    Summary

    This study introduces an infrared light shutter using cholesteric liquid crystals for smart windows. The device controls indoor temperature by managing solar infrared radiation, offering energy efficiency.

    Area of Science:

    • Materials Science
    • Optics
    • Energy

    Background:

    • Controlling solar infrared radiation is key for maintaining optimal indoor temperatures.
    • Smart window technologies aim to dynamically manage light and heat transmission.
    • Existing light shutter devices have limitations in efficiency and application.

    Purpose of the Study:

    • To propose and evaluate an infrared light shutter device utilizing cholesteric liquid crystals.
    • To demonstrate the device's capability for temperature-controlled switching between infrared reflection and transmission.
    • To assess its potential as a functional component for next-generation smart windows.

    Main Methods:

    • Fabrication of an infrared light shutter device based on cholesteric liquid crystals.

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  • Utilizing an indium tin oxide (ITO) transparent electrode for electrically controlled heating.
  • Investigating the temperature-dependent switching between planar (reflective) and isotropic (transmissive) states.

    • Main Results:

    • The cholesteric liquid crystal device effectively controls infrared radiation transmission.
    • The device exhibits tunable transmittance across various gray levels based on temperature.
    • Successful switching between infrared reflective and transmissive states was achieved via electrical heating.

    Conclusions:

    • The proposed cholesteric liquid crystal device functions as an effective infrared light shutter.
    • Its temperature-dependent optical properties make it suitable for smart window applications, enhancing energy efficiency.
    • The device offers a promising, easily fabricated solution for next-generation window technologies.