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Related Concept Videos

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...
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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.

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Optimum conditions in the attenuated total reflection technique.

H Kitajima, K Hieda, Y Suematsu

    Applied Optics
    |March 24, 2010
    PubMed
    Summary

    This study optimizes the attenuated total reflection (ATR) technique for total energy absorption by creating localized thickness variations. This method accurately determines unknown parameters like refractive index and film thickness for thin metal and silica films.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Spectroscopy

    Background:

    • The Attenuated Total Reflection (ATR) technique is sensitive to surface and thin film properties.
    • Accurate determination of optical constants and layer thicknesses is crucial for material characterization.
    • Existing ATR methods may face challenges with unknown parameters like gap thickness and sample properties.

    Purpose of the Study:

    • To investigate and establish optimum conditions for the ATR technique to achieve total energy absorption.
    • To develop a method for determining unknown parameters in ATR measurements, including complex refractive index and film thickness.
    • To validate the optimized ATR technique by characterizing thin gold and silica films.

    Main Methods:

    • Fabrication of a localized thickness variation in the prism-sample gap using point contact pressure.
    • Utilizing three prism coupling systems with different refractive indices.
    • Applying the ATR technique to measure optical properties and thicknesses of thin films.

    Main Results:

    • Demonstrated that localized thickness variations enable total energy absorption under optimum ATR conditions.
    • Successfully measured the complex refractive indices and foil thicknesses of thin gold films on glass.
    • Determined the refractive index and film thickness of a silica film on a metal substrate.

    Conclusions:

    • The optimized ATR technique with localized thickness variation is effective for precise material characterization.
    • This method allows for the accurate determination of unknown parameters in thin film analysis.
    • The study provides a robust approach for analyzing optical properties of thin metal and dielectric films.