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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

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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.
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Related Experiment Video

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
13:44

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Accurate thickness measurement method for thin layer in thick materials using terahertz technology.

Sen-Cheng Zhong, Liang-Hui Du, Hu-Gui Jin

    Optics Express
    |August 13, 2025
    PubMed
    Summary
    This summary is machine-generated.

    We developed two new terahertz time-domain spectroscopy (TDS) fitting methods to precisely measure thin layers in thick materials. These methods significantly improve resolution for layered material characterization.

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    Area of Science:

    • Physics
    • Materials Science
    • Spectroscopy

    Background:

    • Terahertz time-domain spectroscopy (TDS) faces challenges in resolving thin layers within thick materials.
    • Accurate thickness measurement is crucial for characterizing layered materials.

    Purpose of the Study:

    • To introduce and validate two novel time-domain fitting methods for enhanced thin-layer thickness detection in thick materials using TDS.
    • To overcome the resolution limitations of existing TDS thickness measurement techniques.

    Main Methods:

    • Development of an experimental reference signal-based method (TDF-ER) for accurate TDS measurements.
    • Development of a simulated reference signal-based method (TDF-SR) for situations where experimental references are unavailable.
    • Simulation and experimental validation of both TDF-ER and TDF-SR methods on various material samples.

    Main Results:

    • The TDF-ER method achieved precise surface coating measurements on metal substrates, detecting thicknesses down to 4 μm with <10% deviation.
    • The TDF-SR method successfully identified layer thicknesses of 260 μm and 610 μm in polymer bonded explosive (PBX) samples of varying thicknesses (20-40 mm).
    • The TDF-ER method accurately measured layer thicknesses in 50 mm-thick PBX samples.

    Conclusions:

    • The proposed TDF-ER and TDF-SR methods significantly enhance the resolution for thin-layer thickness measurements in thick materials.
    • These methods offer practical solutions for detailed characterization of layered materials using TDS technology.