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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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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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Metamaterial infrared refractometer for determining broadband complex refractive index.

Hibiki Kagami, Tomohiro Amemiya, Makoto Tanaka

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    This study introduces a novel metamaterial infrared refractometer for measuring the complex refractive index. The device enables broadband measurements from 2.5-7.5 µm with high precision.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Metamaterials

    Background:

    • The infrared refractive index is crucial for infrared photonics applications.
    • Existing refractometry methods (critical-angle, V-block, ellipsometry) have limited wavelength ranges up to 2 µm.
    • A need exists for broadband, high-precision infrared refractive index measurement techniques.

    Purpose of the Study:

    • To demonstrate a novel metamaterial infrared refractometer.
    • To enable broadband determination of the complex refractive index in the mid-infrared region.
    • To overcome the wavelength limitations of conventional refractometry.

    Main Methods:

    • Development of a metamaterial-based refractometer.
    • Utilizing the device to measure the complex refractive index.
    • Characterization of polymethyl methacrylate (PMMA) properties.

    Main Results:

    • Successful demonstration of a metamaterial infrared refractometer.
    • Broadband measurement capability from 40-120 THz (2.5-7.5 µm).
    • High-precision complex refractive index measurement (< 5 × 10-3).

    Conclusions:

    • The developed metamaterial refractometer effectively measures broadband complex refractive index.
    • This technology expands the measurable wavelength range for infrared refractometry.
    • The first-time measurement of PMMA's broadband complex refractive index was achieved.