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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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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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Refractive index sensor based on a ring with a disk-shaped cavity for temperature detection applications.

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    This study introduces a novel metal-insulator-metal refractive index sensor. The sensor achieves high sensitivity and figure of merit, showing potential for temperature detection.

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    Area of Science:

    • Photonics and Nanotechnology
    • Optical Sensing

    Background:

    • Refractive index sensors are crucial for various applications.
    • Metal-insulator-metal (MIM) waveguides offer unique optical properties.

    Purpose of the Study:

    • To propose and analyze a novel refractive index sensor structure.
    • To investigate the influence of structural parameters on sensor performance.

    Main Methods:

    • Theoretical analysis using the finite element method.
    • Simulation of a metal-insulator-metal waveguide with a circular ring containing a disk-shaped cavity (CRDC).

    Main Results:

    • The disk-shaped cavity is identified as key for asymmetric Fano resonance.
    • CRDC radius significantly impacts sensor performance.
    • Achieved maximum sensitivity of 2240 nm/RIU and figure of merit (FOM) of 62.5.
    • Demonstrated potential for temperature detection with a sensitivity of 1.186 nm/ºC.

    Conclusions:

    • The proposed CRDC structure enables high-performance refractive index sensing.
    • The sensor design is simple and shows promise for dual-mode sensing (refractive index and temperature).