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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

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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Reflective-type guided-mode resonance sensor system based on interference line fringe shifting.

Wen-Kai Kuo, Yi-Jyun Zeng, Ping-Yang Chen

    Optics Express
    |December 19, 2025
    PubMed
    Summary

    This study introduces a novel refractive index (RI) sensing system using a guided-mode resonance (GMR) sensor. The system achieves high sensitivity for detecting RI changes, showing potential for advanced biosensing applications.

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    Area of Science:

    • Optoelectronics
    • Nanophotonics
    • Biosensing

    Background:

    • Refractive index (RI) sensing is crucial for various applications, including chemical analysis and biological detection.
    • Previous methods often relied on spectrometers or image sensors to detect RI changes.
    • Guided-mode resonance (GMR) sensors offer label-free detection capabilities.

    Purpose of the Study:

    • To propose and demonstrate a novel reflective-type GMR sensing system.
    • To utilize a bi-cell photodiode for detecting interference bright fringe line shifts.
    • To achieve a low-cost, compact, and highly sensitive RI sensing system.

    Main Methods:

    • A converging laser beam was focused onto a reflective-type GMR sensor.
    • The reflected light formed a bright fringe line on a bi-cell photodiode.
    • RI changes on the sensor surface caused the bright fringe line to shift, detected via differential photodiode voltages.

    Main Results:

    • The proposed system demonstrated an average detection sensitivity of 15.8 V/RIU.
    • The method successfully detected RI changes in aqueous sugar solutions.
    • The system proved to be low-cost and compact.

    Conclusions:

    • The reflective-type GMR sensor with a bi-cell photodiode offers a sensitive RI detection method.
    • This approach presents excellent potential for developing cost-effective and compact biosensors.
    • The bright fringe line shift detection is a viable alternative to traditional methods.