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Related Experiment Video

Updated: May 3, 2026

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Guided-mode resonant coherent light absorbers.

J A Giese, J W Yoon, B R Wenner

    Optics Letters
    |February 4, 2014
    PubMed
    Summary

    Researchers developed novel coherent perfect absorbers using guided-mode resonance in semiconductor films. Optimized amorphous silicon gratings achieve near 100% light absorption at 1550 nm, advancing optical device technology.

    Area of Science:

    • Photonics and optical engineering
    • Materials science

    Background:

    • Coherent perfect absorbers (CPAs) are crucial for advanced optical applications.
    • Guided-mode resonance (GMR) in thin films offers a pathway to enhance light-matter interactions.

    Purpose of the Study:

    • To design and demonstrate a new class of coherent perfect absorbers.
    • To maximize light absorption in thin semiconductor films using GMR.

    Main Methods:

    • Utilized particle-swarm optimization (PSO) for device design.
    • Fabricated a thin-film amorphous silicon grating structure.
    • Investigated guided-mode resonance phenomena.

    Main Results:

    • Achieved a maximum scattering power of approximately 94%.

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  • Demonstrated a power absorption limit approaching 100% at a 1550-nm wavelength.
  • The optimized grating effectively modulated absorbance coherently.

    • Conclusions:

    • The developed GMR-based CPA in amorphous silicon represents a significant advancement.
    • The device shows potential for highly efficient light absorption applications.
    • Optimized thin-film gratings are effective for achieving near-perfect absorption.