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Related Experiment Video

Updated: Mar 25, 2026

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
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High contrast circular grating reflector on silicon-on-insulator platform.

Shitao Gao, Yang Wang, Ke Wang

    Optics Letters
    |February 25, 2016
    PubMed
    Summary

    A novel compact circular high contrast grating (HCG) reflector on a silicon-on-insulator platform demonstrates ultra-wide bandwidth and high polarization selectivity. This breakthrough overcomes limitations of conventional gratings for tunable lasers and resonators.

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science
    • Nanotechnology

    Background:

    • Conventional grating reflectors on thin silicon-on-insulator (SOI) platforms exhibit high wavelength selectivity limitations.
    • Compact optical devices are crucial for advanced photonic integrated circuits.

    Purpose of the Study:

    • To propose and experimentally demonstrate a compact circular high contrast grating (HCG) reflector.
    • To overcome the wavelength selectivity limitations of conventional grating reflectors.
    • To achieve high polarization selectivity over a wide wavelength range.

    Main Methods:

    • Fabrication of a circular HCG reflector on a 220 nm SOI platform.
    • Experimental characterization of reflectance, operational bandwidth, and polarization extinction ratio.
    • Utilizing a circular structure to enhance performance in a compact region.

    Main Results:

    • Achieved an ultra-wide operational bandwidth (Δλ) of over 385 nm centered at 1550 nm (Δλ/λ=24.83%).
    • Observed an average reflectance of 94.15% from 1525 to 1610 nm.
    • Demonstrated a polarization extinction ratio greater than 13 dB across the measured wavelength range.

    Conclusions:

    • The proposed circular HCG reflector offers superior performance compared to conventional designs.
    • The device's wide tuning range and high polarization stability are ideal for tunable laser cavities and resonators.
    • This compact HCG reflector is a promising component for advanced photonic applications.