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Related Experiment Video

Updated: Mar 18, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

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Broadband fiber-chip zero-order surface grating coupler with 0.4  dB efficiency.

Alejandro Sánchez-Postigo, J Gonzalo Wangüemert-Pérez, José Manuel Luque-González

    Optics Letters
    |July 2, 2016
    PubMed
    Summary
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    This study introduces a novel zero-order surface grating coupler for efficient light coupling in nanophotonic waveguides. The design achieves high coupling efficiency and broadband operation by utilizing subwavelength structures and a silicon prism, overcoming limitations of conventional couplers.

    Area of Science:

    • Nanophotonics
    • Integrated Optics
    • Waveguide Technology

    Background:

    • Surface grating couplers are crucial for interfacing optical fibers with nanophotonic waveguides.
    • Conventional grating couplers suffer from wavelength-dependent radiation angles, limiting operational bandwidth.

    Purpose of the Study:

    • To present a zero-order surface grating coupler with enhanced bandwidth and efficiency.
    • To overcome the wavelength dependency limitation of traditional grating couplers.

    Main Methods:

    • Operating the grating coupler in the subwavelength regime.
    • Engineering the effective refractive index of the grating.
    • Utilizing a silicon prism to direct light upwards and reduce substrate loss.
    • Employing linear apodization for design optimization.

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    Related Experiment Videos

    Last Updated: Mar 18, 2026

    Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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    Published on: November 30, 2012

    19.6K
    Writing Bragg Gratings in Multicore Fibers
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    Writing Bragg Gratings in Multicore Fibers

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    8.7K
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    Main Results:

    • Achieved a high coupling efficiency of 91% (-0.41 dB).
    • Demonstrated a broadband 1-dB operation bandwidth of 126 nm.
    • Successfully overcame the intrinsic wavelength dependency of radiation angles.

    Conclusions:

    • The developed zero-order surface grating coupler offers a promising solution for broadband light coupling in nanophotonics.
    • The subwavelength operation and prism-assisted design are key to achieving high efficiency and wide bandwidth.