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Updated: May 18, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Published on: April 4, 2017

Unidirectionally optical coupling from free space into silicon waveguide with wide flat-top angular efficiency.

Kun Li1, Guangyuan Li, Feng Xiao

  • 1State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronics Engineering and Computer Science, Peking University, Beijing, China.

Optics Express
|October 6, 2012
PubMed
Summary
This summary is machine-generated.

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We developed a new grating coupler for silicon waveguides that achieves a wide, flat-top angular efficiency. This innovation significantly broadens the coupling angle, enhancing performance for optical devices.

Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Efficient coupling of free-space light into silicon waveguides is crucial for integrated optics.
  • Existing grating couplers often suffer from narrow angular acceptance bandwidths.

Purpose of the Study:

  • To propose and theoretically investigate a novel grating coupling scheme.
  • To achieve a wide flat-top angular efficiency for enhanced light coupling into silicon waveguides.

Main Methods:

  • Development of a quantitative semi-analytical theory based on coupled-mode models.
  • Validation using the fully vectorial aperiodic Fourier modal method (a-FMM).
  • Design of a coupling structure with two cascaded gratings.

Main Results:

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  • Achieved a wide flat-top angular response by optimizing grating parameters.
  • Broadened the -1 dB angular width by 3 to 4 times compared to reference gratings.
  • Increased the -3 dB angular width (angular-full-width-half-maximum) by more than twice.

    • Conclusions:

    • The proposed cascaded grating coupler offers significantly improved angular acceptance.
    • This technique is promising for applications in biosensing, chemical sensing, and novel optical devices.