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Related Experiment Video

Updated: May 13, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

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Published on: November 30, 2012

Highly efficient optical filter based on vertically coupled photonic crystal cavity and bus waveguide.

Kapil Debnath1, Karl Welna, Marcello Ferrera

  • 1School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, UK. kd343@st‑andrews.ac.uk

Optics Letters
|March 5, 2013
PubMed
Summary

We developed a novel optical filter using vertically coupled photonic crystal cavities on silicon. This design achieves high extinction ratios and low insertion loss for advanced photonic devices.

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science
  • Nanotechnology

Background:

  • Photonic crystal (PhC) cavities are crucial for advanced optical filters.
  • Existing designs often face challenges with insertion loss and coupling efficiency.
  • Silicon-on-insulator (SOI) is a key platform for integrated photonics.

Purpose of the Study:

  • To demonstrate a new optical filter design.
  • To leverage vertical coupling for improved performance.
  • To achieve high extinction ratios in PhC-based filters.

Main Methods:

  • Experimental demonstration of a novel optical filter.
  • Monolithic integration of a vertically coupled PhC cavity and bus waveguide on SOI.
  • Utilizing vertical coupling for enhanced light interaction with resonators.

Main Results:

  • Achieved very high coupling efficiencies to wavelength-scale resonators.
  • Dramatically lowered insertion loss compared to conventional methods.
  • Demonstrated PhC-based optical filters with a high extinction ratio (>10 dB).

Conclusions:

  • The vertically coupled PhC cavity design offers superior performance for optical filters.
  • This approach provides flexibility in waveguide design and material choice.
  • Enables the creation of high-performance, low-loss integrated photonic devices.