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Related Experiment Videos

Waveguide-coupled octagonal microdisk channel add-drop filters.

Chao Li1, Ning Ma, Andrew W Poon

  • 1Department of Electrical and Electronic Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China.

Optics Letters
|March 10, 2004
PubMed
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We demonstrate novel octagonal microdisk filters on silicon nitride, achieving efficient light coupling. These filters show promise for integrated optical circuits, validated by experimental and simulation results.

Area of Science:

  • Photonics and Optical Engineering
  • Materials Science

Background:

  • Integrated optical devices are crucial for modern communication systems.
  • Microdisk resonators offer compact solutions for wavelength-selective filtering.
  • Silicon nitride on silica offers a robust platform for photonic integrated circuits.

Purpose of the Study:

  • To report the design and experimental demonstration of planar waveguide-coupled octagonal microdisk channel add-drop filters.
  • To investigate the ray optics of octagonal cavities and their mode behavior.
  • To validate simulation results with experimental data for these novel filters.

Main Methods:

  • Fabrication of octagonal microdisk filters on silicon nitride-on-silica substrates.
  • Ray optics analysis to understand cavity modes.

Related Experiment Videos

  • Experimental characterization of a 50-microm-sized filter, measuring coupling efficiency, Q factor, and finesse.
  • Two-dimensional finite-difference time-domain (FDTD) method for simulation.

    • Main Results:

    • Demonstrated waveguide-coupled octagonal microdisk filters with efficient TM-polarized eight-bounce modes.
    • Achieved a coupling efficiency of approximately 56%, a Q factor of approximately 1150, and a finesse of approximately 5.
    • Obtained qualitative agreement between experimental measurements and 2D FDTD simulations.

    Conclusions:

    • Octagonal microdisk cavities support wave-front-matched ray orbits, enabling efficient light coupling.
    • The demonstrated filters are suitable for integrated optical add-drop multiplexing applications.
    • The results validate the use of ray optics and FDTD for designing such photonic devices.