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Related Concept Videos

Parallel Resonance01:23

Parallel Resonance

The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:

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Related Experiment Video

Updated: Jun 22, 2026

Fabrication of Silica Ultra High Quality Factor Microresonators
07:51

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Published on: July 2, 2012

Ultra-compact microdisk resonator filters on SOI substrate.

Alain Morand, Yang Zhang, Bruno Martin

    Optics Express
    |June 18, 2009
    PubMed
    Summary

    This study explores silicon microdisk resonators coupled to waveguides. Researchers achieved high quality factors and demonstrated their use as efficient stop-band filters and wavelength-demultiplexers.

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    Area of Science:

    • Photonics
    • Optical Engineering
    • Materials Science

    Background:

    • Silicon microdisks offer high refractive index contrast for enhanced optical properties.
    • Evanescent coupling is a key mechanism for integrating microdisk resonators with waveguides.

    Purpose of the Study:

    • To investigate the evanescent coupling of silicon microdisks with Silicon-On-Insulator waveguides.
    • To characterize the optical performance of microdisk resonators as filters and wavelength-demultiplexers.

    Main Methods:

    • Fabrication of silicon microdisks with a 1.5 µm radius.
    • Evanescent coupling experiments with one or two Silicon-On-Insulator waveguides.
    • Transmission measurements across the 1500-1600 nm wavelength range.

    Main Results:

    • Achieved the highest quality factor for microdisks in the 1500-1600 nm range.
    • Demonstrated stop-band filter behavior with critical coupling and a 1.63 nm linewidth.
    • Observed a 20 dB transmission decrease.
    • Configured the microdisk as a compact symmetric wavelength-demultiplexer.

    Conclusions:

    • Silicon microdisk resonators are highly effective for optical filtering and wavelength-demultiplexing applications.
    • Critical coupling is achievable, enabling narrow linewidths.
    • The performance of the wavelength-demultiplexer depends on the waveguide-resonator gap and desired linewidth.