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Related Concept Videos

Design Example: Underdamped Parallel RLC Circuit01:17

Design Example: Underdamped Parallel RLC Circuit

Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
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Fabrication of Silica Ultra High Quality Factor Microresonators
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Published on: July 2, 2012

Estimating surface-roughness loss and output coupling in microdisk resonators.

B E Little, S T Chu

    Optics Letters
    |October 31, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Scattering losses in microdisk and ring resonators due to boundary imperfections are estimated using the volume current method. Phase-matched radiation, driven by the longitudinal electric field, significantly contributes to these losses in high-index contrast devices.

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    Area of Science:

    • Photonics and optical engineering
    • Materials science
    • Electromagnetism

    Background:

    • Microdisk and ring resonators are key components in integrated photonics.
    • Scattering losses limit device performance and are crucial to understand for miniaturization.
    • Surface roughness and boundary corrugations are inherent imperfections in fabricated devices.

    Purpose of the Study:

    • To analytically estimate scattering losses in microdisk and ring resonators.
    • To identify the primary mechanisms responsible for radiation losses due to boundary imperfections.
    • To investigate the influence of device geometry and material properties on loss.

    Main Methods:

    • Utilizing the volume current method for analytical estimation of scattering losses.
    • Analyzing harmonic components of boundary imperfections.
    • Differentiating between phase-matched radiation and tunneling radiation.

    Main Results:

    • The volume current method effectively estimates scattering losses from boundary corrugations and surface roughness.
    • Harmonic components of imperfections can lead to phase-matched radiation or tunneling radiation.
    • Phase-matched radiation is a significant loss contributor, minimally dependent on resonator radius.
    • The longitudinal electric field component dominates radiation losses in high-index contrast devices.

    Conclusions:

    • Scattering losses in microdisk and ring resonators are analytically predictable.
    • Understanding the role of boundary imperfections and electric field components is vital for designing efficient optical resonators.
    • The findings are particularly relevant for high-index contrast photonic integrated circuits.