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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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Related Experiment Video

Updated: Jun 19, 2026

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

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

Single-mode waveguide microcavity for fast optical switching.

P R Villeneuve, D S Abrams, S Fan

    Optics Letters
    |November 3, 2009
    PubMed
    Summary
    This summary is machine-generated.

    We demonstrate a compact waveguide microcavity for optical switching and modulation. Using the photorefractive effect in semiconductors, we achieve picosecond switching times with low energy consumption.

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    Area of Science:

    • Photonics and optical engineering
    • Semiconductor device physics
    • Materials science

    Background:

    • Tunable microcavities are crucial for optical signal processing.
    • Existing methods for tuning microcavities often face limitations in speed or energy efficiency.
    • Photorefractive effects in semiconductors offer a potential mechanism for dynamic refractive index modulation.

    Purpose of the Study:

    • To investigate the properties of a tunable single-mode waveguide microcavity.
    • To explore the use of the photorefractive effect for tuning microcavity resonance.
    • To assess the potential for high-speed optical switching applications.

    Main Methods:

    • Fabrication and characterization of a single-mode waveguide microcavity.
    • Utilizing the photorefractive effect, specifically photoionization of DX centers in compound semiconductors, for refractive index modulation.
    • Configuring two microcavities in series to create an optical switch.

    Main Results:

    • The microcavity exhibits a mode volume significantly smaller than one cubic half-wavelength.
    • Resonant frequency tuning is achieved via refractive index modulation.
    • Picosecond on-off switching times were demonstrated with the series-coupled cavity configuration.

    Conclusions:

    • The proposed tunable waveguide microcavity is suitable for frequency modulation and switching.
    • The photorefractive effect provides an effective method for dynamic tuning.
    • The developed optical switch is compact, energy-efficient (10 pJ), and operates at high speeds.