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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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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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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
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Dispersion tailoring in wedge microcavities for Kerr comb generation.

L Fujii, M Inga, J H Soares

    Optics Letters
    |June 16, 2020
    PubMed
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    Researchers engineered silica wedge microdisks to control group velocity dispersion for generating wideband optical frequency combs. This technique enables tunable dispersion, crucial for broadband Kerr frequency comb generation in microresonators.

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    Area of Science:

    • Photonics
    • Optical Engineering
    • Materials Science

    Background:

    • Group velocity dispersion (GVD) management is critical for generating wideband optical frequency combs in microresonators.
    • Small microresonators with tight bending radii offer a large free spectral range (FSR) for comb formation but typically enhance normal GVD, limiting comb bandwidth.
    • Existing methods for dispersion engineering often impact the FSR, which is undesirable for wide comb generation.

    Purpose of the Study:

    • To demonstrate a method for tuning group velocity dispersion in small-radius microresonators without significantly affecting the free spectral range.
    • To enable both normal and anomalous dispersion regimes through microdisk geometry modification.
    • To generate a wideband Kerr optical frequency comb using the engineered microdisk.

    Main Methods:

    • Fabrication of small-radius (∼100µm), 3-µm-thick silica wedge microdisks with engineered sidewall angles.
    • Experimental characterization of the group velocity dispersion and free spectral range of the fabricated microdisks.
    • Generation of a Kerr optical frequency comb using a microdisk exhibiting anomalous dispersion.

    Main Results:

    • Engineering the sidewall angle of silica wedge microdisks allows for precise tuning of group velocity dispersion.
    • Both normal and anomalous dispersion regimes were achieved without significant alteration of the free spectral range.
    • A 300 nm bandwidth Kerr optical frequency comb was successfully demonstrated using a microdisk with a 55° wedge angle (anomalous dispersion).

    Conclusions:

    • Sidewall angle engineering of silica wedge microdisks is an effective strategy for dispersion control in microresonator-based frequency comb generation.
    • This method provides a pathway to overcome the limitations of normal GVD in small-radius resonators.
    • The demonstrated technique facilitates the generation of wideband Kerr optical frequency combs, important for various photonic applications.