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Related Concept Videos

Standing Waves in a Cavity01:28

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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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Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
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Parallel Resonance

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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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Fabrication of Silica Ultra High Quality Factor Microresonators
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Subwavelength hole defect assisted microring resonator for a compact rectangular filter.

Jiachen Li, Sigang Yang, Hongwei Chen

    Optics Letters
    |June 2, 2020
    PubMed
    Summary
    This summary is machine-generated.

    We developed a novel subwavelength hole defect assisted microring resonator (SHDAMR) for optical filters. This structure achieves a rectangular resonance, improving performance and offering fabrication advantages.

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    Area of Science:

    • Photonics and optical engineering
    • Nanophotonics
    • Integrated optics

    Background:

    • Conventional microring resonators exhibit Lorentzian resonance lineshapes, limiting their performance in certain optical applications.
    • Achieving sharp, rectangular filter shapes in microring resonators is challenging with existing designs.

    Purpose of the Study:

    • To propose and demonstrate a novel microring resonator structure that overcomes the limitations of conventional designs.
    • To achieve a rectangular resonance lineshape in microring resonators for enhanced optical filtering.

    Main Methods:

    • The proposed structure, a subwavelength hole defect assisted microring resonator (SHDAMR), utilizes manipulated modal coupling.
    • A subwavelength hole defect is embedded within the microring waveguide to control mode coupling.
    • The SHDAMR structure is fabricated using a silicon nitride (Si3N4) waveguide platform.

    Main Results:

    • The SHDAMR structure successfully demonstrated a rectangular resonance lineshape, deviating from the typical Lorentzian shape.
    • A fabricated rectangular filter exhibited a 3-dB bandwidth of 2.03 GHz with an improved shape factor.
    • The SHDAMR design offers a compact footprint and simplified tunability.

    Conclusions:

    • The SHDAMR structure provides a viable solution for achieving rectangular optical filters with superior performance.
    • The design exhibits significant tolerance to fabrication errors, enhancing its practical applicability.
    • This technology holds great potential for various integrated photonic applications requiring precise spectral control.