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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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Compact resonant 2 × 2 crossbar switch using three coupled waveguides with a central nanobeam.

Richard Soref, Francesco De Leonardis, Vittorio M N Passaro

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science
    • Nanotechnology

    Background:

    • Optical switching is crucial for modern communication networks.
    • Existing solutions face limitations in size, power consumption, and integration.

    Purpose of the Study:

    • To theoretically design and simulate novel 2x2 optical crossbar switches using silicon-on-insulator (SOI) and germanium-on-nitride platforms.
    • To evaluate their performance metrics for potential use in wavelength-division-multiplexed cross-connect (WXC) systems.

    Main Methods:

    • Utilized a three-waveguide coupler with a thermo-optical (TO) actuated nanobeam.
    • Employed the 3D finite difference time domain (FDTD) approach for accurate design and simulation.
    • Evaluated insertion loss (IL) and crosstalk (CT) by varying structural parameters and TO-induced index changes.

    Main Results:

    • Achieved excellent predicted insertion loss (IL) and crosstalk (CT) performance.
    • Demonstrated the feasibility of compact, nonblocking space-and-wavelength routing switches.
    • Projected designs suitable for monolithic, industry-standard SOI and Ge-on-nitride chip integration.

    Conclusions:

    • The designed optical crossbar switches are fundamental building blocks for wavelength-division-multiplexed cross-connect (WXC) applications.
    • The proposed devices offer compact, reconfigurable, and high-performance routing capabilities.
    • These switches pave the way for advanced WXC architectures, including programmable hexagonal and diamond meshes.