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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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Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation
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Simultaneous multi-frequency topological edge modes between one-dimensional photonic crystals.

Ka Hei Choi, C W Ling, K F Lee

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    |May 19, 2016
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    Summary
    This summary is machine-generated.

    One-dimensional binary photonic crystals can support topological edge modes in all photonic bandgaps. This finding offers a new pathway for robust multi-frequency coupled modes in nonlinear photonics.

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    Area of Science:

    • Condensed matter physics
    • Photonics and optical materials

    Background:

    • Topological edge modes offer robust wave propagation.
    • Photonic crystals provide tunable bandgaps for light manipulation.

    Purpose of the Study:

    • To theoretically investigate the existence of topological edge modes in one-dimensional binary centrosymmetric photonic crystals.
    • To explore the design principles for controlling the location of these modes within photonic bandgaps.

    Main Methods:

    • Theoretical analysis of bulk band topology.
    • Weak dispersion limit approximation for photonic crystals.

    Main Results:

    • Demonstrated that one-dimensional binary centrosymmetric photonic crystals support topological edge modes in all photonic bandgaps.
    • Showed that these 'harmonic' topological edge modes can be designed to exist at bandgaps at the center of the Brillouin zone, zone boundaries, or both.
    • Identified the potential for multi-frequency coupled modes.

    Conclusions:

    • The findings suggest a novel approach for creating robust multi-frequency coupled modes.
    • Potential applications in nonlinear photonics, including frequency upconversion, are highlighted.