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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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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Highly efficient vertical coupling to a topological waveguide with defect structure.

Hibiki Kagami, Tomohiro Amemiya, Sho Okada

    Optics Express
    |November 23, 2021
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a defect structure to boost light coupling in topological waveguides. This innovation significantly improves vertical coupling efficiency for circularly polarized light across the telecom C band.

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    Area of Science:

    • Photonics and Nanophotonics
    • Condensed Matter Physics

    Background:

    • Topological waveguides offer robust light propagation.
    • Efficient coupling of light into these waveguides is crucial for device applications.
    • Circularly polarized light is important for certain optical functionalities.

    Purpose of the Study:

    • To enhance the vertical coupling efficiency of circularly polarized light into topological waveguides.
    • To investigate the role of defect structures in improving optical coupling.
    • To demonstrate control over the coupling efficiency wavelength.

    Main Methods:

    • Fabrication of topological waveguides with C6v symmetric triangle nanoholes in a honeycomb lattice.
    • Introduction of a defect structure by removing specific nanoholes.
    • Three-dimensional finite-difference time-domain (FDTD) analysis to simulate and compare coupling efficiency with and without the defect.

    Main Results:

    • Significant improvement in vertical coupling efficiency (up to 4460% at 1530 nm) was observed with the defect structure.
    • The enhanced coupling efficiency was demonstrated across the entire telecom C band.
    • The wavelength of maximum coupling efficiency could be tuned by altering the dielectric arrangement around the defect.

    Conclusions:

    • The proposed defect structure effectively enhances vertical coupling efficiency for circularly polarized light in topological waveguides.
    • This approach provides a method for controlling coupling characteristics, enabling wavelength tunability.
    • The findings have implications for developing advanced photonic devices and integrated optical systems.