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Updated: Jul 31, 2025

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Plasmonic wavelength-dependent optical switch.

Deirdre Kilbane, Eva Prinz, Tobias Eul

    Optics Express
    |May 9, 2023
    PubMed
    Summary
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    Researchers developed a novel optical switch using plasmonic interference in whispering gallery mode (WGM) antennas. This device switches light fields by tuning the excitation wavelength, enabling new photonic applications.

    Area of Science:

    • Photonics and Nanotechnology
    • Plasmonics
    • Optical Switching

    Background:

    • Whispering gallery mode (WGM) resonators offer unique light confinement properties.
    • Plasmonic antennas enable manipulation of light at the nanoscale.
    • Developing efficient optical switches is crucial for advanced photonic circuits.

    Purpose of the Study:

    • To design and demonstrate a novel optical switch.
    • To utilize the interference of plasmonic modes in WGM antennas for switching.
    • To achieve wavelength-tunable switching of plasmonic near fields.

    Main Methods:

    • Design of WGM antennas with engineered symmetry.
    • Non-normal illumination for simultaneous excitation of even and odd WGM modes.
    • Experimental demonstration using photoemission electron microscopy (PEEM) and a tunable femtosecond laser.

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    Last Updated: Jul 31, 2025

    Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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    Published on: July 8, 2013

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    Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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    Evaluating Plasmonic Transport in Current-carrying Silver Nanowires
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    Published on: December 11, 2013

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    Main Results:

    • Demonstrated wavelength-tunable switching of plasmonic near fields.
    • Achieved switching over a 60 nm wavelength range centered around 790 nm.
    • Confirmed the mechanism by observing near-field localization on opposite sides of the antenna.

    Conclusions:

    • The proposed WGM antenna design enables efficient optical switching.
    • Interference of plasmonic modes provides a viable mechanism for nanoscale light control.
    • This work opens avenues for miniaturized and tunable photonic devices.