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Related Experiment Video

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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Microlensless interdigitated photoconductive terahertz emitters.

Abhishek Singh, S S Prabhu

    Optics Express
    |April 4, 2015
    PubMed
    Summary
    This summary is machine-generated.

    We developed novel plasmonic interdigitated photoconductive antennas (iPCA) for terahertz (THz) emission. This design enhances THz radiation power and reduces fabrication costs for THz sources and detectors.

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    Area of Science:

    • Optoelectronics
    • Terahertz (THz) Photonics
    • Plasmonics

    Background:

    • Photoconductive antennas (PCAs) are crucial for generating terahertz (THz) radiation.
    • Traditional PCAs often require microlens arrays for precise photoexcitation to prevent destructive interference.
    • Scaling up optical excitation in PCAs can lead to saturation effects, limiting output power.

    Purpose of the Study:

    • To fabricate and characterize novel interdigitated photoconductive antennas (iPCAs) utilizing plasmonic electrode designs.
    • To demonstrate an iPCA design that eliminates the need for microlens arrays.
    • To investigate the performance enhancement of plasmonic iPCAs compared to single-region PCAs.

    Main Methods:

    • Fabrication of interdigitated photoconductive antennas (iPCAs) with integrated plasmonic electrodes.
    • Optical photoexcitation of the iPCAs.
    • Measurement of emitted terahertz (THz) radiation power at varying optical excitation densities.

    Main Results:

    • The novel iPCA design functions effectively without microlens arrays, simplifying the setup.
    • The plasmonic iPCAs demonstrate approximately double the THz radiation power compared to single-region plasmonic PCAs at 200 mW optical excitation.
    • The larger area photoexcitation capability of iPCAs mitigates saturation effects at higher optical powers.

    Conclusions:

    • Plasmonic iPCAs offer a significant advancement in terahertz (THz) emitter technology.
    • This innovative design enhances THz output power and allows for higher optical excitation densities.
    • The fabrication of these iPCAs is expected to lower the production costs of photoconductive THz sources and detectors.