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Related Experiment Video

Updated: May 1, 2026

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
10:54

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

Published on: July 8, 2013

14.4K

Terahertz spoof plasmonic coaxial microcavity.

Zaihe Yu, Zhen Gao, Zhengyong Song

    Applied Optics
    |March 26, 2014
    PubMed
    Summary

    We demonstrate a novel terahertz microcavity using spoof surface-plasmon-polaritons (SPPs) for high-quality factor and ultra-small mode volume. This plasmonic device offers tunable resonance for advanced optical applications.

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    Area of Science:

    • Plasmonics and Metamaterials
    • Terahertz Science and Technology

    Background:

    • Surface-plasmon-polaritons (SPPs) are electromagnetic waves confined to metallic surfaces.
    • Terahertz (THz) frequencies offer unique properties for spectroscopy and communication.
    • Subwavelength confinement is crucial for miniaturizing optical devices.

    Purpose of the Study:

    • To theoretically demonstrate a subwavelength microcavity for terahertz spoof SPPs.
    • To achieve a high-quality factor (Q factor) and ultra-small mode volume.
    • To explore the tunability of the microcavity for various applications.

    Main Methods:

    • Theoretical demonstration of a microcavity structure.
    • Utilizing plasmonic and metamaterial principles.
    • Designing a circular aperture with a bell-shaped metallic core.

    Main Results:

    • Achieved a Q factor of 1000 and a mode volume of 0.00018(λ/2)³ at room temperature.
    • Demonstrated tight confinement of SPP eigenmodes within the microcavity.
    • Showcased flexible tuning of resonance frequency by geometric modification.

    Conclusions:

    • The proposed microcavity offers a promising platform for terahertz applications.
    • Its high Q factor and small mode volume are suitable for filters, light sources, and on-chip communications.
    • The design is manufacturable and tunable, enhancing its practical potential.

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