Terahertz nanogap antenna for detection of nano-rods

H. R. Park, M. A. Seo, J. S. Kyoung, J. H. Kang, Q. Han Park, O. K. Suwal, S. S. Choi, S. M. Koo, N. K. Park, D. S. Kim

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    We have measured transmission properties of a composite structure consisting of nano-rods on a long (ay=300 micron) nano gap (70 nm) on Au film in broad frequency range of 0.1 THz to 1.0 THz using THz time-domain spectroscopy. The normalized transmittance with no nano-bridge or nano-rod structure in the middle shows a half-wavelength resonance: the resonance frequency is ∼c/(2nay) where n is the index of refraction of the substrate. The nano-size bridge at the center of the nano gap gives changes the resonance characteristics profoundly, because in essence, the length a y now halves. Mostly the same resonance-changing behavior is expected with a nano-rod structure fabricated by Pt-deposition method using a focused ion beam (FIB). This small rod also acts as a bridge dividing the length of the rectangle. The structure dependent resonance allows to detect nano-size particles and to tailor resonance characteristics with feature sizes of λ/10,000.

    Original languageEnglish
    Title of host publication34th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2009
    DOIs
    Publication statusPublished - 2009
    Event34th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2009 - Busan, Korea, Republic of
    Duration: 2009 Sept 212009 Sept 25

    Publication series

    Name34th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2009

    Other

    Other34th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2009
    Country/TerritoryKorea, Republic of
    CityBusan
    Period09/9/2109/9/25

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Communication

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