Terahertz nanogap antenna for detection of nano-rods

Hyeongryeol 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 (US)
Title of host publication34th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2009
DOIs
StatePublished - Dec 31 2009
Event34th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2009 - Busan, Korea, Republic of
Duration: Sep 21 2009Sep 25 2009

Other

Other34th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2009
CountryKorea, Republic of
CityBusan
Period9/21/099/25/09

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