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Title: Greatly enhanced continuous-wave terahertz emission by nano-electrodes in a photoconductive photomixer
Authors: Tanoto, H.
Teng, J.H.
Wu, Q.Y.
Sun, M.
Chen, Z.N.
Maier, S.A.
Wang, B.
Chum, C.C.
Si, G.Y.
Danner, A.J. 
Chua, S.J. 
Issue Date: Feb-2012
Citation: Tanoto, H.,Teng, J.H.,Wu, Q.Y.,Sun, M.,Chen, Z.N.,Maier, S.A.,Wang, B.,Chum, C.C.,Si, G.Y.,Danner, A.J.,Chua, S.J. (2012-02). Greatly enhanced continuous-wave terahertz emission by nano-electrodes in a photoconductive photomixer. Nature Photonics 6 (2) : 121-126. ScholarBank@NUS Repository.
Abstract: An efficient, room-temperature-operation continuous-wave terahertz source will greatly benefit compact terahertz system development for high-resolution terahertz spectroscopy and imaging applications. Here, we report highly efficient continuous-wave terahertz emission using nanogap electrodes in a photoconductive antenna-based photomixer. The tip-to-tip nanogap electrode structure provides strong terahertz field enhancement and acts as a nano-antenna to radiate the terahertz wave generated in the active region of the photomixer. In addition, it provides good impedance-matching to the terahertz planar antenna and exhibits a lower RC time constant, allowing more efficient radiation, especially at the higher part of the terahertz spectrum. As a result, the output power of the photomixer with the new nanogap electrode structure in the active region is two orders of magnitude higher than for a photomixer with typical interdigitated electrodes. The terahertz emission bandwidth also increases by a factor of more than two. © 2012 Macmillan Publishers Limited. All rights reserved.
Source Title: Nature Photonics
ISSN: 17494885
DOI: 10.1038/nphoton2011322
Appears in Collections:Staff Publications

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