Bias field tailored plasmonic nano-electrode for high-power terahertz photonic devices

Photoconductive antennas with nano-structured electrodes and which show significantly improved performances have been proposed to satisfy the demand for compact and efficient terahertz (THz) sources. Plasmonic field enhancement was previously considered the dominant mechanism accounting for the impr...

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Bibliographic Details
Published in:Scientific reports 2015-09, Vol.5 (1), p.13817-13817, Article 13817
Main Authors: Moon, Kiwon, Lee, Il-Min, Shin, Jun-Hwan, Lee, Eui Su, Kim, Namje, Lee, Won-Hui, Ko, Hyunsung, Han, Sang-Pil, Park, Kyung Hyun
Format: Article
Language:English
Subjects:
639/624/1020/1095
639/624/399/1016
639/925/927/1021
Design
Electrodes
Geometry
Humanities and Social Sciences
multidisciplinary
Science
Spectrum analysis
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Summary:Photoconductive antennas with nano-structured electrodes and which show significantly improved performances have been proposed to satisfy the demand for compact and efficient terahertz (THz) sources. Plasmonic field enhancement was previously considered the dominant mechanism accounting for the improvements in the underlying physics. However, we discovered that the role of plasmonic field enhancement is limited and near-field distribution of bias field should be considered as well. In this paper, we clearly show that the locally enhanced bias field due to the size effect is much more important than the plasmonic enhanced absorption in the nano-structured electrodes for the THz emitters. Consequently, an improved nano-electrode design is presented by tailoring bias field distribution and plasmonic enhancement. Our findings will pave the way for new perspectives in the design and analysis of plasmonic nano-structures for more efficient THz photonic devices.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep13817