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학술지 Bias Field Tailored Plasmonic Nanoelectrode for High-Power Terahertz Photonic Devices
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저자
문기원, 이일민, 신준환, 이의수, 김남제, 이원희, 고현성, 한상필, 박경현
발행일
201509
출처
Scientific Reports, v.5, pp.1-9
ISSN
2045-2322
출판사
Nature Publishing Group
DOI
https://dx.doi.org/10.1038/srep13817
협약과제
14NE5500, 포토닉스 집적회로 기반 테라헤르츠 무선 인터커넥션 기술 개발, 박경현
초록
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.
KSP 제안 키워드
Dominant mechanism, Enhanced absorption, High power, Nano-electrodes, Nano-structured, Plasmonic enhanced, bias field, design and analysis, electrode design, field enhancement, near-field distribution