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Effective-zero-thickness terahertz slot antennas using stepped structures

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Title
Effective-zero-thickness terahertz slot antennas using stepped structures
Author
Yun, Hyeong SeokLee, DukhyungKim, Dai-Sik
Issue Date
2021-07
Publisher
OPTICAL SOC AMER
Citation
OPTICS EXPRESS, v.29, no.14, pp.21262 - 21268
Abstract
Metallic nanostructures play an essential role in electromagnetic manipulations due to the localization and enhancement of electromagnetic waves in nanogaps. Scaling down the dimensions of the gap, such as the gap width and the thickness, is an effective way to enhance light-matter interaction with colossal field enhancement. However, reducing the thickness below 10 nanometers still suffers from fabrication difficulty and unintended direct transmission through metals. Here, we fabricate effective-zero-thickness slot antennas by stepping metals in the vicinity of the gaps to confine electromagnetic waves in tiny volumes. We analyze and simulate terahertz transmission, and demonstrate the absorption enhancement of molecules in the slot antennas. Our fabrication technique provides a simple but versatile tool for maximum field enhancement and molecular sensing. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
URI
https://scholarworks.unist.ac.kr/handle/201301/53867
URL
https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-29-14-21262&id=452665
DOI
10.1364/OE.427061
ISSN
1094-4087
Appears in Collections:
PHY_Journal Papers
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