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김대식

Kim, Dai-Sik
Nano Optics Group
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dc.citation.endPage 3167 -
dc.citation.number 13 -
dc.citation.startPage 3159 -
dc.citation.title NANOPHOTONICS -
dc.citation.volume 11 -
dc.contributor.author Jeong, Jeeyoon -
dc.contributor.author Kim, Dai-Sik -
dc.contributor.author Park, Hyeong-Ryeol -
dc.date.accessioned 2023-12-21T14:08:40Z -
dc.date.available 2023-12-21T14:08:40Z -
dc.date.created 2022-06-03 -
dc.date.issued 2022-06 -
dc.description.abstract Metallic nanogaps are being widely used for sensing applications, owing to their ability to confine and enhance electromagnetic field within the hot spots. Since the enhanced field does not confine itself perfectly within the gap, however, fringe fields well away from the gap are of potential use as well in real systems. Here, we extend the concept of near field absorption enhancement by quantitatively analyzing terahertz absorption behavior of water molecules outside the hot spots of sub-20 nm-wide, similar to 100 mu m-long nanotrenches. Contrary to point-gaps which show negligible field enhancement at distances larger than the gap width, our extended nanogap act as a line source, incorporating significant amount of absorption enhancement at much longer distances. We observe absorption enhancement factors of up to 3600 on top of a 5 nm-wide gap, and still well over 300 at 15 nm away. The finding is well supported by theoretical analyses including modal expansion calculations, Kirchhoff integral formalism and antenna theory. Our results provide means to quantitatively analyze light-matter interactions beyond the hot spot picture and enable application of nanogaps for sensitive surface analyses of various material systems. -
dc.identifier.bibliographicCitation NANOPHOTONICS, v.11, no.13, pp.3159 - 3167 -
dc.identifier.doi 10.1515/nanoph-2022-0214 -
dc.identifier.issn 2192-8606 -
dc.identifier.scopusid 2-s2.0-85131123095 -
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/58639 -
dc.identifier.url https://www.degruyter.com/document/doi/10.1515/nanoph-2022-0214/html -
dc.identifier.wosid 000799973400001 -
dc.language 영어 -
dc.publisher WALTER DE GRUYTER GMBH -
dc.title Beyond-hot-spot absorption enhancement on top of terahertz nanotrenches -
dc.type Article -
dc.description.isOpenAccess TRUE -
dc.relation.journalWebOfScienceCategory Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Optics; Physics, Applied -
dc.relation.journalResearchArea Science & Technology - Other Topics; Materials Science; Optics; Physics -
dc.type.docType Article; Early Access -
dc.description.journalRegisteredClass scie -
dc.description.journalRegisteredClass scopus -
dc.subject.keywordAuthor absorption -
dc.subject.keywordAuthor field enhancement -
dc.subject.keywordAuthor hot spots -
dc.subject.keywordAuthor nanogaps -
dc.subject.keywordAuthor terahertz -
dc.subject.keywordPlus QUANTUM PLASMONICS -
dc.subject.keywordPlus FIELD ENHANCEMENT -
dc.subject.keywordPlus NANOANTENNAS -
dc.subject.keywordPlus ANTENNAS -

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