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Kim, Dai-Sik
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High Contrast Detection of Water-Filled Terahertz Nanotrenches

DC Field Value Language Jeong, Jeeyoon ko Yun, Hyeong Seok ko Kim, Dasom ko Lee, Kang Sup ko Choi, Han-Kyu ko Kim, Zee Hwan ko Lee, Sang Woon ko Kim, Dai-Sik ko 2019-05-14T06:29:15Z - 2019-03-11 ko 2018-11 ko
dc.identifier.citation ADVANCED OPTICAL MATERIALS, v.6, no.21, pp.1800582 ko
dc.identifier.issn 2195-1071 ko
dc.identifier.uri -
dc.description.abstract The convergence of nano-optics with an aqueous environment is promising for future chemical or biological applications. While the rapid development in nanofabrication has led to the realization of sub-10 nm nanogaps of various structures, coupling water into high aspect ratio metallic nanogaps with a well-defined area is not yet demonstrated. Here, arrays of 10 nm wide metallic trenches are reported filled with dielectric, air, liquid water, and various molecules in optical hotspots. Due to the high height-to-width aspect ratio of 20:1 and strong gap plasmon coupling in the 10 nm width, the trenches show distinct spectral changes at terahertz frequencies under changing gap materials, from which the full etching and water filling of the 10 nm gap can be unambiguously confirmed. A 75% transmitted amplitude decrease is observed through 200 nm deep trenches upon water filling, which converts to an effective 1100-fold increase in the water absorption coefficient. The gap-filling scheme can be applied to distinguish different liquids with 400 attoliters of volume or to detect rhodamine 6G molecules inside the gap with surface-enhanced Raman scattering. Accordingly, the scheme can also be applied to a general class of polar organic molecules suitable for various biological or chemical applications. ko
dc.language 영어 ko
dc.publisher WILEY-V C H VERLAG GMBH ko
dc.title High Contrast Detection of Water-Filled Terahertz Nanotrenches ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-85052830585 ko
dc.identifier.wosid 000449767800003 ko
dc.type.rims ART ko
dc.identifier.doi 10.1002/adom.201800582 ko
dc.identifier.url ko
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