Related Researcher

Author's Photo

Kim, Dai-Sik
Research Interests


Enhanced terahertz conductivity in ultra-thin gold film deposited onto (3-mercaptopropyl) trimethoxysilane (MPTMS)-coated Si substrates

DC Field Value Language Lee, Youjin ko Kim, Dasom ko Jeong, Jeeyoon ko Kim, Jugyoung ko Shmid, Volodymyr ko Korotchenkov, Oleg ko Vasa, Parinda ko Bahk, Young-Mi ko Kim, Dai-Sik ko 2020-04-16T09:23:11Z - 2019-11-04 ko 2019-10 ko
dc.identifier.citation SCIENTIFIC REPORTS, v.9, pp.15025 ko
dc.identifier.issn 2045-2322 ko
dc.identifier.uri -
dc.description.abstract Various material properties change considerably when material is thinned down to nanometer thicknesses. Accordingly, researchers have been trying to obtain homogeneous thin films with nanometer thickness but depositing homogeneous few nanometers thick gold film is challenging as it tends to form islands rather than homogenous film. Recently, studies have revealed that treating the substrate with an organic buffer, (3-mercaptopropyl) trimethoxysilane (MPTMS) enables deposition of ultra-thin gold film having thickness as low as 5 nm. Different aspects of MPTMS treatment for ultrathin gold films like its effect on the structure and optical properties at visible wavelengths have been investigated. However, the effect of the MPTMS treatment on electrical conductivity of ultra-thin gold film at terahertz frequency remains unexplored. Here, we measure the complex conductivity of nanometer-thick gold films deposited onto an MPTMS-coated silicon substrate using terahertz time-domain spectroscopy. Following the MPTMS treatment of the substrate, the conductivity of the films was found to increase compared to those deposited onto uncoated substrate for gold films having the thickness less than 11 nm. We observed 5-fold enhancement in the conductivity for a 7 nm-thick gold film. We also demonstrate the fabrication of nanoslot-antenna arrays in 8.2-nm-thick gold films. The nanoslot-antenna with MPTMS coating has resonance at around 0.5 THz with an electric field enhancement of 44, whereas the nanoslot-antenna without MPTMS coating does not show resonant properties. Our results demonstrate that gold films deposited onto MPTMS-coated silicon substrates are promising advanced materials for fabricating ultra-thin terahertz plasmonic devices. ko
dc.language 영어 ko
dc.title Enhanced terahertz conductivity in ultra-thin gold film deposited onto (3-mercaptopropyl) trimethoxysilane (MPTMS)-coated Si substrates ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-85073655979 ko
dc.identifier.wosid 000491226200008 ko
dc.type.rims ART ko
dc.identifier.doi 10.1038/s41598-019-51085-0 ko
dc.identifier.url ko
Appears in Collections:
PHY_Journal Papers

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show simple item record


  • mendeley


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.