BROWSE

Related Researcher

Author's Photo

Kim, Dai-Sik
Research Interests

ITEM VIEW & DOWNLOAD

Augmented All-Optical Active Terahertz Device Using Graphene-Based Metasurface

DC Field Value Language
dc.contributor.author Choi, Geunchang ko
dc.contributor.author Chau, Tuan Khanh ko
dc.contributor.author Hong, Sung Ju ko
dc.contributor.author Kim, Dasom ko
dc.contributor.author Kim, Sung Hyuk ko
dc.contributor.author Kim, Dai-Sik ko
dc.contributor.author Suh, Dongseok ko
dc.contributor.author Bahk, Young-Mi ko
dc.contributor.author Jeong, Mun Seok ko
dc.date.available 2021-07-15T07:40:19Z -
dc.date.created 2021-06-08 ko
dc.date.issued 2021-08 ko
dc.identifier.citation ADVANCED OPTICAL MATERIALS, v.9, no.16, pp.2100462 ko
dc.identifier.issn 2195-1071 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/53211 -
dc.description.abstract Photo-excited graphene has a positive (semiconductor-like) or negative (metal-like) response depending on the Fermi level, which is tuned by gate control, doping, and growth. Both negative and positive photoconductive responses have a potential application as an ultrafast optical modulator in the control of light transmission. However, it is challenging to achieve a high on/off ratio in the photo-excited graphene because of a small absorption of electromagnetic waves and a limitation of photo-induced conductivity change. Here, the negative-type high on/off ratio and ultrafast terahertz modulation are experimentally demonstrated using graphene/metal nanoslot antennas. When the graphene covers the nanoslot antennas, the terahertz waves are completely blocked (off-state). This perfect extinction results from the enhanced intraband absorption in graphene by strong localized fields near the nanogap. However, once the optical pump is applied to the graphene/nanoslot antennas, terahertz transmission becomes recovered resonantly (on-state) due to the photo-induced transparency of graphene that leads to a distinctive modulation from off- to on-resonance. Furthermore, the fast carrier relaxation induced by strong terahertz field-driven carrier redistribution is responsible for the faster modulation of transient terahertz transmission. The results will open up pathways toward negative-response terahertz modulation applications with high on/off ratio and ultrafast time scale. ko
dc.language 영어 ko
dc.publisher WILEY-V C H VERLAG GMBH ko
dc.title Augmented All-Optical Active Terahertz Device Using Graphene-Based Metasurface ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-85106277365 ko
dc.identifier.wosid 000653105100001 ko
dc.type.rims ART ko
dc.identifier.doi 10.1002/adom.202100462 ko
dc.identifier.url https://onlinelibrary.wiley.com/doi/10.1002/adom.202100462 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

qrcode

  • mendeley

    citeulike

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

MENU