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DC Field | Value | Language |
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dc.citation.number | 16 | - |
dc.citation.startPage | 2100462 | - |
dc.citation.title | ADVANCED OPTICAL MATERIALS | - |
dc.citation.volume | 9 | - |
dc.contributor.author | Choi, Geunchang | - |
dc.contributor.author | Chau, Tuan Khanh | - |
dc.contributor.author | Hong, Sung Ju | - |
dc.contributor.author | Kim, Dasom | - |
dc.contributor.author | Kim, Sung Hyuk | - |
dc.contributor.author | Kim, Dai-Sik | - |
dc.contributor.author | Suh, Dongseok | - |
dc.contributor.author | Bahk, Young-Mi | - |
dc.contributor.author | Jeong, Mun Seok | - |
dc.date.accessioned | 2023-12-21T15:37:33Z | - |
dc.date.available | 2023-12-21T15:37:33Z | - |
dc.date.created | 2021-06-08 | - |
dc.date.issued | 2021-08 | - |
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. | - |
dc.identifier.bibliographicCitation | ADVANCED OPTICAL MATERIALS, v.9, no.16, pp.2100462 | - |
dc.identifier.doi | 10.1002/adom.202100462 | - |
dc.identifier.issn | 2195-1071 | - |
dc.identifier.scopusid | 2-s2.0-85106277365 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/53211 | - |
dc.identifier.url | https://onlinelibrary.wiley.com/doi/10.1002/adom.202100462 | - |
dc.identifier.wosid | 000653105100001 | - |
dc.language | 영어 | - |
dc.publisher | WILEY-V C H VERLAG GMBH | - |
dc.title | Augmented All-Optical Active Terahertz Device Using Graphene-Based Metasurface | - |
dc.type | Article | - |
dc.description.isOpenAccess | FALSE | - |
dc.relation.journalWebOfScienceCategory | Materials Science, Multidisciplinary; Optics | - |
dc.relation.journalResearchArea | Materials Science; Optics | - |
dc.type.docType | Article; Early Access | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.subject.keywordAuthor | graphene | - |
dc.subject.keywordAuthor | metasurfaces | - |
dc.subject.keywordAuthor | optical pump terahertz probe spectroscopy | - |
dc.subject.keywordAuthor | terahertz modulation | - |
dc.subject.keywordAuthor | ultrafast dynamics | - |
dc.subject.keywordPlus | CARRIER RELAXATION | - |
dc.subject.keywordPlus | DYNAMICS | - |
dc.subject.keywordPlus | MODULATION | - |
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