期刊
NATURE COMMUNICATIONS
卷 6, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms9814
关键词
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资金
- Samsung Research Funding Center of Samsung Electronics [SRFC-MA1402-02]
- National Research Foundation of Korea (NRF) through the government of Korea (MSIP) [NRF-2011-0013255, NRF-2009-0083512, WCI 2011-001]
- Global Frontier Program [2014M3A6B3063709]
- Yonsei University Yonsei-SNU Collaborative Research Fund
- Yonsei University Future-leading Research Initiative
- NRF of Korea through the government of Korea (MSIP) [NRF-2009-0083540]
- ONR [N000141210456]
- NSF [DMR-1308142]
- Gordon and Betty Moore Foundation's EPiQS Initiative [GBMF4418]
- Institute for Basic Science, Korea [IBS-R014-G1]
- Ministry of Science, ICT & Future Planning, Republic of Korea [IBS-R014-D1-2015-A00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2009-0083512, 2014M3A6B3063709, 76942-15-A, 2011-0013255] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1308142] Funding Source: National Science Foundation
Modulating light via coherent charge oscillations in solids is the subject of intense research topics in opto-plasmonics. Although a variety of methods are proposed to increase such modulation efficiency, one central challenge is to achieve a high modulation depth ( defined by a ratio of extinction with/without light) under small photon-flux injection, which becomes a fundamental trade-off issue both in metals and semiconductors. Here, by fabricating simple micro-ribbon arrays of topological insulator Bi2Se3, we report an unprecedentedly large modulation depth of 2,400% at 1.5 THz with very low optical fluence of 45 mu J cm(-2). This was possible, first because the extinction spectrum is nearly zero due to the Fano-like plasmon-phonon-destructive interference, thereby contributing an extremely small denominator to the extinction ratio. Second, the numerator of the extinction ratio is markedly increased due to the photoinduced formation of massive two-dimensional electron gas below the topological surface states, which is another contributor to the ultra-high modulation depth.
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