期刊
SCIENCE ADVANCES
卷 3, 期 9, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.1701377
关键词
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资金
- Marie-Curie International Incoming Fellowships [626184]
- European Research Council Consolidator Grant (TOPOLOGICAL)
- Institute for Basic Science [IBS-R011-D1]
- Engineering and Physical Sciences Research Council [EP/J018473/1]
- Royal Society
- Wolfson Foundation
- Horizon Action [734578]
- Pioneer Research Center Program [2014M3C1A3052537]
- National Research Foundation of Korea - Korean Government [Ministry of Science, Information and Communication Technology, and Future Planning (MSIP)] [2015001948]
- Center for Advanced Meta-Materials (CAMM) - Korean Government (MSIP) [CAMM-2014M3A6B3063709]
- Leverhulme Trust [RPG-2014-068]
- Engineering and Physical Sciences Research Council [EP/L024926/1] Funding Source: researchfish
- EPSRC [EP/L024926/1] Funding Source: UKRI
Active control of polarization states of electromagnetic waves is highly desirable because of its diverse applications in information processing, telecommunications, and spectroscopy. However, despite the recent advances using artificial materials, most active polarization control schemes require optical stimuli necessitating complex optical setups. We experimentally demonstrate an alternative-direct electrical tuning of the polarization state of terahertz waves. Combining a chiral metamaterial with a gated single-layer sheet of graphene, we show that transmission of a terahertz wave with one circular polarization can be electrically controlled without affecting that of the other circular polarization, leading to large-intensity modulation depths (>99%) with a low gate voltage. This effective control of polarization is made possible by the full accessibility of three coupling regimes, that is, underdamped, critically damped, and overdamped regimes by electrical control of the graphene properties.
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