期刊
ADVANCED OPTICAL MATERIALS
卷 3, 期 12, 页码 1744-1749出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201500285
关键词
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资金
- National Basic Research Program (973 Program) of China [2012CB921900]
- Chinese National Key Basic Research Special Fund [2011CB922003]
- Natural Science Foundation of China [61378006, 11304163]
- Program for New Century Excellent Talents in University [NCET-13-0294]
- Natural Science Foundation of Tianjin [13JCQNJC01900]
- Specialized Research Fund for the Doctoral Program of Higher Education [20120031120032]
- 111 project [B07013]
Metasurfaces, which are capable of generating structure and wavelength dependent phase shift, have emerged as promising means for controlling the wavefront of electromagnetic waves. Finding new ways to realize broadband frequency response as well as maintaining high conversion efficiency still requires research efforts. For the design of plasmonic metasurfaces, graphene represents an attractive alternative to metals due to its strong field confinement and versatile tunability. Here, a novel metasurface based on graphene is proposed to control the wavefront of light. Dynamically tunable anomalous refraction composed of periodically patterned graphene nanocrosses for circularly polarized waves is achieved in the infrared regime. Broadband properties of anomalous refraction are demonstrated by investigating different frequencies and incident angles. Moreover, the anomalous conversion efficiency can be dynamically tuned and remain as high in a broadband frequency range by varying the Fermi energy without reoptimizing the nanostructures. This work may offer a further step in the development of a tunable wavefront controlling device.
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