期刊
OPTICS LETTERS
卷 39, 期 10, 页码 3066-3069出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.39.003066
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资金
- National Natural Science Foundation of China [61201083, 61275094, U1231201, 613111156, 61171024, 61171026, 60990320, 60990324]
- China Postdoctoral Science Foundation [2012M511171, 2013T60487]
- Special Foundation for Harbin Young Scientists [2012RFLXG030]
- Fundamental Research Funds for the Central Universities
- 111 Project [B13015, 111-2-05]
- National High Tech (863) Projects [2011AA010202, 2012AA030402]
We demonstrate a multiband background-free terahertz (THz) switch in photoactive chiral metamaterial using polarization conversion. Orthogonal arrangement of two asymmetrical split-ring apertures allows a high polarization conversion efficiency and low copolarization transmission. The chiral metamaterial embedded with photoactive silicon promises a dynamic control on cross-polarization transmission and thus enables an efficient background-free THz switch. The on/off state of THz metamaterial switching can be efficiently controlled by an optical pump. The realization of a cross-polarization THz switch provides a new mechanism of mode switching to control THz wave propagation and will be a promising candidate for polarization devices. (C) 2014 Optical Society of America
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