期刊
LIGHT-SCIENCE & APPLICATIONS
卷 4, 期 -, 页码 -出版社
SPRINGERNATURE
DOI: 10.1038/lsa.2015.26
关键词
liquid crystal; porous graphene; terahertz; waveplate
类别
资金
- National Natural Science Foundation of China [61490714, 11304151, 61435008, 61371035, 11227904]
- PhD Programs Foundation of the Ministry of Education of China [20120091120020]
- National Science Fund for Distinguished Young Scholars [61225026]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT13021]
- 973 program [2014CB339800, 2011CBA00200, 2012CB921803]
- Cooperative Innovation Centre of Terahertz Science, University of Electronic Science and Technology (Chengdu, China)
Versatile devices, especially tunable ones, for terahertz imaging, sensing and high-speed communication, are in high demand. Liquid crystal based components are perfect candidates in the optical range; however, they encounter significant challenges in the terahertz band, particularly the lack of highly transparent electrodes and the drawbacks induced by a thick cell. Here, a strategy to overcome all these challenges is proposed: Few-layer porous graphene is employed as an electrode with a transmittance of more than 98%. A subwavelength metal wire grid is utilized as an integrated high-efficiency electrode and polarizer. The homogeneous alignment of a high-birefringence liquid crystal is implemented on both frail electrodes via a non-contact photo-alignment technique. A tunable terahertz waveplate is thus obtained. Its polarization evolution is directly demonstrated. Furthermore, quarter-wave plates that are electrically controllable over the entire testing range are achieved by stacking two cells. The proposed solution may pave a simple and bright road toward the development of various liquid crystal terahertz apparatuses.
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