期刊
OPTICS LETTERS
卷 41, 期 19, 页码 4562-4565出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.41.004562
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资金
- National Basic Research Program of China [2014CB339800]
- National Natural Science Foundation of China (NSFC) [61307125, 61138001, 61427814, 61422509, 61420106006, 61328503, 61205098]
- Major National Development Project of Scientific Instruments and Equipment [2011YQ150021]
- U.S. National Science Foundation (NSF) [ECCS-1232081]
- Program for Changjiang Scholars and Innovative Research Team in University, PCSIRT [IRT13033]
- Guangxi Key Laboratory of Automatic Detecting Technology and Instruments [YQ14207]
- Los Alamos National Laboratory (LANL)
- U.S. Department of Energy (DOE) [DE-AC52-06NA25396]
Recently reported active metamaterial analogues of electromagnetically induced transparency (EIT) are promising in developing novel optical components, such as active slow light devices. However, most of the previous works have focused on manipulating the EIT resonance strength at a fixed characteristic frequency and, therefore, realized onto-off switching responses. To further extend the functionalities of the EIT effect, here we present a frequency tunable EIT analogue in the terahertz regime by integrating photoactive silicon into the metamaterial unit cell. A tuning range from 0.82 to 0.74 THz for the EIT resonance frequency is experimentally observed by optical pump-terahertz probe measurements, allowing a frequency tunable group delay of the terahertz pulses. This straightforward approach delivers frequency agility of the EIT resonance and may enable novel ultrafast tunable devices for integrated plasmonic circuits. (C) 2016 Optical Society of America
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