Electrically tunable resonant terahertz transmission in subwavelength hole arrays
Zhang Ying (张莹)a b, Liu Ying-Kai (刘应开)a, Han Jia-Guang (韩家广)b
a School of Physics and Electronic Information, Yunnan Normal University, Kunming 650500, China; b Center for Terahertz Wave, Key Laboratory of Opto-electronic Information Technology, Ministry of Education, College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
Abstract An actively enhanced resonant transmission in a plasmonic array of subwavelength holes is demonstrated by use of terahertz time-domain spectroscopy. By connecting this two-dimensional element into an electrical circuit, tunable resonance enhancement is observed in arrays made from good and relatively poor metals. The tunable feature is attributed to the nonlinear electric response of the periodic hole array film, which is confirmed by its voltage-current behavior. This finding could lead to a unique route to active plasmonic devices, such as tunable filters, spatial modulators, and integrated terahertz optoelectronic components.
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