Transient optical modulation properties in the terahertz metamaterial of split ring resonators
Zhou Qing-Li(周庆莉), Shi Yu-Lei(施宇蕾)†, Wang Ai-Hua(王爱华), Li Lei(李磊), and Zhang Cun-Lin(张存林)
Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Key Laboratory of Terahertz Optoelectronics of Ministry of Education, Department of Physics, Capital Normal University, Beijing 100048, China
Abstract The ultrafast optical modulation properties of split ring resonators are characterized by utilizing optical pump--terahertz probe spectroscopy. The experimental results show that when the terahertz electric vector is perpendicular to the gap of the split ring resonator, resonant absorption can be quenched significantly under high pump excitation. However, when the terahertz electric vector is parallel to the gap, the resonant absorption is less sensitive to pump excitation due to the structural properties of the metamaterial. Our numerical simulations also demonstrate that the pump pulse significantly influences the split ring resonator current by generating carriers in the substrate.
Fund: Project supported by the National Basic Research Program of China (Grant No. 2007CB310408), the National Natural Science Foundation of China (Grant Nos. 10804077, 10904098 and 11011120242), the Beijing Municipal Commission of Education, China (Grant No. KM200910028006), the Foundation for Key Program of Ministry of Education, China (Grant No. 210002), the Beijing Nova Program, and the Funding Project for Academic Human Resources Development in Institutions of Higher Learning Under the Jurisdiction of Beijing Municipality, China.
Cite this article:
Zhou Qing-Li(周庆莉), Shi Yu-Lei(施宇蕾), Wang Ai-Hua(王爱华), Li Lei(李磊), and Zhang Cun-Lin(张存林) Transient optical modulation properties in the terahertz metamaterial of split ring resonators 2012 Chin. Phys. B 21 058701
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