Dynamic control of the terahertz rainbow trapping effect based on a silicon-filled graded grating |
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Institution: | 1. School of Physics and Astronomy, Yunnan University, Kunming 650091, China;2. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China |
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Abstract: | We theoretically propose a scheme to realize the dynamic control of the properties of the terahertz(THz) rainbow trapping effect(RTE) based on a silicon-filled graded grating(SFGG) in a relatively broad band via optical pumping.Through the theoretical analysis and finite-element method simulations, it is conceptually demonstrated that the band of the RTE can be dynamically tuned in a range of ~0.06 THz. Furthermore, the SFGG can also be optically switched between a device for the RTE and a waveguide for releasing the trapped waves. The results obtained here may imply applications for the tunable THz plasmonic devices, such as on-chip optical buffers, broad band slow-light systems, and integrated optical filters. |
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Keywords: | metamaterials subwavelength structures slow light terahertz |
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