Dynamic control of the terahertz rainbow trapping effect based on a silicon-filled graded grating

• Published in: 中国物理B：英文版 no. 1; pp. 421 - 425
• Main Author: 王书林 丁岚 徐文
• Format: Journal Article
• Language: English
• Published: 2017
• ISSN: 1674-1056; 2058-3834

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.