Abstract-Metamaterial terahertz switch based on split-ring resonator embedded with photoconductive silicon

Metamaterial terahertz switch based on split-ring resonator embedded with photoconductive silicon Xinwang Liu, Hongjun Liu, Qibing Sun, and Nan Huang  »View Author Affiliations

Applied Optics, Vol. 54, Issue 11, pp. 3478-3483 (2015)
http://dx.doi.org/10.1364/AO.54.003478

http://www.opticsinfobase.org/ao/abstract.cfm?uri=ao-54-11-3478

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In this paper, a metamaterial terahertz (THz) switch based on a split-ring resonator embedded with photoconductive silicon is presented and numerically investigated. Simulation results show that the switch works at two different resonant modes with different pump light powers and that the response time of the switch is less than 1 ps. By defining the switching window as the frequency range where the transmission magnitude of the ON state is one order of magnitude higher than the OFF state, a switching window ranging from 1.26 to 1.49 THz is obtained. The large modulation depth of the switch is due to the large separations of the maximum and minimum transmissions, which are 0.89 and 0.01, respectively. Particularly, the switch is frequency tunable by changing the thickness and permittivity of the dielectric layer.

© 2015 Optical Society of America

Abstract-Tunable terahertz Kerr switching based on nonlinear polarization rotation in silicon waveguide

Miaoli Mou, Hongjun Liu, Nan Huang, Qibing Sun, and Zhaolu Wang  »View Author Affiliations

Applied Optics, Vol. 53, Issue 12, pp. 2741-2747 (2014)
http://dx.doi.org/10.1364/AO.53.002741

A compact and widely tunable terahertz (THz) all-optical Kerr switching using nonlinear polarization rotation generated by cross-phase modulation in a silicon waveguide is theoretically proposed. A switching efficiency of 83% is obtained when a π-phase shift difference between the TE and TM polarization components of the continuous-wave THz signal is achieved. Moreover, the tuning range of the THz switching is from 7.69 to 10 THz through changing the pump power. This THz all-optical switching has potential applications in THz communications and other THz switchable devices.

© 2014 Optical Society of America