We theoretically propose a broadband optical isolator based on second-harmonic generation in a one-dimensional quadratic nonlinear photonic crystal (NPC) with an embedded defect. An external electric field along the z axis is applied to modulate the NPC refractive index periodically. Complete optical isolation always could be reached with the help of an external field. Influences of the defect position and thickness are discussed. The spectral and power tolerances of the isolator also have been investigated and show high contrast within a wide wavelength range at different power levels.
© 2010 Optical Society of America
Original Manuscript: July 12, 2010
Manuscript Accepted: August 28, 2010
Published: October 7, 2010
Zi-yan Yu, Fei Xu, Xiao-wen Lin, Xiao-shi Song, Xiao-shi Qian, Qin Wang, and Yan-qing Lu, "Tunable broadband isolator based on electro-optically induced linear gratings in a nonlinear photonic crystal," Opt. Lett. 35, 3327-3329 (2010)