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Opt Lett. 2010 Oct 15;35(20):3327-9. doi: 10.1364/OL.35.003327.

Tunable broadband isolator based on electro-optically induced linear gratings in a nonlinear photonic crystal.

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  • 1College of Engineering and Applied Sciences and National Laboratory of Solid State Microstructures,Nanjing University, Nanjing 210093, China.


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.

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