基于非线性光子晶体设计全光二极管

Design of Optical Diodes Based on Nonlinear Photonic Crystal

针对光子晶体全光二极管在引入Kerr非线性情况下的非对称透射行为进行了研究,目的是实现高透射率以及最大对比度的全光二极管。采用有限时域差分技术的数值模拟方法结合理论分析方法对光子晶体全光二极管的各种性能参数展开研究。在研究中发现可以由两个尺寸不同但具有相同共振频率的缺陷对构建光二极管,在非线性情况下它的透射率和对比度都能获得较大的提高,即选择适当的入射光功率以及合适的缺陷尺寸我们能得到最佳优化的光二极管。

The unidirectional transmission behaviors of photonic crystal （PC） molecules consisting of defect pairs with Kerr nonlinearity are investigated with the focus on how to enhance the transmission contrast and maximum transmission of the resulting optical diodes. Theoretical analyses in combination with the numerical simulations based on the finite-difference time-domain （FDTD） technique are employed to evaluate the designed optical diodes. It is found that when the constitutional defects possess different radius but similar resonant, the transmission contrast as well as the maximum transmission of the nonlinear PC molecules can be significantly improved. In addition, the optimum performance of the optical diodes can be achieved only when the operating frequency is properly chosen.