【摘要】 利用时域有限差分数值模拟方法和耦合模理论分析方法,研究了Kerr型非线性二维光子晶体耦合腔结构中的光学双稳态开关。利用耦合模理论,分析了耦合腔结构的多模特性,以及对应本征态的局域强度分布特性,并讨论了在耦合腔结构中实现多模光学双稳态开关的原理。发现在二维耦合腔结构中,可以实现信号自泵浦和泵浦-信号两种类型的双稳态开关,且后者具有使泵浦和信号在频率和空间相分离的优点。利用非线性时域有限差分数值模拟方法,得到了高斯脉冲激励下的双稳态响应曲线。更多还原

【Abstract】 The optical bistable switching operation in a Kerr type nonlinear 2D photonic crystal coupled cavity(CC) structure is studied using finite-difference time-domain(FDTD) method and coupled mode theory.The multi-mode and localization property of CC structures,and the principles realizing multi-mode optical switching are investigated.It shows that the self-pumping type and pump-probe types bistable switching can both be realized in the same structure,and the latter can separate the pump and signal in frequency and space.The bistable hysteresis loops with Gaussian pulse pumps is obtained by using nonlinear FDTD method.更多还原