Ren Ming-Liang, Li Zhi-Yuan
Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190, China.
Opt Express. 2009 Aug 17;17(17):14502-10. doi: 10.1364/oe.17.014502.
We theoretically investigate second harmonic generation (SHG) in one-dimensional multilayer nonlinear photonic crystal (NPC) structures with distributed Bragg reflector (DBR) as mirrors. The NPC structures have periodic modulation on both the linear and second-order susceptibility. Three major physical mechanisms, quasi-phase matching (QPM) effect, slow light effect at photonic band gap edges, and cavity effect induced by DBR mirrors can be harnessed to enhance SHG. Selection of appropriate structural parameters can facilitate coexistence of these mechanisms to act collectively and constructively to create very high SHG conversion efficiency with an enhancement by up to seven orders of magnitude compared with the ordinary NPC where only QPM works.
我们从理论上研究了以分布式布拉格反射器（DBR）作为反射镜的一维多层非线性光子晶体（NPC）结构中的二次谐波产生（SHG）。该NPC结构在线性和二阶极化率上都具有周期性调制。可以利用三种主要物理机制，即准相位匹配（QPM）效应、光子带隙边缘的慢光效应以及DBR反射镜引起的腔效应来增强SHG。选择合适的结构参数可以促进这些机制共同存在并协同建设性地发挥作用，从而产生非常高的SHG转换效率，与仅QPM起作用的普通NPC相比，增强幅度高达七个数量级。
