Khurgin Jacob B, Sun Greg
Department of Electrical & Computer Engineering, Johns Hopkins University, Baltimore, MD 21218, USA.
Opt Express. 2012 Dec 17;20(27):28717-23. doi: 10.1364/OE.20.028717.
We show that using metal-insulator-metal (MIM) waveguides to carry out various second-order nonlinear optical processes not only provides highly desired tight optical confinement but also facilitates the phase-matching due to their inherently large anisotropy. This fact allows one to take advantage of otherwise inaccessible large nonlinear susceptibilities of the cubic zinc blende semiconductors. Our efficiency estimates show that since only the longer wavelength infra-red radiation propagates in the surface-plasmon-polariton (SPP) mode, the losses in the metal, while significant, do not preclude development of highly compact nonlinear optical devices on this integration-friendly semiconductor platform.
我们表明，使用金属-绝缘体-金属（MIM）波导来实现各种二阶非线性光学过程，不仅能提供极为理想的紧密光学限制，还因其固有的大各向异性而便于相位匹配。这一事实使得人们能够利用立方闪锌矿半导体原本难以获取的大非线性极化率。我们的效率估算表明，由于只有较长波长的红外辐射以表面等离激元极化激元（SPP）模式传播，金属中的损耗虽显著，但并不妨碍在这个便于集成的半导体平台上开发高度紧凑的非线性光学器件。
