Zhong Zhi-Jian, Xu Yi, Lan Sheng, Dai Qiao-Feng, Wu Li-Jun
Laboratory of Photonic Information Technology, School for Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, P.R. China.
Opt Express. 2010 Jan 4;18(1):79-86. doi: 10.1364/OE.18.000079.
Based on the excitation of surface plasmon polaritons (SPPs), we analytically and numerically investigate the transmission response in metal-dielectric-metal (MDM) plasmonic waveguides with a side coupled nanocavity (SCNC). By filling the nanocavity with a Kerr nonlinear medium, the position of the resonant dip in the transmission spectrum can be tuned by the incident light intensity. The oscillation of a Fabry-Perot nanocavity formed by incorporating a finite length of the same Kerr nonlinear media into the MDM waveguide acts as a background for the transmission response of the system and induces a sharp and asymmetric response line shape. As a result, the wavelength shift required for the plasmonic device to be switched from the maximum to the minimum transmission can be reduced by half in a structure less than 400 nm long. Such an effect may be potentially applied to constructing SPP-based all-optical switching with low power threshold at nanoscale.
基于表面等离激元极化激元（SPP）的激发，我们通过解析和数值方法研究了带有侧向耦合纳米腔（SCNC）的金属 - 介质 - 金属（MDM）等离子体波导中的传输响应。通过在纳米腔中填充克尔非线性介质，传输光谱中共振凹陷的位置可以通过入射光强度进行调谐。通过在MDM波导中纳入有限长度的相同克尔非线性介质形成的法布里 - 珀罗纳米腔的振荡，作为系统传输响应的背景，并诱导出尖锐且不对称的响应线形。结果，在长度小于400 nm的结构中，等离子体器件从最大传输切换到最小传输所需的波长偏移可以减少一半。这种效应可能潜在地应用于构建纳米尺度下具有低功率阈值的基于SPP的全光开关。
