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研究填充非线性材料的金属介质金属(MIM)平面波导中的四波混频(FWM)效应,针对该类基于表面等离子体(SP)局域增强和双折射特性的微纳器件,具体分析了不同偏振态抽运光输入所对应的FWM过程。在厚度为250nm的波导中,当入射抽运偏振态相同时FWM效应最强,FWM效率达到-33dB;在入射抽运偏振态正交时FWM效应最弱,没有闲频波产生。在厚度为50nm的波导中由于SP TE模式截止,仅在入射抽运偏振态均为TM时FWM效率达到-30dB,其他偏振态下没有闲频波产生。利用上述特性可以制作基于FWM的微纳全光逻辑器件。
The effects of four-wave mixing (FWM) in metal-based metal (MIM) plane waveguides filled with nonlinear materials are studied. For the micro-nano devices based on surface plasmon (SP) local enhancement and birefringence, Different polarization state of the pump light input corresponds to the FWM process. In waveguide with thickness of 250nm, the FWM effect is the strongest when the incident pumped polarization state is the same, and the FWM efficiency reaches -33dB. The FWM effect is the weakest in the orthogonal polarization state of incident pump and there is no idler wave. Due to the cut-off of the SP TE mode in a waveguide with a thickness of 50 nm, the FWM efficiency reaches -30 dB only when the incident pump polarization state is TM, and no idler wave is generated in other polarization states. Using these features can be produced based on FWM micro-nano all-optical logic devices.