标题： 超快等离子体晶体偏振转换 显示英文标题

标题： Ultrafast polarization conversion with plasmonic crystals

摘要： 飞秒尺度的偏振态转换在等离子体纳米光栅的光学响应中通过时间分辨偏振测量被实验发现。 同时测量斯托克斯参数随时间的变化，平均时间门为130 fs，揭示了从等离子体晶体反射的单个飞秒脉冲内部偏振态的显著变化。 时间依赖的去偏振现象被实验发现，并在一种解析模型中得到描述，该模型预测使用更窄的时间门可使偏振转换效应增强四倍。 该现象归因于激发了具有高度双折射法诺型光谱轮廓的时间延迟偏振敏感表面等离子体。 显示英文摘要

摘要： Femtosecond-scale polarization state conversion is experimentally found in optical response of a plasmonic nanograting by means of time-resolved polarimetry. Simultaneous measurements of the Stokes parameters as a function of time with an averaging time-gate of 130 fs reveal a remarkable alteration of polarization state inside a single fs-pulse reflected from a plasmonic crystal. Time-dependent depolarization is experimentally found and described within an analytical model which predicts the four-fold enhancement of the polarization conversion effect with the use of the narrower gate. The effect is attributed to excitation of time-delayed polarization-sensitive surface plasmons with a highly birefringent Fano-type spectral profile.