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Optical limiting by nonlinear tuning of resonance in metamaterial absorbers

机译:超石料吸收器中共振非线性调谐的光学限制

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Metamaterial resonant absorbers (MRA) have intense local field enhancements that can be used to elicit large nonlinear responses. An MRA, composed of gold disks separated by a ZnS thin film from an underlying gold layer, shows optical limiting for the reflectivity of 8 ps pulses at 1064 nm due to the Kerr nonlinearity of gold and ZnS. Fluorescence from multiphoton absorption due to large fields localized in the ZnS layer is measured, and the effective. chi((3)) of the layer is enhanced by 3 orders of magnitude compared to bare ZnS thin films. Self-consistent nonlinear electromagnetic simulations confirm that the nonlinear absorption is caused by a shift of the resonance with increasing intensity. (C) 2016 Optical Society of America
机译:超材料谐振吸收剂(MRA)具有激烈的局部场增强功能,可用于引出大型非线性反应。 由由ZnS薄膜从下面的金层分开的金盘组成的MRA,显示出由于金和ZnS的克尔非线性而在1064nm处的8 ps脉冲的反射率的光学限制。 测量由于ZnS层内部化的大场的多光子吸收的荧光,并且有效。 与裸ZNS薄膜相比,该层的Chi((3))通过3个级增强。 自我一致的非线性电磁模拟确认非线性吸收是由谐振的偏移引起的,随着强度的增加而引起。 (c)2016年光学学会

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