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Optical limiting by nonlinear tuning of resonance in metamaterial absorbers

机译:通过超材料吸收器共振的非线性调谐进行光学限制

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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:超材料共振吸收器(MRA)具有强烈的局部场增强作用,可用于引发大的非线性响应。由于金和ZnS的Kerr非线性,由由ZnS薄膜与下层金层隔开的金圆盘组成的MRA对1064 nm处8 ps脉冲的反射率显示出光学限制。测量了由于位于ZnS层中的大电场而产生的来自多光子吸收的荧光,它是有效的。与裸露的ZnS薄膜相比,该层的chi((3))增强了3个数量级。自洽非线性电磁仿真证实非线性吸收是由共振强度增加引起的。 (C)2016美国眼镜学会

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