Nonlinear Symmetry Breaking in Symmetric Oligomers
Nonlinear Symmetry Breaking in Symmetric Oligomers
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DOI：
10.1021/acsphotonics.6b00902
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发表时间：
2017-03-01
期刊：
影响因子：
7
通讯作者：
Kivshar, Yuri S.
中科院分区：
文献类型：
--
作者：
Rahmani, Mohsen;Shorokhov, Alexander S.;Kivshar, Yuri S.
报道了对称等离子体低聚物中一种新型的非线性对称性破缺。通过在改变泵浦偏振角的同时监测二次谐波信号的强度，我们观察到非线性对称性破缺是所生成的非线性信号的巨大变化。重要的是，强各向异性非线性响应是由旋转偏振时具有各向同性线性响应的对称结构产生的。我们提供理论分析来描述和表征这种效应。我们的发现开辟了新的途径来揭示和表征纳米级结构和分子的对称性，并远程监测对称纳米结构产生的近场图案的变化。
A novel type of non-linear symmetry breaking in symmetric plasmonic oligomers is reported. By monitoring the strength of the second-harmonic signal while changing the polarization angle of the pump, we observe nonlinear symmetry breaking as a large variation in the generated nonlinear signal. Importantly, the strongly anisotropic nonlinear response is produced by a symmetric structure with isotropic linear response when rotating polarization. We provide theoretical analysis to describe and characterize this effect. Our finding opens new avenues to reveal and characterize the symmetry of nanoscale structures and molecules and also to remotely monitor variations of near field patterns produced by symmetric nanostructures.