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Second Harmonic Generation Manipulation Enabled by Electromagnetic Coupling in Bianisotropic Metamolecules
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-02-06 , DOI: 10.1002/adom.201701154 Kai Guo 1, 2 , Cheng Qian 2 , Yong Liang Zhang 2 , Kin Hung Fung 2
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-02-06 , DOI: 10.1002/adom.201701154 Kai Guo 1, 2 , Cheng Qian 2 , Yong Liang Zhang 2 , Kin Hung Fung 2
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Bianisotropic metamolecules provide a novel opportunity to realize optical magnetism through localized electromagnetic coupling (EM coupling). Previous investigations of the EM coupling, however, are mostly limited to linear regime. In this work, active manipulation of light in nonlinear regime with EM coupling is theoretically studied. To this end, a bianisotropic metamolecule composed of four uniform gold nanodisks is designed. Simulation results show that a Fano‐like resonance induced by EM coupling is sufficient to control the second harmonic generation (SHG) signal. By rotating polarization angle of optical excitation source, the emitted SHG signal is switched on–off with the EM coupling. Furthermore, modulation of the SHG signal is demonstrated through the EM coupling by tuning the gap size and filling material.
中文翻译：
各向异性的大分子中电磁耦合实现的第二次谐波产生操纵。
各向同性大分子提供了通过局部电磁耦合（EM耦合）实现光磁的新机会。但是，以前对EM耦合的研究大多限于线性范围。在这项工作中，理论上研究了电磁耦合在非线性状态下对光的主动操纵。为此，设计了由四个均匀的金纳米盘组成的各向异性分子。仿真结果表明，由EM耦合引起的类Fano共振足以控制二次谐波（SHG）信号。通过旋转光激励源的偏振角，通过EM耦合可以打开或关闭所发射的SHG信号。此外，通过调整间隙尺寸和填充材料，通过EM耦合演示了SHG信号的调制。
更新日期：2018-02-06
中文翻译：
各向异性的大分子中电磁耦合实现的第二次谐波产生操纵。
各向同性大分子提供了通过局部电磁耦合（EM耦合）实现光磁的新机会。但是，以前对EM耦合的研究大多限于线性范围。在这项工作中，理论上研究了电磁耦合在非线性状态下对光的主动操纵。为此，设计了由四个均匀的金纳米盘组成的各向异性分子。仿真结果表明，由EM耦合引起的类Fano共振足以控制二次谐波（SHG）信号。通过旋转光激励源的偏振角，通过EM耦合可以打开或关闭所发射的SHG信号。此外，通过调整间隙尺寸和填充材料，通过EM耦合演示了SHG信号的调制。
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