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Polarization dependent second harmonic generations of equilateral triangular Au nanorods at localized surface plasmon resonances

机译:局部表面等离振子共振下等边三角形金纳米棒的极化相关二次谐波生成

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The paper presents second harmonic generations (SHG) from Au nanoprisms at localized surface plasmon resonances. The model system was equilateral triangular nanoprisms that were arranged two-dimensionally in trigonal lattices. At lower excitation power regions, the SHG conversion efficiencies were almost independent of the excitation light polarization angles, while the polarization angles of the SHG waves were twice as much as those of the excitation light polarizations. The polarization dependencies were in a good agreement with the demands required from the C_(3V) point symmetry of the systems. On the other hand, the SHG conversion efficiencies were dependent on the excitation light polarization angles at higher excitation power regions. The anisotropy in the nonlmear optical responses was explained from the viewpoint of the polarization-dependent depletions of the surface electrons on the metal surfaces.
机译:本文介绍了在局部表面等离子体激元共振下,金纳米棱镜产生的二次谐波(SHG)。模型系统是等边三角形纳米棱镜,二维排列在三角晶格中。在较低的激发功率区域,SHG转换效率几乎与激发光的偏振角无关,而SHG波的偏振角是激发光偏振角的两倍。极化相关性与系统的C_(3V)点对称性要求完全一致。另一方面,SHG转换效率取决于较高激发功率区域的激发光偏振角。从金属表面上表面电子的极化相关损耗的角度,解释了非薄膜光学响应中的各向异性。

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