论文标题
等离子体性手性螺旋型III纳米颗粒的第二次谐波光学圆形二分法
Second-harmonic optical circular dichroism of plasmonic chiral helicoid-III nanoparticles
论文作者
论文摘要
等离激元颗粒可以在较低的频谱范围内提供从较低的可见光到近红外的光谐振，但通常利用对称效应来获得特定的光学响应。通过打破某些空间对称性，手性结构出现并为这些等离子共振提供了强大的手性反应。在这里，我们观察到手性Lhand helicoid III纳米颗粒的线性和非线性光学状态的强烈手性反应，并通过不对称因子（所谓的G因子）对其进行量化。我们为两个不同的手流共振计算-0.12和-0.43，并计算出线性光学的G因子，而非线性光学G -FAICTORS则为-1.45和-1.63。结果表明，在非线性状态下，螺旋形III纳米颗粒的手性得到了强烈增强。
While plasmonic particles can provide optical resonances in a wide spectral range from the lower visible up to the near-infrared, often symmetry effects are utilized to obtain particular optical responses. By breaking certain spatial symmetries, chiral structures arise and provide robust chiroptical responses to these plasmonic resonances. Here, we observe strong chiroptical responses in the linear and nonlinear optical regime for chiral L-handed helicoid III nanoparticles and quantify them by means of an asymmetric factor, the so-called g-factor. We calculate the linear-optical g-factors for two distinct chiroptical resonances to -0.12 and -0.43 and the nonlinear optical g-factors to -1.45 and -1.63. The results demonstrate that the chirality of the helicoid-III nanoparticles is strongly enhanced in the nonlinear regime.
