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arXiv 2201.06975physics.optics
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一般电磁散射理论中螺旋度与光损耗的相关性

Correlations between helicity and optical losses within general electromagnetic scattering theory

Jon Lasa-Alonso, Jorge Olmos-Trigo, Aitzol García-Etxarri, Gabriel Molina-Terriza

摘要:

近年来,保螺旋纳米结构和超颖表面被认为是增强手性物质光谱特性的合适候选材料。考虑到这一点,我们强调,损失的构成材料的螺旋性显着影响的可能性,建设结构,保存螺旋。首先,我们提出了一个通用的程序,允许评估的归一化螺旋度期望值,$\langle\hatΛ\rangle$,即可观察到的,允许识别的螺旋度保持散射体。然后,我们将此程序的情况下,手性球,在一个方向平均的图片可以捕获的手性无机纳米结构的光学响应,获得广泛适用的分析表达式$\langle\hatΛ\rangle$为这种类型的对象。最后,我们数值计算表明,光学损耗施加上界的螺旋度期望值的螺旋核壳和手征球。

英文摘要:

Helicity preserving nanostructures and metasurfaces have been recently proposed as suitable candidates to enhance spectroscopic features of chiral matter. With this in mind, we highlight that losses in the constituent nonmagnetic materials dramatically affect the possibility of constructing structures which conserve helicity. We first present a general procedure that permits the evaluation of the normalized helicity expectation value, $\langle\hatΛ\rangle$, i.e. the observable that permits the identification of helicity preserving scatterers. We then apply this procedure to the case of a chiral sphere, which in an orientation averaged picture can capture the optical response of chiral inorganic nanostructures, obtaining a widely applicable analytical expression of $\langle\hatΛ\rangle$ for this type of objects. Finally, we numerically show that optical losses impose an upper bound to the helicity expectation value on nonmagnetic core-shells and chiral spheres.

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