Toward Chiral Sensing and Spectroscopy Enabled by All‐Dielectric Integrated Photonic Waveguides,Laser & Photonics Reviews

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Toward Chiral Sensing and Spectroscopy Enabled by All‐Dielectric Integrated Photonic Waveguides
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2020-07-26 , DOI: 10.1002/lpor.201900422
J. Enrique Vázquez‐Lozano ₁ , Alejandro Martínez ₁

Affiliation

Chiral spectroscopy is a powerful technique enabling to identify optically the chirality of matter. So far, most experiments to check the chirality of matter or nanostructures have been performed through arrangements wherein both the optical excitation and detection are realized via circularly polarized light propagating in free space. However, for the sake of miniaturization, it would be desirable to perform chiral spectroscopy in photonic integrated platforms, with the additional benefit of massive parallel detection, low‐cost production, repeatability, and portability. Here it is shown that all‐dielectric photonic waveguides can support chiral modes under proper combination of fundamental eigenmodes. Two mainstream configurations are investigated: a dielectric wire with square cross section and a slotted waveguide. Three different scenarios in which such waveguides could be used for chiral detection are numerically analyzed: waveguides as near‐field probes, evanescent‐induced chiral fields, and chiroptical interaction in void slots. In all the cases, a metallic nanohelix is considered as a chiral probe, though all the approaches can be extended to other kinds of chiral nanostructures as well as matter. These results establish that chiral applications such as sensing and spectroscopy could be realized in standard integrated optics, in particular, with silicon‐based technology.

中文翻译：

全介电集成光子波导实现的手性传感和光谱学研究

手性光谱学是一种强大的技术，能够从光学上识别物质的手性。迄今为止，大多数检查物质或纳米结构的手性的实验都是通过安排进行的，其中光激发和检测都是通过在自由空间中传播的圆偏振光实现的。但是，出于小型化的考虑，希望在光子集成平台中执行手性光谱分析，并具有大规模并行检测，低成本生产，可重复性和可移植性的额外优势。此处表明，在基本本征模的适当组合下，全介电光子波导可以支持手征模。研究了两种主流配置：具有方形横截面的电介质线和开槽波导。数值分析了可将这种波导用于手性检测的三种不同情况：作为近场探针的波导，e逝诱导的手性场以及空隙中的手性相互作用。在所有情况下，都可以将金属纳米螺旋视为手性探针，尽管所有方法都可以扩展到其他种类的手性纳米结构以及物质上。这些结果表明，手感应用（例如传感和光谱学）可以在标准集成光学器件中实现，尤其是基于硅的技术。尽管所有方法都可以扩展到其他种类的手性纳米结构以及物质。这些结果表明，手感应用（例如传感和光谱学）可以在标准集成光学器件中实现，尤其是基于硅的技术。尽管所有方法都可以扩展到其他种类的手性纳米结构以及物质。这些结果表明，手感应用（例如传感和光谱学）可以在标准集成光学器件中实现，尤其是基于硅的技术。

更新日期：2020-09-10

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