Chiral Light Emission from a Sphere Revealed by Nanoscale Relative-Phase Mapping,ACS Nano

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Chiral Light Emission from a Sphere Revealed by Nanoscale Relative-Phase Mapping
ACS Nano ( IF 15.8 ) Pub Date : 2020-08-26 , DOI: 10.1021/acsnano.0c05624
Taeko Matsukata _{1,

2} , F Javier García de Abajo _{3,

4} , Takumi Sannomiya _{1,

5}

Affiliation

Circularly polarized light (CPL) is currently receiving much attention as a key ingredient for next-generation information technologies, such as quantum communication and encryption. CPL photon generation used in those applications is commonly realized by coupling achiral optical quantum emitters to chiral nanoantennas. Here, we explore a different strategy consisting in exciting a nanosphere—the ultimate symmetric structure—to produce CPL emission along an arbitrary direction. Specifically, we demonstrate chiral emission from a silicon nanosphere induced by an electron beam based on two different strategies: either shifting the relative phase of degenerate orthogonal dipole modes or interfering electric and magnetic modes. We prove these concepts both theoretically and experimentally by visualizing the phase and polarization using a fully polarimetric four-dimensional cathodoluminescence method. Besides their fundamental interest, our results support the use of free-electron-induced light emission from spherically symmetric systems as a versatile platform for the generation of chiral light with on-demand control over the phase and degree of polarization.

中文翻译：

纳米级相对相位映射揭示的球体手性光发射

圆偏振光 (CPL) 作为下一代信息技术（如量子通信和加密）的关键成分，目前正受到广泛关注。在这些应用中使用的 CPL 光子生成通常是通过将非手性光量子发射器耦合到手性纳米天线来实现的。在这里，我们探索了一种不同的策略，包括激发纳米球——最终的对称结构——以沿任意方向产生 CPL 发射。具体来说，我们展示了基于两种不同策略的电子束诱导的硅纳米球的手性发射：移动简并正交偶极子模式的相对相位或干扰电和磁模式。我们通过使用全偏振四维阴极发光方法可视化相位和偏振，在理论上和实验上证明了这些概念。除了他们的基本兴趣之外，我们的结果还支持使用来自球对称系统的自由电子诱导光发射作为生成手征光的通用平台，并按需控制相位和偏振度。

更新日期：2020-08-26

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