Spin-resolved near-field scanning optical microscopy for mapping of the spin angular momentum distribution of focused beams

被引：17

作者：

Yin, Xiaojin ^{[1
,2
]}

Shi, Peng ^{[1
,2
]}

Du, Luping ^{[1
]}

Yuan, Xiaocong ^{[1
,2
]}

机构：

[1] Shenzhen Univ, Inst Microscale Optoelect, Nanophoton Res Ctr, Shenzhen 518060, Peoples R China

[2] Shenzhen Univ, Coll Phys & Optoelect Engn, Shenzhen 518060, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2020年 / 116卷 / 24期

基金：

中国国家自然科学基金;

关键词：

LIGHT; NANOPARTICLE;

D O I：

10.1063/5.0004750

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We proposed and built a near-field scanning optical microscope (NSOM) to enable the characterization of the spin angular momentum (SAM) distribution of electromagnetic fields with nanoscale resolution. The NSOM probe was composed of a circular nanohole formed in a thick gold film that was deposited on a tapered cone fiber. The near-field signal, when coupled through the nanohole to the fiber, was split and analyzed using a combination of a quarter-wave plate and a polarizer to extract the two circular polarization components of the signal. This allowed us to characterize the out-of-plane SAM component, which was determined using the relationship S-z proportional to I-RCP - I-LCP. Using the developed system, we mapped the SAM distributions of a variety of tightly focused cylindrical vector vortex beams and thus validated the system's effectiveness. The proposed spin-resolved NSOM could be a valuable tool for studies of both near-field spin optics and topological photonics.

引用

页数：4

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