Journal
ACS PHOTONICS
Volume 5, Issue 4, Pages 1486-1492Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.7b01511
Keywords
chirality; optical activity; nanomaterial; plasmonics; polarimetry; scanning near-field microscope
Categories
Funding
- Japan Society for the Promotion of Science (JSPS) [JP16H06505, JP22225002, JP15H02161, JP15K13683, JP17H07330, JP15J01261]
- JSPS Core-to-Core Program (A. Advanced Research Networks) [JP16H06505, JP22225002, JP15H02161, JP15K13683, JP17H07330, JP15J01261]
- Photon Frontier Network Program of the Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan
- IMS
- SOKENDAI
- Grants-in-Aid for Scientific Research [16H06503, 16H06505, 16K21732, 17H07330, 15H02161, 17H03014] Funding Source: KAKEN
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Chiral systems (consisting of materials and incident radiation) respond differently to left- and right-handed circularly polarized light macroscopically. As a consequence, only chiral materials show intrinsic macroscopic optical activity, and only chiral systems generate circularly polarized light from linearly polarized incident light. In the nanoscopic regime, in contrast to this general rule for macroscopic cases, it is theoretically expected that achiral (nonchiral) systems can locally generate circularly polarized fields. Here, we report experimental evidence for that situation in achiral systems consisting of gold nanostructures and linearly polarized incident light. The local circularly polarized fields were visualized by near-field polarimetry imaging, and the spatial features of the observed circularly polarized fields were qualitatively reproduced by a simple dipole model. The present results may provide a novel technique to produce controllable circularly polarized optical fields in nanospaces.
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