Study on plasmonic chiral light-matter interaction and the optical properties of fluorescent microspheres

Nanophotonics research has been progressing in chiral measurements, but improvements are needed in the design of plasmonic nanostructures for enhancing chiral light-matter interactions. Here, linearly polarized light is employed for chiroptical measurements, as evidenced by the fabrication of a 3D Archimedean spiral metasurface and the use of elliptical nanoholes. Structured optical chirality patterns have also shown potential in chiral imaging, separation, and spectroscopy. Moreover, whispering gallery modes (WGM) in self-assembled semiconducting polymer microspheres are a promising avenue for microlaser applications. The impact of conducting substrates with WGM cavities has been explored, and geometry deformation-induced spectral splitting behavior has been demonstrated by using photoswitchable polymers. Additionally, a flexible ionic liquid droplet laser can function stably in the atmosphere and be used for various purposes, including as a humidity sensor. These studies carry important implications for chiral imaging, chiral separation, CD spectroscopy, electroluminescence, and WGM sensors.