1. Dynamic control of luminescence chirality through achiral metasurfaces
- Author
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Wu, Yawei, Wang, Zhenyu, Xu, Jiahui, He, Chenlu, He, Shuqing, Wang, Ruize, Wang, Chaowei, Wu, Dong, Chu, Jiaru, Wu, Yiming, Liu, Xiaogang, and Chen, Yang
- Subjects
Physics - Optics - Abstract
Circularly polarized light (CPL) sources are essential for chiroptics, spintronics, quantum optics, and asymmetric photochemistry. However, conventional approaches fail to simultaneously realize a large luminescence dissymmetry factor (glum) and wide-range tuning of glum in a compact device. Chiral luminophores usually suffer from low glum due to their small molecular sizes. Although chiral metasurfaces can enable a large glum, they lack post-fabrication tunability. Here, we demonstrate that it is possible to achieve high-purity circularly polarized luminescence using achiral metasurfaces. These metasurfaces enable optical tuning and even reversal of luminescence chirality by uncovering and utilizing giant near-field chirality. We validate our concept with upconversion nanoparticles and downshifting dye molecules, experimentally achieving a large glum of up to 1.65, which can be actively and continuously tuned between 1.65 and -1.58. Our approach promises important applications in next-generation CPL sources and detectors, and tunable quantum devices.
- Published
- 2024