Journal
ACS NANO
Volume 15, Issue 8, Pages 13781-13793Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c05421
Keywords
organic-inorganic hybrid perovskites; circularly polarized emission; chiral Fano resonances; symmetry breaking; reciprocity
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Funding
- National Research Foundation (NRF) of Korea [NRF-2019R1A2C1008330]
- UNIST (Ulsan National Institute of Science and Technology) [1.210035.01]
- National Research Foundation of Korea [NRF-2019R1A4A1028121]
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This study demonstrates a significant enhancement of circularly polarized emission at the narrow mode position of chiral Fano resonances.
The design achieved a high DCP at room temperature without direct patterning of the perovskite layer.
Reciprocity calculation revealed that chiral field enhancement enabled emission of opposite helicity to couple into counter-propagating slab modes, resulting in a large DCP.
Organic-inorganic hybrid perovskites hold great potential for various optoelectronic devices with exceptional properties. Although the direct generation of circularly polarized emission from perovskites would enable various compact devices, achieving a large degree of circular polarization (DCP) at room temperature still remains challenging. Herein, we demonstrate that DCP can be strongly enhanced at the narrow mode position of chiral Fano resonances. In our design, a perovskite film is spin-coated on a symmetry-broken structure with a relatively large feature size. A large DCP of more than 0.5 is achieved at room temperature without the direct patterning of the perovskite layer. Reciprocity calculation reveals that chiral field enhancement enables the emission of opposite helicity to couple into counter-propagating slab modes and leads to a large DCP. Our design is very general and scalable. Our work may lead to circularly polarized light sources based on various perovskite materials.
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