Journal
NATURE COMMUNICATIONS
Volume 13, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41467-022-29253-0
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Funding
- Singapore National Research Foundation [NRF-CRP14-2014-03]
- A*STAR-AME programmatic fund on Nanoantenna Spatial Light Modulators for Next-Gen Display Technologies [A18A7b0058]
- Singapore Ministry of Education [MOE2016-T3-1-006]
- Fundamental Research Funds for Central Universities, Nankai University [023-63213067]
- NSFC of China [52103218]
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This study presents the realization of all-dielectric perovskite metasurfaces with giant superstructural chirality through planar nanostructuring. The electric and magnetic multipole moments of the resonant chiral metamolecules are tuned to achieve high anisotropy factor and circular dichroism. The results demonstrate the advantages of nanostructure engineering in perovskite chiral devices.
Recent attempts to synthesize hybrid perovskites with large chirality have been hampered by large size mismatch and weak interaction between their structure and the wavelength of light. Here we adopt a planar nanostructure design to overcome these limitations and realize all-dielectric perovskite metasurfaces with giant superstructural chirality. We identify a direct spectral correspondence between the near- and the far- field chirality, and tune the electric and magnetic multipole moments of the resonant chiral metamolecules to obtain large anisotropy factor of 0.49 and circular dichroism of 6350 mdeg. Simulations show that larger area metasurfaces could yield even higher optical activity, approaching the theoretical limits. Our results clearly demonstrate the advantages of nanostructrure engineering for the implementation of perovskite chiral photonic, optoelectronic, and spintronic devices. Though chiral hybrid organic-inorganic perovskites are attractive for next-generation optoelectronics, imparting strong chirality through chemical synthesis has proved challenging. Here, the authors report all-dielectric perovskite metasurfaces with giant superstructural chirality via planar nanostructuring.
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