Abstract
Waveplates are widely used in photonics to control the polarization of light1,2. Often, they are fabricated from birefringent crystals that have different refractive indices along and normal to the crystal axis. Similar optical components are found in the natural world, including the eyes of mantis shrimp3,4 and the iridescence of giant clams5, fish6 and plants7. Optical retardation in biology relies on sophisticated self-assembly, whereas man-made systems comprise multiple-layered materials8,9,10,11. Here we report a discovery that bridges these two design principles. We observe wideband achromatic retardation in the visible and near-infrared (532–800 nm) regions for Cs4PbBr6 perovskite crystals embedded with CsPbBr3 nanocrystals. We explain our observations as matched dispersions of the refractive indices of the ordinary and extraordinary rays caused by the ordered embedding of the nanocrystals in the host. The wideband performance and ease of fabrication of these perovskite materials are attractive for future applications.
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Data availability
Source data are provided with this paper. All other data that support the plots within this paper and other findings of this study are available from the corresponding authors upon reasonable request.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (61722502, 61727808 and 12074037), the National Natural Science Foundation of China and Research Grants Council Joint Research Scheme (51761165021). G.D.S. acknowledges the Bio-Inspired Energy Program of CIFAR. We thank C. Ding for measuring the Tyndall light scattering, Y. Ge for fabricating the CdxZn1−xSeyS1−y@silica monolith, E. H. Sargent and R. Quintero-Bermudez for structural analysis, K. Shi for helpful discussions on the polarization measurement. We would like to thank BIT Experimental Center of Advanced Materials for providing the experimental equipments.
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H.Z. conceived and supervised the project. X.C., W.-g.L. and J.T. fabricated the materials. X.C., W.-g.L. and Y.W. carried out the spectroscopic measurements. Y.Z. proposed the theoretical model and performed the fitting. H.Z., G.D.S., X.C., Y.W. and Y.Z. wrote the manuscript with contribution from all the authors.
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Chen, X., Lu, Wg., Tang, J. et al. Solution-processed inorganic perovskite crystals as achromatic quarter-wave plates. Nat. Photon. 15, 813–816 (2021). https://doi.org/10.1038/s41566-021-00865-0
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DOI: https://doi.org/10.1038/s41566-021-00865-0
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