Dou Yixuan, Tumusange Marie Solange, Jin Jianbo, Wang Xiaoming, Crater Erin R, Liu Sunhao, Zhu Liyan, Zuberi Samir, Harman Gavin, Weaver Conner, Ramanujam Balaji, Shan Ambalanath, Moore Robert B, Podraza Nikolas J, Yan Yanfa, Quan Lina
Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States.
Department of Physics and Astronomy and Wright Center for Photovoltaics Innovation and Commercialization, The University of Toledo, Toledo, Ohio 43606, United States.
J Am Chem Soc. 2023 Aug 16;145(32):18007-18014. doi: 10.1021/jacs.3c05705. Epub 2023 Aug 4.
Achromatic quarter waveplates (A-QWPs), traditionally constructed from multiple birefringent crystals, can modulate light polarization and retardation across a broad range of wavelengths. This mechanism is inherently related to phase retardation controlled by the fast and slow axis of stacked multi-birefringent crystals. However, the conventional design of A-QWPs requires the incorporation of multiple birefringent crystals, which complicates the manufacturing process and raises costs. Here, we report the discovery of a broadband (540-1060 nm) A-QWP based on a two-dimensional (2D) layered hybrid copper halide (HCH) perovskite single crystal. The 2D copper chloride (CuCl) layers of the HCH crystal undergo Jahn-Teller distortion and subsequently trigger the in-plane optical birefringence. Its broad range of the wavelength response as an A-QWP is a consequence of the out-of-plane mosaicity formed among the stacked inorganic layers during the single-crystal self-assembly process in the solution phase. Given the versatility of 2D hybridhalide perovskites, the 2D HCH crystal offers a promising approach for designing cost-effective A-QWPs and the ability to integrate other optical devices.
