Ermolaev Georgy, Pushkarev Anatoly P, Zhizhchenko Alexey, Kuchmizhak Aleksandr A, Iorsh Ivan, Kruglov Ivan, Mazitov Arslan, Ishteev Arthur, Konstantinova Kamilla, Saranin Danila, Slavich Aleksandr, Stosic Dusan, Zhukova Elena S, Tselikov Gleb, Di Carlo Aldo, Arsenin Aleksey, Novoselov Kostya S, Makarov Sergey V, Volkov Valentyn S
Emerging Technologies Research Center, XPANCEO, Dubai 00000, United Arab Emirates.
Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, Dolgoprudny 141700, Russia.
Nano Lett. 2023 Apr 12;23(7):2570-2577. doi: 10.1021/acs.nanolett.2c04792. Epub 2023 Mar 15.
During the last years, giant optical anisotropy has demonstrated its paramount importance for light manipulation. In spite of recent advances in the field, the achievement of continuous tunability of optical anisotropy remains an outstanding challenge. Here, we present a solution to the problem through the chemical alteration of halogen atoms in single-crystal halide perovskites. As a result, we manage to continually modify the optical anisotropy by 0.14. We also discover that the halide perovskite can demonstrate optical anisotropy up to 0.6 in the visible range─the largest value among non-van der Waals materials. Moreover, our results reveal that this anisotropy could be in-plane and out-of-plane depending on perovskite shape─rectangular and square. As a practical demonstration, we have created perovskite anisotropic nanowaveguides and shown a significant impact of anisotropy on high-order guiding modes. These findings pave the way for halide perovskites as a next-generation platform for tunable anisotropic photonics.
在过去几年中，巨大的光学各向异性已证明其在光操纵方面的至关重要性。尽管该领域最近取得了进展，但实现光学各向异性的连续可调性仍然是一个突出的挑战。在此，我们通过对单晶卤化物钙钛矿中卤素原子进行化学改变来提出该问题的解决方案。结果，我们成功地将光学各向异性连续改变了0.14。我们还发现，卤化物钙钛矿在可见光范围内可表现出高达0.6的光学各向异性——这是范德华材料以外的材料中的最大值。此外，我们的结果表明，这种各向异性可能是面内和面外的，这取决于钙钛矿的形状——矩形和正方形。作为一个实际演示，我们制造了钙钛矿各向异性纳米波导，并展示了各向异性对高阶导模的显著影响。这些发现为卤化物钙钛矿作为下一代可调谐各向异性光子学平台铺平了道路。
