英国曼彻斯特大学Kostya S. Novoselov团队近日揭示二硫化锗可作为一种高折射率、透明的紫外可见纳米光子学材料。相关论文于2025年6月18日发表在《光：科学与应用》杂志上。

由于其创纪录的高折射率和巨大的光学各向异性，范德华（vdW）材料加速了纳米光子学的发展。然而，传统的高折射率材料，如二氧化钛（TiO₂），在最重要的可见光范围内仍然占主导地位。这是由于目前在整个可见光谱范围内缺乏透明的vdW材料。

在此背景下，研究组提出二硫化锗（GeS₂）可以提供一个重大突破。GeS₂具有高折射率、可忽略的损耗和整个可见光范围内的双轴光学各向异性，有可能补充TiO₂，缩小vdW材料在可见光谱中的应用差距。添加GeS₂可能会对从紫外到红外的任何工作波长的范德华纳米光子电路的设计产生深远的影响，强调了GeS₂对纳米光子学领域潜在影响的重要性。

附：英文原文

Title: Germanium disulfide as an alternative high refractive index and transparent material for UV-visible nanophotonics

Author: Slavich, Aleksandr S., Ermolaev, Georgy A., Zavidovskiy, Ilya A., Grudinin, Dmitriy V., Kravtsov, Konstantin V., Tatmyshevskiy, Mikhail K., Mironov, Mikhail S., Toksumakov, Adilet N., Tselikov, Gleb I., Fradkin, Ilia M., Voronin, Kirill V., Povolotskiy, Maksim R., Matveeva, Olga G., Syuy, Alexander V., Yakubovsky, Dmitry I., Tsymbarenko, Dmitry M., Kruglov, Ivan, Ghazaryan, Davit A., Novikov, Sergey M., Vyshnevyy, Andrey A., Arsenin, Aleksey V., Volkov, Valentyn S., Novoselov, Kostya S.

Issue&Volume: 2025-06-18

Abstract: Thanks to their record high refractive index and giant optical anisotropy, van der Waals (vdW) materials have accelerated the development of nanophotonics. However, traditional high refractive index materials, such as titanium dioxide (TiO2), still dominate in the most important visible range. This is due to the current lack of transparent vdW materials across the entire visible spectrum. In this context, we propose that germanium disulfide (GeS2) could offer a significant breakthrough. With its high refractive index, negligible losses, and biaxial optical anisotropy across the whole visible range, GeS2 has the potential to complement TiO2 and close the application gap of vdW materials in the visible spectrum. The addition of GeS2 could have a profound impact on the design of van der Waals nanophotonic circuits for any operation wavelength from ultraviolet to infrared, emphasizing the significance of the potential impact of GeS2 on the field of nanophotonics.

DOI: 10.1038/s41377-025-01886-y

Source: https://www.nature.com/articles/s41377-025-01886-y