近日，美国威斯康星大学麦迪逊分校的Mikhail A. Kats及其研究小组取得一项新进展。经过不懈努力，他们成功开发出用于中红外开关，限制和非线性隔离的电调谐二氧化钒-金属超表面。相关研究成果已于2023年11月20日在《自然—光子学》期刊上发表。
该研究团队成功开发出一种适用于中波红外区域的电控二氧化钒（VO2）金属超表面，它同时具有可调谐光开关、具有可调谐限制阈值的光限制器和具有可调谐工作范围的非线性光隔离器的功能。可调谐性是通过包含超表面的金属的焦耳加热来实现的，从而产生集成光电器件。作为光开关使用时，实验结果显示，在改变偏置电流的情况下，该器件的传输率可达到约100。作为光限制器时，研究人员演示了限制阈值从20到180 mW的入射激光功率的可调谐性。此外，非线性光学隔离也实现了类似的可调谐程度，从而实现了非对称（非互易）传输。
附：英文原文
Title: Electrically tunable VO2–metal metasurface for mid-infrared switching, limiting and nonlinear isolation
Author: King, Jonathan, Wan, Chenghao, Park, Tae Joon, Deshpande, Sanket, Zhang, Zhen, Ramanathan, Shriram, Kats, Mikhail A.
Issue&Volume: 2023-11-20
Abstract: We demonstrate an electrically controlled vanadium dioxide (VO2)–metal metasurface for the mid-wave infrared regime that simultaneously functions as a tunable optical switch, an optical limiter with a tunable limiting threshold and a nonlinear optical isolator with a tunable operating range. The tunability is achieved via Joule heating through the metal comprising the metasurface, resulting in an integrated optoelectronic device. As an optical switch, the device has an experimental transmission ratio of ~100 when varying the bias current. Operating as an optical limiter, we demonstrated the tunability of the limiting threshold from 20 to 180 mW of incident laser power. Similar degrees of tunability are also achieved for nonlinear optical isolation, which enables asymmetric (non-reciprocal) transmission.
DOI: 10.1038/s41566-023-01324-8
Source: https://www.nature.com/articles/s41566-023-01324-8