Temperature-responded tunable metalenses based on phase transition materials

• Published in: Chinese physics B Vol. 31; no. 5; pp. 54216 - 477
• Main Authors: Wu, Jing-Jun, Tang, Feng, Ma, Jun, Han, Bing, Wei, Cong, Li, Qing-Zhi, Chen, Jun, Zhang, Ning, Ye, Xin, Zheng, Wan-Guo, Zhu, Ri-Hong
• Format: Journal Article
• Language: English
• Published: Chinese Physical Society and IOP Publishing Ltd 01.04.2022; MIIT Key Laboratory of Advanced Solid Laser,Nanjing University of Science and Technology,Nanjing 210094,China%IFSA Collaborative Innovation Center,Shanghai Jiao Tong University,Shanghai 200240,China; MIIT Key Laboratory of Advanced Solid Laser,Nanjing University of Science and Technology,Nanjing 210094,China; School of Electronic and Optical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China; Research Center of Laser Fusion,China Academy of Engineering Physics,Mianyang 621900,China%Research Center of Laser Fusion,China Academy of Engineering Physics,Mianyang 621900,China%School of Electronic and Optical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China
• Subjects: phase change material VO; temperature-responded; tunable metalenses; temperature-responded; phase change material VO2; tunable metalenses
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/ac3cad

Once the metalenses are fabricated, the functions of most metalenses are invariable. The tunability and reconfigurability are useful and cost-saving for metalenses in realistic applications. We demonstrate this tunability here via a novel hybrid metalens with the strategic placement of an ultra-thin VO 2 layer. The hybrid metalens is capable of dynamically modulating the focusing intensity of transmitted light at a wavelength of 1550 nm, and demonstrate a 42.28% focusing efficiency of the incident light and 70.01% modulation efficiency. The hybrid metalens’ optothermal simulations show an optothermal conversion process of dynamic focusing, and a maximum laser density of 1.76×10 3 W/cm 2 can be handled at an ambient temperature lower than 330 K. The hybrid metalens proposed in this work, a light-dose sensitive tunable smart metalens that can protect other instruments/systems or materials from being damaged, has its specific applications such as in anti-satellite blinding, bio-imaging, etc .