Chinese Optics Letters, Vol. 18, Issue 8, 082401 (2020)
Chromatic dispersion manipulation based on metasurface devices in the mid-infrared region
Lin Li1, Quan Yuan1, Run Chen1, Xiujuan Zou1, Wenbo Zang1, Tianyue Li1, Gaige Zheng1, Shuming Wang1,2,*, Zhenlin Wang1,**, and Shining Zhu1,2,***
- 1National Laboratory of Solid State Microstructures, School of Physics, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
- 2Key Laboratory of Intelligent Optical Sensing and Manipulation, Ministry of Education, Nanjing 210093, China
The chromatic aberration of metasurfaces limits their application. How to cancel or utilize the large chromatic dispersion of metasurfaces becomes an important issue. Here, we design Si-based metasurfaces to realize flexible chromatic dispersion manipulation in mid-infrared region. We demonstrate the broadband achromatic metalens and achromatic gradient metasurface to cancel the chromatic aberration over a continuous bandwidth (8–12 μm). In contrast, the metalens and gradient metasurface with enhanced chromatic dispersion have also been realized, where the focal length and deflection angle with different wavelengths vary more significantly than the conventional devices designed with geometric phase. These demonstrations indicate promising potential applications.
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