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Article

Broadband Achromatic Metasurfaces for Longwave Infrared Applications

1
Key Laboratory of Optical System Advanced Manufacturing Technology, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
2
College of Da Heng, University of the Chinese Academy of Sciences, Beijing 100039, China
3
Jilin Provincial Key Laboratory of Advanced Optoelectronic Equipment and Instrument Manufacturing Technology, Changchun 130033, China
*
Author to whom correspondence should be addressed.
Academic Editor: Rodolphe Antoine
Nanomaterials 2021, 11(10), 2760; https://doi.org/10.3390/nano11102760
Received: 9 September 2021 / Revised: 13 October 2021 / Accepted: 14 October 2021 / Published: 18 October 2021
Longwave infrared (LWIR) optics are essential for several technologies, such as thermal imaging and wireless communication, but their development is hindered by their bulk and high fabrication costs. Metasurfaces have recently emerged as powerful platforms for LWIR integrated optics; however, conventional metasurfaces are highly chromatic, which adversely affects their performance in broadband applications. In this work, the chromatic dispersion properties of metasurfaces are analyzed via ray tracing, and a general method for correcting chromatic aberrations of metasurfaces is presented. By combining the dynamic and geometric phases, the desired group delay and phase profiles are imparted to the metasurfaces simultaneously, resulting in good achromatic performance. Two broadband achromatic metasurfaces based on all-germanium platforms are demonstrated in the LWIR: a broadband achromatic metalens with a numerical aperture of 0.32, an average intensity efficiency of 31%, and a Strehl ratio above 0.8 from 9.6 μm to 11.6 μm, and a broadband achromatic metasurface grating with a constant deflection angle of 30° from 9.6 μm to 11.6 μm. Compared with state-of-the-art chromatic-aberration-restricted LWIR metasurfaces, this work represents a substantial advance and brings the field a step closer to practical applications. View Full-Text
Keywords: achromatic metalens; achromatic metasurface grating; longwave infrared; dynamic phase; Pancharatnam–Berry phase achromatic metalens; achromatic metasurface grating; longwave infrared; dynamic phase; Pancharatnam–Berry phase
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MDPI and ACS Style

Song, N.; Xu, N.; Shan, D.; Zhao, Y.; Gao, J.; Tang, Y.; Sun, Q.; Chen, X.; Wang, Y.; Feng, X. Broadband Achromatic Metasurfaces for Longwave Infrared Applications. Nanomaterials 2021, 11, 2760. https://doi.org/10.3390/nano11102760

AMA Style

Song N, Xu N, Shan D, Zhao Y, Gao J, Tang Y, Sun Q, Chen X, Wang Y, Feng X. Broadband Achromatic Metasurfaces for Longwave Infrared Applications. Nanomaterials. 2021; 11(10):2760. https://doi.org/10.3390/nano11102760

Chicago/Turabian Style

Song, Naitao, Nianxi Xu, Dongzhi Shan, Yuanhang Zhao, Jinsong Gao, Yang Tang, Qiao Sun, Xin Chen, Yansong Wang, and Xiaoguo Feng. 2021. "Broadband Achromatic Metasurfaces for Longwave Infrared Applications" Nanomaterials 11, no. 10: 2760. https://doi.org/10.3390/nano11102760

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