Engineering the chromatic dispersion in dual-wavelength metalenses for unpolarized visible light

Zi-Hang Huo; Xiao-Ning Pang; Hong Wang; Zhi-Bin Fan; Xiang-Yang Yu; Jian-Wen Dong; Shao-Ji Jiang

doi:10.1117/12.2533715

17 May 2019 Engineering the chromatic dispersion in dual-wavelength metalenses for unpolarized visible light

Zi-Hang Huo, Xiao-Ning Pang, Hong Wang, Zhi-Bin Fan, Xiang-Yang Yu, Jian-Wen Dong, Shao-Ji Jiang

Proceedings Volume 11170, 14th National Conference on Laser Technology and Optoelectronics (LTO 2019); 111702H (2019) https://doi.org/10.1117/12.2533715
Event: Fourteenth National Conference on Laser Technology and Optoelectronics, 2019, Shanghai, China

Abstract

Chromatic dispersion represents the wavelength-dependent behavior of optical devices and limits their operation bandwidth. Due to the material dispersion restriction of refractive elements, dispersion engineering remains a challenge to imaging technology and optical communication. Recently, metalens offers an attractive approach to engineer the dispersion by introducing the additional degree of freedom with only a single layer of nanostructures. Here, we propose a method to design the dual-wavelength metalenses with controllable dispersion characteristic in transmission mode in the visible region. Three kinds of polarization-independent metalenses are demonstrated, including those with zero dispersion, positive axial dispersion, and negative axial dispersion. All the metalenses show high resolution with nearly diffraction-limited focusing. Our findings may provide an alternative way to design dual-wavelength functional devices in the fields of optical information processing, imaging technologies and complex fluorescence techniques.

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Zi-Hang Huo, Xiao-Ning Pang, Hong Wang, Zhi-Bin Fan, Xiang-Yang Yu, Jian-Wen Dong, and Shao-Ji Jiang "Engineering the chromatic dispersion in dual-wavelength metalenses for unpolarized visible light", Proc. SPIE 11170, 14th National Conference on Laser Technology and Optoelectronics (LTO 2019), 111702H (17 May 2019); https://doi.org/10.1117/12.2533715

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