Single-Layer Metasurface with Controllable Multiwavelength Functions

• DOI: 10.1021/acs.nanolett.7b05458
• Publication Date: 2018-02-20T21:27:37Z
• Authors: Zhujun Shi; Mohammadreza Khor...; Yao-Wei Huang; Charles Roques-Ca...; Alexander Y. Zhu; Wei Ting Chen; Vyshakh Sanjeev; Zhao-Wei Ding; Michele Tamagnone; Kundan Chaudhary; Robert C. Devlin; Cheng-Wei Qiu; Federico Capasso
• Keywords: Achromatic lens; RGB color model; Light beam; Spatial light modulator

In this paper, we report dispersion-engineered metasurfaces with distinct functionalities controlled by wavelength. Unlike previous approaches based on spatial multiplexing or vertical stacking of metasurfaces, utilize a single phase profile wavelength dependence encoded in the shifters' dispersion. We designed and fabricated multiwavelength achromatic metalens (MAM) focusing for blue (B), green (G), yellow (Y), red (R) light two wavelength-controlled beam generators (WCBG): one focuses orbital angular momentum (OAM) states (l = 0,1,2) corresponding to three primary colors; other produces ordinary focal spots 0) light, while generating vortex 1) blue. A full color (RGB) hologram is also demonstrated simulation. Our approach opens path applications ranging from near-eye displays holography compact generation.