Single-Layer Metasurface with Controllable Multiwavelength Functions

Abstract

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

Reconfigurable metasurface hologram by utilizing addressable dynamic pixels

“…With tailored artificial subwavelength building blocks, metasurfaces are able to manipulate the local and far-field light, thus enabling a new generation of ultrathin optical elements with a broad range of functionalities [1][2][3][4][5][6][7][8]. By utilizing metasurfaces as information carriers, metasurface holograms are able to store and reconstruct full wave information of target objects.…”

Spatial multiplexing plasmonic metalenses based on nanometer cross holes

“…Besides these single-function metasurface devices such as metalenses [19][20][21][22], wave plates [23][24][25] and optical vortex generators [26][27][28][29], multifunctional metasurfaces have been also proposed [30][31][32]. Zhao H et al presented a multiplexed vortex generator consisting of C-shaped slot array and realized orbital angular momentum multiplexing and demultiplexing in the terahertz band, but the polarization conversion efficiency is low [33].…”

Computational inverse design for cascaded systems of metasurface optics

“…One cannot independently solve the macroscale problem at each design wavelength, and then hope that a meta-atom geometry exists that achieves the correct phase at all desired wavelengths. Thirdly, while conventional lens design software is well suited for developing focusing optics and high-performance imaging systems, one may desire a metasurface to perform highly unusual functions where lightfocusing may not be the intended effect-such as projecting unique intensity distributions at different wavelengths [61,62], or acting as a layer of an optical neural network [63,64]. Finally, for optical systems composed of many unique metasurface layers, we do not wish for the computational complexity of the underlying design problem to scale with the increasing number of design variables.…”