Figure 2
From: Dielectric Huygens’ Metasurface for High-Efficiency Hologram Operating in Transmission Mode
(a) Phase modulation and transmission for different nanodisk radii while the nanodisk height is fixed at 120 nm. The phase modulation of 60 nm radius is set to be zero and all negative phases are changed to positive by adding 2π. The phase modulation and transmission of the chosen radii for the basic discrete elements of the hologram are indicated by circles and diamonds, respectively. The radii of the 7 level phase elements vary from 80 nm to 140 nm with an increment of 10 nm. (b) Surface electric polarizability and (c) magnetic polarizability for different phase modulation. The solid lines are calculated for an ideal Huygens’ metasurface while the circles and diamonds illustrate the actual values of the silicon nanodisks. (d) Phase map of the hologram retrieved from an adaptive GS algorithm.
