Figure 1
From: Electrically Tunable Gap Surface Plasmon-based Metasurface for Visible Light
Schematic of electrically-tuned metasurface. (a) A metallic V-shaped metasurface, an EO material layer and a metal layer form a GSP resonance cavity. External voltage is applied on the ultrathin ITO film adjacent to the bottom interface of the metasurface while the metal layer acts as a grounding electrode. A period of metasurface comprises eight antenna unit cells, being arranged parallel to x-axis. (b) A unit cell of the GSP cavity in the dashed frame of Fig. 1a. The period in x- and y-direction is P x and P y , respectively. The antenna, the ITO film, the EO material and the metal layer has a corresponding height of h an , h ITO, h EO and h m . (c) A V-shaped antenna has two l-long, w-wide arms splitting with an angle α. The angle between the symmetric axis and x-axis is β.
