Publications of the Research Group Computational Photonics

Prof. Dr. Antonio Calà Lesina

Tunable plasmonic metasurfaces for optical phased arrays

authored by
Antonino Cala Lesina, Dominic Goodwill, Eric Bernier, Lora Ramunno, Pierre Berini

Controlling the phase and amplitude of light emitted by the elements (i.e., pixels) of an optical phased array is of paramount importance to realizing dynamic beam steering for LIDAR applications. In this paper, we propose a plasmonic pixel composed of a metallic nanoantenna covered by a thin oxide layer, and a conductive oxide, e.g., ITO, for use in a reflectarray metasurface. By considering voltage biasing of the nanoantenna via metallic connectors, and exploiting the carrier refraction effect in the metal-oxide-semiconductor capacitor in the accumulation and depletion regions, our simulations predict control of the reflection coefficient phase over a range >330^{\circ } with a nearly constant magnitude. We discuss the physical mechanism underlying the optical response, the effect of the connectors, and propose strategies to maximize the magnitude of the reflection coefficient and to achieve dual-band operation. The suitability of our plasmonic pixel design for beam steering in LIDAR is demonstrated via 3D-FDTD simulations.

External Organisation(s)
University of Ottawa
Huawei Technologies Canada Co. Ltd.
IEEE Journal of Selected Topics in Quantum Electronics
Publication date
Publication status
Peer reviewed
ASJC Scopus subject areas
Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering
Electronic version(s) (Access: Open)