Phototunable Dielectric Huygens' Metasurfaces.

TitlePhototunable Dielectric Huygens' Metasurfaces.
Publication TypeJournal Article
Year of Publication2018
AuthorsK Fan, J Zhang, X Liu, G-F Zhang, RD Averitt, and WJ Padilla
JournalAdvanced materials (Deerfield Beach, Fla.)
Volume30
Issue22
Start Pagee1800278
Date Published05/2018
Abstract

Conventional dielectric metasurfaces achieve their properties through geometrical tuning and consequently are static. Although some unique properties are demonstrated, the usefulness for realistic applications is thus inherently limited. Here, control of the resonant eigenmodes supported by Huygens' metasurface (HMS) absorbers through optical excitation is proposed and demonstrated. An intensity transmission modulation depth of 99.93% is demonstrated at 1.03 THz, with an associated phase change of greater than π/2 rad. Coupled mode theory and S-parameter simulations are used to elucidate the mechanism underlying the dynamics of the metasurface and it is found that the tuning is primarily governed by modification of the magnetic dipole-like odd eigenmode, which both lifts the degeneracy, and eliminates critical coupling. The dynamic HMS demonstrates wide tunability and versatility which is not limited to the spectral range demonstrated, offering a new path for reconfigurable metasurface applications.

DOI10.1002/adma.201800278
Short TitleAdvanced materials (Deerfield Beach, Fla.)