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All-dielectric metasurfaces comprising arrays of nanostructured high-refractive-index materials are re-imagining what is achievable in terms of the manipulation of light. However, the functionality of conventional dielectric-based metasurfaces is fixed by design; thus, their optical response is locked in at the fabrication stage. A far wider range of applications could be addressed if dynamic and reconfigurable control were possible. We demonstrate this here via the novel concept of hybrid metasurfaces, in which reconfigurability is achieved by embedding sub-wavelength inclusions of chalcogenide phase-change materials within the body of silicon nanoresonators. By strategic placement of an ultra-thin Ge_2Sb_2Te_5 layer and reversible switching of its phase-state, we show individual, multilevel, and dynamic control of metasurface resonances. We showcase our concept via the design, fabrication, and …
Optical Society of America
Publication date: 
20 May 2020

Carlota Ruiz de Galarreta, Ivan Sinev, Arseny M Alexeev, Pavel Trofimov, Konstantin Ladutenko, Santiago Garcia-Cuevas Carrillo, Emanuele Gemo, Anna Baldycheva, Jacopo Bertolotti, C David Wright

Biblio References: 
Volume: 7 Issue: 5 Pages: 476-484