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Nonlinear Anisotropic Dielectric Metasurfaces for Ultrafast Nanophotonics

Valle, G Della; Hopkins, Ben; Ganzer, Lucia; Stoll, Tatjana; Rahmani, Mohsen; Longhi, Stefano; Kivshar, Yuri; De Angelis, Constantino; Neshev, Dragomir; Cerullo, Giulio


We report on the broadband transient optical response of anisotropic, amorphous silicon nanobricks that exhibit Mie-type resonances. A quantitative model is developed to identify and disentangle the three physical processes that govern the ultrafast changes of the nanobrick optical properties, namely, two-photon absorption, free-carrier relaxation, and lattice heating. We reveal a set of operating windows where ultrafast all-optical modulation of transmission is achieved with full return to...[Show more]

CollectionsANU Research Publications
Date published: 2017
Type: Journal article
Source: ACS Photonics
DOI: 10.1021/acsphotonics.7b00544


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