Sub-20 fs all-optical switching in a single Au-Clad Si nanodisk

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Title: Sub-20 fs all-optical switching in a single Au-Clad Si nanodisk
Authors: Grinblat, G
Berte, R
Nielsen, MP
Li, Y
Oulton, RF
Maier, SA
Item Type: Journal Article
Abstract: Dielectric nanoantennas have recently emerged as promising elements for nonlinear and ultrafast nanophotonics due to their ability to concentrate light on the nanometer scale with low losses, while exhibiting large nonlinear susceptibilities. In this work, we demonstrate that single Si nanodisks covered with a thin 30 nm thick layer of Au can generate positive and negative sub-20 fs reflectivity modulations of ∼0.3% in the vicinity of the first-order anapole mode, when excited around the second-order anapole mode. The experimental results, characterized in the visible to near-infrared spectral range, suggest that the nonlinear optical Kerr effect is the responsible mechanism for the observed all-optical switching phenomena. These findings represent an important step toward nanoscale ultrafast all-optical signal processing.
Issue Date: 12-Dec-2018
Date of Acceptance: 1-Nov-2018
ISSN: 1530-6984
Publisher: American Chemical Society
Start Page: 7896
End Page: 7900
Journal / Book Title: Nano Letters
Volume: 18
Issue: 12
Copyright Statement: © 2018 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, after peer review and technical editing by the publisher. To access the final edited and published work see
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Funder's Grant Number: EP/K503381/1
Keywords: Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Science & Technology - Other Topics
Materials Science
Dielectric nanoantennas
pump-probe spectroscopy
ultrafast all-optical switching
optical Kerr effect
anapole modes
pump−probe spectroscopy
MD Multidisciplinary
Publication Status: Published
Embargo Date: 2019-11-18
Online Publication Date: 2018-11-18
Appears in Collections:Physics
Experimental Solid State
Faculty of Natural Sciences

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