Enhanced third harmonic generation in single Germanium nanodisks excited at the anapole mode

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Title: Enhanced third harmonic generation in single Germanium nanodisks excited at the anapole mode
Authors: Grinblat, G
Li, Y
Nielsen, MP
Oulton, R
Maier, SA
Item Type: Journal Article
Abstract: We present an all-dielectric germanium nanosystem exhibiting a strong third order nonlinear response and efficient third harmonic generation in the optical regime. A thin germanium nanodisk shows a pronounced valley in its scattering cross section at the dark anapole mode, while the electric field energy inside the disk is maximized due to high confinement within the dielectric. We investigate the dependence of the third harmonic signal on disk size and pump wavelength to reveal the nature of the anapole mode. Each germanium nanodisk generates a high effective third order susceptibility of χ((3)) = 4.3 × 10(-9) esu, corresponding to an associated third harmonic conversion efficiency of 0.0001% at an excitation wavelength of 1650 nm, which is 4 orders of magnitude greater than the case of an unstructured germanium reference film. Furthermore, the nonlinear conversion via the anapole mode outperforms that via the radiative dipolar resonances by about 1 order of magnitude, which is consistent with our numerical simulations. These findings open new possibilities for the optimization of upconversion processes on the nanoscale through the appropriate engineering of suitable dielectric materials.
Issue Date: 24-Jun-2016
Date of Acceptance: 22-Jun-2016
ISSN: 1530-6992
Publisher: American Chemical Society
Start Page: 4635
End Page: 4640
Journal / Book Title: Nano Letters
Volume: 16
Issue: 7
Copyright Statement: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Sponsor/Funder: The Royal Society
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Office Of Naval Research (USA)
Funder's Grant Number: WM110079
Keywords: All-dielectric nanodisks
anapole mode
electric field enhancement
third harmonic generation
Nanoscience & Nanotechnology
MD Multidisciplinary
Publication Status: Published
Appears in Collections:Physics
Experimental Solid State
Faculty of Natural Sciences

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