Defect-induced nonlinearity in 2D nanoparticles
Defect-induced nonlinearity in 2D nanoparticles
Optical nonlinearity depends on symmetry and symmetries vanish in the presence of defects. Vacancy defects in centrosymmetric crystals and thin films are a well-known source of even-order optical nonlinearity, e.g. causing second harmonic generation. The emerging ability to manipulate defects in two-dimensional materials and nanoparticles provides an opportunity for engineering of optical nonlinearity. Here, we demonstrate the effect of defects on the nonlinear optical response of two-dimensional dielectric nanoparticles. Using a toy model, where bound optical electrons of linear atoms are coupled by nonlinear Coulomb interactions, we model defect-induced nonlinearity. We find that defects at particle edges contribute strongly to even-order optical nonlinearity and that unique nonlinear signatures of different defect states could provide the smallest conceivable QR-codes and extremely high density optical data storage, in principle approaching 1 bit per atom.
2D materials, QR codes, harmonic generation, nanoparticles, nonlinear optics, sum frequency generation
7162-7168
Xu, Jie
9221b478-b998-445a-8719-67f535043748
Plum, Eric
50761a26-2982-40df-9153-7aecc4226eb5
17 February 2022
Xu, Jie
9221b478-b998-445a-8719-67f535043748
Plum, Eric
50761a26-2982-40df-9153-7aecc4226eb5
Xu, Jie and Plum, Eric
(2022)
Defect-induced nonlinearity in 2D nanoparticles.
Optics Express, 30 (5), .
(doi:10.1364/OE.443977).
Abstract
Optical nonlinearity depends on symmetry and symmetries vanish in the presence of defects. Vacancy defects in centrosymmetric crystals and thin films are a well-known source of even-order optical nonlinearity, e.g. causing second harmonic generation. The emerging ability to manipulate defects in two-dimensional materials and nanoparticles provides an opportunity for engineering of optical nonlinearity. Here, we demonstrate the effect of defects on the nonlinear optical response of two-dimensional dielectric nanoparticles. Using a toy model, where bound optical electrons of linear atoms are coupled by nonlinear Coulomb interactions, we model defect-induced nonlinearity. We find that defects at particle edges contribute strongly to even-order optical nonlinearity and that unique nonlinear signatures of different defect states could provide the smallest conceivable QR-codes and extremely high density optical data storage, in principle approaching 1 bit per atom.
Text
Defect-induced nonlinearity - accepted manuscript
- Accepted Manuscript
More information
Accepted/In Press date: 13 December 2021
Published date: 17 February 2022
Additional Information:
Funding Information:
Funding. China Scholarship Council (201706310145); Engineering and Physical Sciences Research Council (EP/M009122/1, EP/T02643X/1).
Publisher Copyright:
© 2022 OSA - The Optical Society. All rights reserved.
Keywords:
2D materials, QR codes, harmonic generation, nanoparticles, nonlinear optics, sum frequency generation
Identifiers
Local EPrints ID: 453167
URI: http://eprints.soton.ac.uk/id/eprint/453167
ISSN: 1094-4087
PURE UUID: 64973029-e3ea-425e-a27f-dd08c97072d5
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Date deposited: 10 Jan 2022 17:51
Last modified: 17 Mar 2024 07:01
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Author:
Jie Xu
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