Maccaferri, N., Zilli, A., Isoniemi, T. orcid.org/0000-0003-0238-1006 et al. (5 more authors) (2021) Enhanced nonlinear emission from single multilayered metal–dielectric nanocavities resonating in the near-infrared. ACS Photonics, 8 (2). pp. 512-520. ISSN 2330-4022
Abstract
Harmonic generation mechanisms are of great interest in nanoscience and nanotechnology, since they allow generating visible light by using near-infrared radiation, which is particularly suitable for its countless applications in bionanophotonics and optoelectronics. In this context, multilayer metal–dielectric nanocavities are widely used for light confinement and waveguiding at the nanoscale. They exhibit intense and localized resonances that can be conveniently tuned in the near-infrared and are therefore ideal for enhancing nonlinear effects in this spectral range. In this work, we experimentally investigate the nonlinear emission properties of multilayer metal–dielectric nanocavities. By engineering their absorption efficiency and exploiting their intrinsic interface-induced symmetry breaking, we achieve an almost 2 orders of magnitude higher second-harmonic generation efficiency compared to gold nanostructures featuring the same geometry and optical resonant behavior. In particular, while both the third-order nonlinear susceptibility and conversion efficiency are comparable with those of the Au nanoresonators, we estimate a second-order nonlinear susceptibility of the order of 1 pm/V, which is comparable with that of typical nonlinear crystals. We envision that our system, which combines the advantages of both plasmonic and dielectric materials, might enable the realization of composite and multifunctional nanosystems for the efficient manipulation of nonlinear optical processes at the nanoscale.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2021 American Chemical Society. This is an open access article published under a Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited. |
Dates: |
|
Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 08 Mar 2021 14:15 |
Last Modified: | 08 Mar 2021 14:15 |
Status: | Published |
Publisher: | American Chemical Society (ACS) |
Refereed: | Yes |
Identification Number: | 10.1021/acsphotonics.0c01500 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:170950 |