Interfering Plasmons in Coupled Nanoresonators to Boost Light Localization and SERS.
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Authors
Zheng, Xuezhi
Publication Date
2021-03-24Journal Title
Nano Lett
ISSN
1530-6984
Publisher
American Chemical Society (ACS)
Volume
21
Issue
6
Pages
2512-2518
Language
eng
Type
Article
This Version
AM
Physical Medium
Print-Electronic
Metadata
Show full item recordCitation
Xomalis, A., Zheng, X., Demetriadou, A., Martínez, A., Chikkaraddy, R., & Baumberg, J. J. (2021). Interfering Plasmons in Coupled Nanoresonators to Boost Light Localization and SERS.. Nano Lett, 21 (6), 2512-2518. https://doi.org/10.1021/acs.nanolett.0c04987
Abstract
Plasmonic self-assembled nanocavities are ideal platforms for extreme light localization as they deliver mode volumes of <50 nm3. Here we show that high-order plasmonic modes within additional micrometer-scale resonators surrounding each nanocavity can boost light localization to intensity enhancements >105. Plasmon interference in these hybrid microresonator nanocavities produces surface-enhanced Raman scattering (SERS) signals many-fold larger than in the bare plasmonic constructs. These now allow remote access to molecules inside the ultrathin gaps, avoiding direct irradiation and thus preventing molecular damage. Combining subnanometer gaps with micrometer-scale resonators places a high computational demand on simulations, so a generalized boundary element method (BEM) solver is developed which requires 100-fold less computational resources to characterize these systems. Our results on extreme near-field enhancement open new potential for single-molecule photonic circuits, mid-infrared detectors, and remote spectroscopy.
Relationships
Is supplemented by: https://doi.org/10.17863/CAM.65547
Sponsorship
We acknowledge support from European Research Council (ERC) under Horizon 2020 research and innovation programme THOR (Grant Agreement No. 829067), POSEIDON (Grant Agreement No. 861950) and PICOFORCE (Grant Agreement No. 883703). We acknowledge funding from the EPSRC (Cambridge NanoDTC EP/ L015978/1, EP/L027151/1, EP/S022953/1, EP/P029426/1, and EP/R020965/1). R.C. acknowledges support from Trinity College, University of Cambridge. A.D. acknowledges support from the Royal Society University Research Fellowship URF/R1/180097 and Royal Society Research Fellows Enhancement Award RGF/EA/181038.
Funder references
Engineering and Physical Sciences Research Council (EP/L015978/1)
Engineering and Physical Sciences Research Council (EP/L027151/1)
Engineering and Physical Sciences Research Council (EP/S022953/1)
Engineering and Physical Sciences Research Council (EP/P029426/1)
Engineering and Physical Sciences Research Council (EP/R020965/1)
European Commission Horizon 2020 (H2020) Future and Emerging Technologies (FET) (829067)
European Commission Horizon 2020 (H2020) Research Infrastructures (RI) (861950)
European Commission Horizon 2020 (H2020) ERC (883703)
Engineering and Physical Sciences Research Council (EP/G060649/1)
Identifiers
External DOI: https://doi.org/10.1021/acs.nanolett.0c04987
This record's URL: https://www.repository.cam.ac.uk/handle/1810/318373
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