Interfering plasmons in coupled nanoresonators to boost light localisation and SERS

Angelos Xomalis; Xuezhi Zheng; Angela Demetriadou; Alejandro Martinez; Rohit Chikkaraddy; Jeremy J. Baumberg

doi:10.1021/acs.nanolett.0c04987

Interfering plasmons in coupled nanoresonators to boost light localisation and SERS

Angelos Xomalis, Xuezhi Zheng, Angela Demetriadou, Alejandro Martinez, Rohit Chikkaraddy, Jeremy J. Baumberg^*

^*Corresponding author for this work

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

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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.

Original language	English
Pages (from-to)	2512–2518
Number of pages	7
Journal	Nano Letters
Volume	21
Issue number	6
Early online date	11 Mar 2021
DOIs	https://doi.org/10.1021/acs.nanolett.0c04987
Publication status	Published - 24 Mar 2021

Bibliographical note

Funding Information:
We acknowledge support from the European Research Council (ERC) under the Horizon 2020 Research and Innovation Programme THOR (829067), POSEIDON (861950) and PICOFORCE (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 the Royal Society Research Fellows Enhancement Award RGF/EA/181038.

Publisher Copyright:
© 2021 American Chemical Society. All rights reserved.

Keywords

Nanocavity
SERS
field enhancement
nano-optics
near-field
plasmon interference
remote excitation

ASJC Scopus subject areas

Condensed Matter Physics
Mechanical Engineering
Bioengineering
General Chemistry
General Materials Science

Access to Document

10.1021/acs.nanolett.0c04987Licence: Creative Commons: Attribution (CC BY)

XomalisA2021Interfering Final published version, 1.98 MBLicence: Creative Commons: Attribution (CC BY)

Plasmons and Molecules: Photochemistry in the Light-Matter Strong Coupling Regime (Dr Angela Demetriadou)
Demetriadou, A.
The Royal Society
1/10/18 → 16/02/24
Project: Research Councils
Light-matter strong coupling for quantum nanoplasmonics
Demetriadou, A.
The Royal Society
1/10/18 → 31/12/22
Project: Research Councils

Cite this

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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.",

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note = "Funding Information: We acknowledge support from the European Research Council (ERC) under the Horizon 2020 Research and Innovation Programme THOR (829067), POSEIDON (861950) and PICOFORCE (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 the Royal Society Research Fellows Enhancement Award RGF/EA/181038. Publisher Copyright: {\textcopyright} 2021 American Chemical Society. All rights reserved.",

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AU - Baumberg, Jeremy J.

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N2 - 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.

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Interfering plasmons in coupled nanoresonators to boost light localisation and SERS

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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Projects

Plasmons and Molecules: Photochemistry in the Light-Matter Strong Coupling Regime (Dr Angela Demetriadou)

Light-matter strong coupling for quantum nanoplasmonics

Cite this