# Influence of Spike Geometry on Electromagnetic Field Enhancement and the Linear and Nonlinear Plasmonic Properties of Gold Nanourchins

https://mdr.nims.go.jp/datasets/86aace8d-6be7-42f2-aca3-fc2987d10b2d

## File

- [Manuscript of Au NUs _16September revised clean version_citation.pdf](https://mdr.nims.go.jp/filesets/75d2ea1c-19d5-49b3-aea0-d70e24763af9/download) ([Detail](https://mdr.nims.go.jp/filesets/75d2ea1c-19d5-49b3-aea0-d70e24763af9.md))

## Id

86aace8d-6be7-42f2-aca3-fc2987d10b2d

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-12-03T23:55:23.128112Z

## Updated at

2026-04-30T03:01:11.491392Z

## Published at

2026-09-28T23:46:31.794370Z

## Doi

https://doi.org/10.48505/nims.6118

## First published url

https://doi.org/10.1021/acsanm.5c03297

## Date published

2025-10-10

## Recorded date published

2025-10-10

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Influence of Spike Geometry on Electromagnetic Field Enhancement and the
    Linear and Nonlinear Plasmonic Properties of Gold Nanourchins
  title_type: original
  lang: en

## Description

- description: 'Wet-chemistry-synthesized gold nanourchins (Au NUs), characterized
    by spiky morphologies with spherical cores, exhibit complex and geometry-dependent
    plasmonic field enhancement properties distinct from those of symmetrical nanostructures.
    While plasmon hybridization and mode coupling in branched nanostructures have
    been broadly studied, the specific optical behavior of Au NUs─particularly regarding
    spike length distribution and ultrafast dynamics─remains underexplored. This study
    investigates the steady-state and transient absorption spectra of Au NUs with
    50–80 nm cores and 5–20 nm spikes, revealing multiple resonance bands. Transient
    absorption spectroscopy at various excitation wavelengths confirmed the presence
    of distinct resonances. Electromagnetic simulations based on TEM tomography-inspired
    models identified two key extinction bands: a green-wavelength dark mode resonance
    and a red/nIR spike-induced resonance attributed to the lightning rod effect.
    Simulations further showed that short, uniformly distributed spikes (aspect ratio
    ≤1) weakly excite dark resonances, while longer spikes (aspect ratio >1) induce
    hybridized longitudinal resonances and significant redshifts. Broad spike length
    distributions result in multiple coexisting resonances, aligning with experimental
    extinction spectra. A preliminary surface-enhanced Raman scattering study using
    2-naphthalene thiol confirmed stronger enhancement for long-spiked Au NUs under
    785 nm excitation, validating the field enhancement potential of the identified
    resonances.'
  description_type: abstract
  lang: und

## Creator

- name: Domantas Peckus
  role: author
- name: Fatima Albatoul Kasabji
  role: author
- name: Maziar Moussavi
  role: author
- name: Loic Vidal
  role: author
- name: Hana Boubaker
  role: author
- name: Asta Tamulevičienė
  role: author
- name: Arnaud Spangenberg
  role: author
- name: Tomas Tamulevičius
  role: author
- name: Joel Henzie
  role: author
  orcid: https://orcid.org/0000-0002-9190-2645
  organization: National Institute for Materials Science
- name: Karine Mougin
  role: author
- name: Sigitas Tamulevičius
  role: author

## Contact agent



## Publisher

organization: American Chemical Society (ACS)

## Managing organization



## Keyword

- subject: Plasmonics
  schema: not_defined
- subject: Surface enhanced Raman spectroscopy
  schema: not_defined
- subject: Nanoparticle
  schema: not_defined

## Rights

- description: This document is the Accepted Manuscript version of a Published Work
    that appeared in final form in ACS Applied Nano Materials, copyright © 2025 American
    Chemical Society after peer review and technical editing by the publisher. To
    access the final edited and published work see https://doi.org/10.1021/acsanm.5c03297.
  identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo

start_date: 2025-09-29
end_date: 2026-09-29

## Journal

- title: ACS Applied Nano Materials
  issn: '25740970'
  volume: '8'
  issue: '40'
  start_page: 19322
  end_page: 19332

## Conference



## Related item



## Funding

- identifier: MERANET-222
  funder_name: Lietuvos Mokslo Taryba

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



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## Process for specimen treatment



## Computational method



## Energy level/transition state



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## Fileset

- id: 75d2ea1c-19d5-49b3-aea0-d70e24763af9
  filename: Manuscript of Au NUs _16September revised clean version_citation.pdf
  content_type: application/pdf
  size: 1842501
  md5: '0963a97e4f852487fe4e429c2e91c249'

## Thumbnail

fileset_id: 75d2ea1c-19d5-49b3-aea0-d70e24763af9
filename: Manuscript of Au NUs _16September revised clean version_citation.pdf