Dense arrays of nanohelices: raman scattering from achiral molecules reveals the near-field enhancements at chiral metasurfaces

Robin R. Jones, Cornelia Miksch, Hyunah Kwon, Coosje Pothoven, Kristina R. Rusimova, Maarten Kamp, Kedong Gong, Liwu Zhang, Tim Batten, Brian Smith, Alejandro V. Silhanek, Peer Fischer, Daniel Wolverson, Ventsislav K. Valev

Research output: Contribution to journalArticlepeer-review

4 Citations (SciVal)

Abstract

Against the background of the current healthcare and climate emergencies, surface enhanced Raman scattering (SERS) is becoming a highly topical technique for identifying and fingerprinting molecules, e.g., within viruses, bacteria, drugs, and atmospheric aerosols. Crucial for SERS is the need for substrates with strong and reproducible enhancements of the Raman signal over large areas and with a low fabrication cost. Here, dense arrays of plasmonic nanohelices (≈100 nm in length), which are of interest for many advanced nanophotonics applications, are investigated, and they are shown to present excellent SERS properties. As an illustration, two new ways to probe near-field enhancement generated with circular polarization at chiral metasurfaces are presented, first using the Raman spectra of achiral molecules (crystal violet) and second using a single, element-specific, achiral molecular vibrational mode (i.e., a single Raman peak). The nanohelices can be fabricated over large areas at a low cost and they provide strong, robust and uniform Raman enhancement. It is anticipated that these advanced materials will find broad applications in surface enhanced Raman spectroscopies and material science.

Original languageEnglish
Article number2209282
Number of pages12
JournalAdvanced Materials
Volume35
Issue number34
Early online date7 Feb 2023
DOIs
Publication statusPublished - 24 Aug 2023

Bibliographical note

Royal Society - RGF\EA\180228, ICA\R1\201088
ESRC Engineering and Physical Sciences Research Council - EP/T001046/1
Fonds De La Recherche Scientifique - FNRS - PDR T.0204.21

Funding Information:
V.K.V. acknowledges support from the Royal Society through the University Research Fellowships and the Royal Society grants PEF1\170015 and RGF\EA\180228, as well as the EPSRC grant EP/T001046/1. The work of A.V.S. is partially supported by PDR T.0204.21 of the F.R.S.‐FNRS. R.R.J acknowledges support from Renishaw Plc (Wotton‐under‐Edge) and the Material and Chemical Characterisation Facility (MC ‐ Dept. of Physics, University of Bath). R.R.J. also thanks Philip Fletcher and Jake Masters, Dept. of Physics, University of Bath, for their assistance and Wanli Liu in the Dept. of Chemistry, University of Bath, for his assistance with spin‐coating. V.K.V. and L.Z. acknowledge the International Collaboration Awards 2020 of the Royal Society (ICA/R1/201088). 2

Data Availability Statement

The data that support the findings of this study are openly available in the repository of the University of Bath at https://doi.org/10.15125/BATH-01112

Keywords

  • Raman spectroscopy
  • chiral materials
  • metasurfaces
  • plasmonics
  • surface enhanced Raman spectroscopy

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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