Chiroptical response of aluminum nanocrescents at ultraviolet wavelengths

Matthew S. Davis, Wenqi Zhu, Jared Strait, Jay K. Lee, Henri J. Lezec, Steve Blair, Amit Agrawal

Research output: Contribution to journalArticle

Abstract

Manipulation of plasmon modes at ultraviolet wavelengths using engineered nanophotonic devices allows for the development of high-sensitivity chiroptical spectroscopy systems. We present here an experimental framework based on aluminum-based crescent-shaped nanostructures that exhibit a strong chiroptical response at ultraviolet wavelengths. Through utilization of higher-order plasmon modes in wavelength-scale nanostructures, we address the inherent fabrication challenges in scaling the response to higher frequencies. Additionally, the distinct far-field spectral response types are analyzed within a coupled-oscillator model framework. We find two competing chiroptical response types that contribute toward potential ambiguity in the interpretation of the circular dichroism spectra. The first, optical activity, originates from the interaction between hybridized eigenmodes, whereas the second manifests as a response superficially similar to optical activity but originating instead from differential near-field absorption modes. The study of the chiroptical response from nanoplasmonic devices presented here is expected to aid the development of next-generation chiroptical spectroscopy systems.

Original languageEnglish (US)
Pages (from-to)3656-3662
Number of pages7
JournalNano Letters
Volume20
Issue number5
DOIs
StatePublished - May 13 2020

Keywords

  • Chirality/optical activity
  • Metals
  • Molecular modeling
  • Uv-vis spectroscopy

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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  • Cite this

    Davis, M. S., Zhu, W., Strait, J., Lee, J. K., Lezec, H. J., Blair, S., & Agrawal, A. (2020). Chiroptical response of aluminum nanocrescents at ultraviolet wavelengths. Nano Letters, 20(5), 3656-3662. https://doi.org/10.1021/acs.nanolett.0c00586