Molecular chirality detection using plasmonic and dielectric nanoparticles

Taehyung Kim, Q. Han Park

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Nanoscale particles and structures hold promise in circular dichroism (CD) spectroscopy for overcoming the weakness of molecular CD signals. Significant effort have been made to characterize nanophotonic CD enhancement and find efficient ways to boost molecular chirality, but the best solution is yet to be found. In this paper, we present a rigorous analytic study of the nanophotonic CD enhancement of typical nanoparticles. We consider metallic and dielectric nanoparticles capped with chiral molecules and analyze the effect of multipolar nanoparticles on the molecular CD. We identify the spectral features of the molecular CD resulting from the electric and magnetic resonances of nanoparticles and suggest better ways to boost molecular chirality. We also clarify the contribution of particle scattering and absorption to the molecular CD and the dependence on particle size. Our work provides an exact analytic approach to nanophotonic CD enhancement and offers a rule for selecting the most efficient particle for sensitive molecular chirality detection.

Original languageEnglish
Pages (from-to)1897-1904
Number of pages8
JournalNanophotonics
Volume11
Issue number9
DOIs
Publication statusPublished - 2022 Apr 1

Keywords

  • chiral molecules
  • chiral sensing
  • chiroptical spectroscopy
  • circular dichroism (CD)
  • dielectric nanoparticles
  • plasmonic nanoparticles

ASJC Scopus subject areas

  • Biotechnology
  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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