Inverse design of nanoparticles for enhanced Raman scattering

Rasmus E. Christiansen, Jérôme Michon, Mohammed Benzaouia, Ole Sigmund, Steven G. Johnson

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Abstract

We show that topology optimization (TO) of metallic resonators can lead to x223C;102x2009;x00D7; improvement in surface-enhanced Raman scattering (SERS) efficiency compared to traditional resonant structures such as bowtie antennas. TO inverse design leads to surprising structures very different from conventional designs, which simultaneously optimize focusing of the incident wave and emission from the Raman dipole. We consider isolated metallic particles as well as more complicated configurations such as periodic surfaces or resonators coupled to dielectric waveguides, and the benefits of TO are even greater in the latter case. Our results are motivated by recent rigorous upper bounds to Raman scattering enhancement, and shed light on the extent to which these bounds are achievable.
Original languageEnglish
JournalOptics Express
Volume28
Issue number4
Pages (from-to)4444-4462
ISSN1094-4087
DOIs
Publication statusPublished - 2020

Keywords

  • Electromagnetic radiation
  • Purcell effect
  • Raman scattering
  • Raman spectroscopy
  • Spontaneous emission
  • Surface enhanced Raman spectroscopy

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