Surface-enhanced Raman scattering in metal microspheres

A. K. Sarychev, A. V. Ivanov, I. V. Bykov, M. S. Shestopalova, K. E. Mochalov

Institute for Theoretical and Applied Electrodynamics, Russian Academy of Sciences, 125412, Moscow, Russia
Institute of Laser and Plasma Technologies, National Research Nuclear University MEPhI, 115409, Moscow, Russia
Shemyakin‒Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 117997, Moscow, Russia

Abstract: We present an analytical theory of plasmons excited in spherical metal resonators filled with the molecules under study. A simple L‒C model of plasmons generated in a metal nanoshell is developed. The electromagnetic mechanism of surface-enhanced (giant) Raman scattering (SERS) can be investigated qualitatively and quantitatively. The theoretical results are in qualitative agreement with computer simulations. The results of the SERS experiment in polystyrene spheres coated with a silver nanolayer are presented.

Keywords: electric field enhancement, plasmon resonance, giant Raman scattering, metal microspheres, metal microspheres.

The work was supported by the Russian Science Foundation (grant no. 23-19-00788,https://rscf.ru/en/project/23-19-00788/).

Received: 20.10.2023