Quantum plasmonics of finite-size particles with coherent anti-Stokes Raman scattering
Document Type
Article
Publication Date
1-1-2019
Abstract
We have developed a semianalytical theory to study a quantum plasmonic system composed of a quantum particle and a metallic particle with finite size. The quantum particle is composed of molecules driven by three laser fields and produces a coherent anti-Stokes Raman scattering (CARS) signal which is enhanced by plasmonic resonance of the metallic particle. The enhanced CARS field and the control laser form a Λ scheme that gives highly nonlinear and spatially nonlocal effects. We obtain absorption spectra that show periodic oscillations with radius of the spherical quantum particle, the whispering gallery effect. Plasmonic resonance gives very large and narrow absorption peaks as well as vanishing absorption or Fano dip at specific values of frequency and interparticle distance. The space between the two particles provides a resonant cavity effect which explains the oscillations of absorption power spectra with interparticle distance. © 2019 American Physical Society.
Keywords
Coherent anti Stokes Raman scattering, Finite-Size particles, Interparticle distances, Periodic oscillation, Plasmonic resonances, Resonant cavity effect, Semi-analytical theory, Whispering gallery
Divisions
PHYSICS
Funders
Ministry of Higher Education, Malaysia Grant No. FP30-2017A
Publication Title
Physical Review A
Volume
99
Issue
5
Publisher
American Physical Society