Enhancement of Raman scattering using silica microparticles

K. J. Yi, Y. F. Lu, H. Wang, Z. Y. Yang

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Currently, enhancement of Raman scattering for nanoscale characterization is mostly based on tip- or surface-enhanced methods. However, both approaches have some dilemmas which impede their wide applications. In this study, we investigated a novel approach to enhance Raman scattering using closely-packed micro and submicro silica spherical particles. The enhancement phenomena haven been demonstrated by the silicon phonon mode of crystalline silicon (c-Si) substrates as well as the vibration modes of single-walled carbon nanotubes (SWCNTs) covered with microparticles. The studies show that the enhancement effects strongly depend on the particle size. Specifically, when the particle size is close to the beam waist of the incident laser, the strongest enhancement occurs. Numerical simulations are performed to calculate electric field distribution inside and outside the dielectric particles using the Optiwave™ software which is based on the finite difference time domain (FDTD) algorithm under the perfectly matched layer (PML) boundary conditions. The simulated results reveal the existence of photonic nanojects in the vicinity outside the particles along with the light traveling direction. The nanojets outside of the particles with a length of 100 nm and a waist of 120 nm are believed to be the base for Raman scattering enhancement. This technique has potential applications in many areas such as surface science, biology, and microelectronics.

Original languageEnglish (US)
Title of host publicationLaser-based Micro- and Nanopackaging and Assembly
StatePublished - 2007
EventLaser-based Micro- and Nanopackaging and Assembly - San Jose, CA, United States
Duration: Jan 22 2007Jan 24 2007

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceLaser-based Micro- and Nanopackaging and Assembly
Country/TerritoryUnited States
CitySan Jose, CA


  • Electric field intensity
  • Microparticles
  • Nanojets
  • Raman scattering enhancement

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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