Premium
Enhancement of Raman scattering by individual dielectric microspheres
Author(s) -
Du C. L.,
Kasim J.,
You Y. M.,
Shi D. N.,
Shen Z. X.
Publication year - 2011
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2684
Subject(s) - raman scattering , raman spectroscopy , dielectric , polystyrene , materials science , signal (programming language) , microsphere , numerical aperture , optics , scattering , aperture (computer memory) , analytical chemistry (journal) , nanotechnology , optoelectronics , chemistry , chemical engineering , composite material , acoustics , physics , chromatography , wavelength , computer science , programming language , engineering , polymer
Enhanced Raman scattering (ERS) from bulk Si and surface brilliant cresyl blue (Bcb) molecules was investigated by individual polystyrene (PS) microspheres placed on top of the samples. It is revealed that the Raman signal depends both on the microsphere size and the numerical aperture (NA) of the collection lens, and a maximum signal enhancement of ∼11‐ and 40‐fold for Si and Bcb is observed, respectively, showing strong ERS effect. The different ERS behavior was elucidated by electromagnetic simulations using the finite element method. The present work also provides information on individual dielectric sphere for applications in microscopy, spectroscopic imaging and improvement, etc. Copyright © 2010 John Wiley & Sons, Ltd.