Whispering gallery modes and effect of coating on Raman spectra of single microspheres
Article first published online: 23 FEB 2011
Copyright © 2011 John Wiley & Sons, Ltd.
Journal of Raman Spectroscopy
Volume 42, Issue 6, pages 1373–1378, June 2011
How to Cite
Dantham, V. R., Bisht, P. B. and Dobal, P. S. (2011), Whispering gallery modes and effect of coating on Raman spectra of single microspheres. J. Raman Spectrosc., 42: 1373–1378. doi: 10.1002/jrs.2868
- Issue published online: 17 JUN 2011
- Article first published online: 23 FEB 2011
- Manuscript Accepted: 8 NOV 2010
- Manuscript Received: 3 MAY 2010
- Department of Science and Technology (DST), New Delhi. Grant Number: SR/S2/LOP-0014/2009
- whispering gallery modes;
- Raman scattering;
Raman spectra and fluorescence of BaTiO3 and silica microspheres of different sizes have been studied. The observed whispering gallery modes (WGMs) have been assigned using theoretical simulations based on the Lorenz–Mie theory. The WGMs are found to have selective enhancements in the Raman spectra. The variations in the Raman spectra with the radial position of the excitation spot and excitation wavelength have been correlated with the morphology-dependent internal field distributions of the microspheres. The effect of a thin dye coating on the fluorescence and Raman spectra was studied, and a coating thickness of ∼200 nm was estimated from the theoretical simulation of experimentally observed data based on the Aden and Kerker theory. Copyright © 2011 John Wiley & Sons, Ltd.