Dear Sir. Concerning your issue about the characterization of Silicon nanoparticles by Raman Spectroscopy. Light induced Mie resonances of high refractive index particles generate strong evanescent electromagnetic (EM) fields, thus boosting the Raman signal of species attached to the nanoparticles. The interest of this process is justified by the wide range of experimental configurations that can be implemented including photonic crystals, the sharp spectral resonances easily tuneable with the particle size, the biocompatibility and biodegradability of silicon, and the possibility of direct analysis of molecules that do not contain functional groups with high affinity for gold and silver. Additionally, silicon nanoparticles present stronger field enhancement due to Mie resonances at larger sizes than gold. I think the following below links may help you in your analysis:

http://pubs.rsc.org/en/content/articlelanding/2014/nr/c4nr00593g#!divAbstract

https://www.researchgate.net/publication/256772542_Raman_and_IR_investigation_of_silica_nanoparticles_structure

https://www.epjap.org/articles/epjap/abs/2008/10/ap08138/ap08138.html

https://web.njit.edu/~sirenko/Publications/ssc2000.pdf

Thanks

Dear Anirudh Pai, i recommend you to read this article

http://pubs.rsc.org/en/content/articlelanding/2014/nr/c5nr07965a#!divAbstract

Dear Anirudh Pai

every materials can be characterized by Raman spectrum because every material have its finger print (its own spectrum)

this is very interesting research on your topics

https://www.researchgate.net/.../230074431_Micro_Raman_Spectroscopy_of_Silica_...