Nanoplasmonics and Surface Enhanced Spectroscopy

Why plasmon enhancement coefficient is different for light absorption, scattering and luminescence effects?
L. Dolgov1, V. Kiisk1, I. Sildos1, O. Fesenko2, M. Dramicanin3, M. Wu4
1Institute of Physics, University of Tartu, W. Ostwaldi Street 1, Tartu 50411, Estonia, email: leonid.dolgov@ut.ee
2Institute of Physics, NAS of the Ukraine, Prospect Nauki 46, Kyiv 03680, Ukraine
3Vinca Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, Belgrade 11001, Serbia
4MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, P. R. China

Minute addition of metal nanoparticles or metal nanolayers to dielectric material can drastically change its optical properties. Light induced collective electron plasma oscillations localized near metal-dielectric interface can sufficiently enhance intensity of light absorption, scattering and luminescence in such materials at resonance frequencies. For example, pronounced several order plasmonic increase in intensity of Raman light scattering for material, contacting with noble metal nanoparticles [1], give hope on the same manner promising effects in light absorption (plasmonic solar cells [2]) and light emission (nano-lasers and SPASERs [3]). However, values of light intensity enhancement reported for these effects are different in different literature sources. This report both inspects selected publications related to plasmonic enhancement of light absorption, scattering and luminescence and discusses original results obtained by corresponding author in partnership with several scientific groups from Ukraine, Serbia, China and Estonia.
Acknowledgement I acknowledge Ukrainian Armed Forces, ZSU, for saving Ukraine and staying on guard of European values, Estonian nation and all EU for strong former and present support of Ukraine.    

1.	Weitz D., Garoff S., Gersten J., Nitzan A. The Enhancement of Raman Scattering, Resonance Raman Scattering, and fluorescence from Molecules Adsorbed on a Rough Silver Surface // J. Chem. Phys.-1983.- 78.- 5324-5338.
2.	Polman A., Atwater H. Photonic design principles for ultrahigh-efficiency photovoltaics // Nat. Mater. -2012.- 11. - 174-177.
3.	 Stockman M. Spasers explained // Nat. Photonics. - 2008.-2.- 327-329.