Activities and Findings Research and Education Activities: Twenty five papers have been published and two students were trained on Electron Beam Lithography which is important in making well defined nanoparticle assemblies. This is required to carry out our research on the effect of coupling between nanoparticles on their non-radiative and radiative properties. The programs needed for making different structures have been developed, including designs for discs, prisms, rods, and rings. STUDENTS got trained in conjugating gold nano-particle to biological systems. In addition, several students were trained in theoretical computations on plasmonic particles using the DDA method.From these computations, predictions regarding the inter-particle coupling has been calculated and new interesting results are being calculated.. A postdoctoral fellow , Dr Svetlana Neretina was trained in this area well and became an expert in this field of nano-technology and solar energy conversion.As a result,She was offered and accepted an Assistant professorship at the engineering department of Temple University.. This Last year I have accepted to sponsor a young lady who failed the Literature Exams and was asked to leave GT. I realized that she is very good in creative research. She retook the Exams and passed them and is doing excellent research.. 1.)) Photothermal reshaping of prismatic gold nanoparticles in periodic monolayer arrays by femtosecond laser pulses: Prismatic gold nanoparticles in the periodic monolayer arrays prepared with nanosphere lithography technique can be reshaped with femtosecond laser pulses at different powers and wavelengths. As the power density of the 400nm femtosecond laser pulse increases, the prismatic particle tips begin to round and the overall particle shape changes from a prism to a sphere with a tripodal intermediate. From the results of this work, it is shown that by changing the wavelength and power density of the femtosecond laser pulse, one can control the final shape of the particles formed from the original prismatic nanoparticles.. 2.)) The optically detected coherent lattice oscillations in silver and gold monolayer periodic nanoprism arrays: The Au nanoprisms formed by this method are found to have sharper tips than the corresponding Ag nanoprisms. For both Au and Ag nanoparticles, the surface plasmon absorption maximum is found to depend linearly on size. The coherent lattice oscillation periods are also found to follow the calculated dependence, the Au nanoparticle deviates from this model, and the deviation is found to increase with the size of the nanoparticles. This deviation can be explained by …