Program

P.32 -- Poster, IWTCP-3

Date: Wednesday, 29 July 2015

Time: 08h30 - 10h00

Simple model for gold nano particles GNPs concentration dependence of Resonance Energy Transfer intensity

Nguyen Minh Hoa2, Chu Viet Ha3, Do Thi Nga1, Nguyen Tri Lan1, Tran Hong Nhung1, Nguyen Ai Viet1

1 Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Thu Le, Ba Dinh, Ha Noi, Vietnam 2 Hue University of Medicine and Pharmacy, Hue, Viet Nam 3 Thai Nguyen University of Education, Thai Nguyen, Vietnam

Gold nano particles GNPs concentration dependence of the energy transfer occurs between the fluorophores and GNPs is investigated. In the case of theses pairs, the gold nanoparticles can enhance or quench the fluorescence of fluorophores depending upon the relative magnitudes of two energy transfer mechanisms: i) the plasmonic field enhancement at the fluorophores emission frequencies (plasmon coupled fluorescence enhancement) and ii) the localized plasmon coupled Förster energy transfer from fluorescent particles to gold particles, which quenches the fluorescence. The competition of these mechanisms is depending on the spectral overlap of fluorophores and GNPs, their relative concentration, excitation wavelength. Simple two branches surface plasmon polariton model for gold nano particles GNPs concentration dependence of the energy transfer is proposed. We obtain quite good agreement of the theoretical results with experimental data.

Presenter: Nguyễn Minh Hoa