title: Surface plasmon enhancement of two- and three-photon absorption of Hoechst 33 258 dye in activated gold colloid solution.
abstract: Herein we present experimental evidence of the strong surface plasmon enhancement of two- and three-photon absorption of Hoechst 33 258 (2'-(4-hydrophenyl)-5-(4-methyl-1-piperazinyl)-2,5'-bis(1H-benzimidazole)) pentahydrate in an aqueous solution containing activated gold colloid. The 480-fold enhancement in two-photon absorption and 30-fold in three-photon absorption are predominantly attributed to the electric-field enhancement via surface plasmon resonance. The greater enhancement observed in two-photon absorption is due to the characteristic two- and three-photon absorption cross-sections of the dye.
authors.affiliation: Department of Chemistry and School of Optics/CREOL/FPCE, University of Central Florida, P.O. Box 162366, Orlando, Florida 32816-2366, USA.
authors.forename: Ion
authors.initials: I
authors.lastname: Cohanoschi
authors.forename: Florencio E
authors.initials: FE
authors.lastname: Hernández