title: Optical harmonic generation from periodically arrayed hexagonal structure of silver nanoparticles.
abstract: A self-assembled method was successfully exploited to fabricate a close-packed hexagonal structure of nano-silver clusters by deposition of silver films on polystyrene micro-spheres in conjunction with lift-off the micro spheres. An enhancement of the optical second-harmonic susceptibility was observed from these periodically arrayed silver particles with an intensity of several folds larger than that is generated from a uniform silver-film of the same thickness. The quasi-phase matching condition contributed from the Bragg wave vectors of the periodically arrayed silver nano-particles can satisfactorily express this enhancement.
authors.affiliation: Department of Electrical Engineering, National Tsing Hua University Hsin Chu 30042, Taiwan.
authors.forename: Chih-Chiang
authors.initials: CC
authors.lastname: Ho
authors.forename: Yi-Chen
authors.initials: YC
authors.lastname: Yeh
authors.forename: Juh Tzeng
authors.initials: JT
authors.lastname: Lue