2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Active glass nanoparticles by ultrafast laser pulses

K. Hiromatsu, D.J. Hwang and C.P. Grigoropoulos
Asahi Glass Co., Ltd., JP

Keywords:
nanoparticle generation, ultrafast laser, active glass

Abstract:
We have successfully demonstrated a new method employing pulsed-laser ablation of active glass substrate to produce nanoparticles exhibiting upconversion. High repetition rate ultra short pulsed-laser radiation was used to ablate glass substrates under normal atmospheric conditions. Ejected particles collected on silicon and glass substrates were analyzed by Transmission Electron Microscope (TEM) and Scanning Electron Microscope (SEM) to determine particle size and characterize the morphology. The measured mean particle diameter was approximately 17nm, while the particles formed one or two dimensional chain structures. Bright upconversion green emission was observed from the nanoparticles. The upconversion photoluminescence characteristics have been investigated to explore potential applications to highly efficient bio imaging and light emitting devices.

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