We have reported that laser-induced metal particle migration in glass. Laser illumination heated a metal particle in glass. The surrounding glass of the metal particle was also heated and softened; hence, the metal particle migrated in the glass. The temperature gradient caused the driving force. The interfacial tension between the glass and the metal particle was varied by the temperature. The temperature nonuniformity caused the interfacial tension nonuniformity and metal particle migration. In this presentation, we demonstrated metal particle migration by the surface heating of the glass with a CO2 laser. Heating of glass surface moved metal particle located 200 μm below the surface. The particle was moved out of the glass after 400 s illumination. The migration speed was 0.3~0.7 μm/s.
We proposed a technique to manipulate a metal particle in glass optically. The glass in the neighborhood of the laserheated
metal particle softened; hence, the metal particle migrated in the glass. In our numerical calculation, the
temperature difference in the metal particle generated the inhomogeneous distribution of the interfacial tension between
melted metal particle and softened glass. The inhomogeneous distribution generated driving force. In this presentation,
the experimental temperature measurement by using emitted light of the migrating metal particle in glass was discussed.
The temperature was approximately 2400 K and corresponded with the numerical calculated temperature reported before.
In this study, a statistical analysis was carried out about influences of energy variance, pre-pulse and post-pulse setting to the main pulse on the melt zone. In the experiment, laser beams were irradiated on the plates of aluminum alloy by two spots, and then, depth and width of melt were measured. Thus, the fluctuation in the dimensions measured was analyzed using statistical methods.