Kuk Ki Kim

Laser ablation dynamics in liquid phase: The effects of magnetic field and electrolyte

We examined the laser ablation dynamics of silver target in aqueous phase to explore the effects of laser power, ambient electrolytes, and magnetic field on the formation and expansion of laser-induced plasma plume, bubbles, and nanoparticles. The lifetime of the plasma emission increased with magnetic field and electrolytes, while they had no influence on the conversion of laser energy to the energy of laser-induced bubbles formed thereafter. The size of the bubbles was dependent only on the laser power.

Characterization of SnO 2 thin films grown by pulsed laser deposition under transverse magnetic field

ABSTRACT : SnO 2 thin films were deposited on fused silica substrate by pulsed laser deposition under transverse magnetic field. We have explored the effects of magnetic field and ablation laser wavelength on the optical properties of laser-induced plasma plume and structural characteristics of the deposited SnO 2 films. Optical emission from the plume was monitored using an optical fiber to examine the influence of magnetic field on the population of the excited neutral and ionic species and their decay with times after laser ablation. Also, we employed photoluminescence, x-ray diffraction, and UV-Vis absorption to characterize SnO 2 films. SnO 2 is n-type semiconducting material with a wide bandgap of 3.6 eV at room temperature. Since SnO 2 has high transparency in visible region and electric conductivity, it has diverse applications in gas sensors, solar cells, transparent conducting electrodes, and optoelectronic devices