The thresholds of surface nano-/micro-morphology modifications with femtosecond laser pulse irradiations
Cong Wang1, Haibin Huo, Michael Johnson
1Department of Physics and Applied Physics, and Nanomanufacturing Center, University of Massachusetts Lowell, One University Avenue, Lowell, MA 01854, USA.
Nanotechnology
|January 22, 2010
Abstract:
We studied the pulse energy threshold of surface nano-/micro-morphology modifications by irradiating Si, GaAs, GaP, InP, Cu and Ti surfaces with 100 fs laser pulses at a wavelength of 800 nm in air and in water. We found that the laser pulse energy thresholds required for the permanent modification in water are up to 30% lower than those in air. Different non-equilibrium dynamics processes of the surface melting layer cause the different thresholds in water and in air.
