Femtosecond Laser Induced Modifications in Optical Properties and Surface Morphology of Copper Boron Oxide Thin Films

摘要

We report on femtosecond (130 femto second) laser pulse removal and modification in Copper Boron Oxide thin films (CuBO2) deposited on silicon substrate. The samples were irradiated with 100 to 500 number of laser pulses at room temperature. Micro-size constructions on the surface of exposed CuBO2 thin films were produced and was observed using Scanning Electron Microscope (SEM). Self-prepared shapes like wrinkles, cellular erections, group of spots and cracks are observed by SEM studies. The small particles produced at initial laser pulses agglomerate into microspheres of Copper Boron Oxide. The optical properties show the high transmission value in (CuBO2) thin films when the number of laser pulses is increased. The optical band gap energy also decreases as compared to as deposited film up to 300 number of pulses and then increases up to 500 number of pulses. The results show that femtosecond laser irradiation considerably modifies the optical properties and surface morphology of (CuBO2) thin films.