Patterned Nanofoam Fabrication from a Variety of Materials via Femtosecond Laser Pulses

Abstract

High-repetition-rate femtosecond lasers enable the precise production of nanofoam from a wide range of materials. Here, the laser-based fabrication of nanofoam from silicon, borosilicate glass, soda-lime glass, gallium lanthanum sulphide and lithium niobate is demonstrated, where the pore size of the nanofoam is shown to depend strongly on the material used, such that the pore width and nanofibre width appear to increase with density and thermal expansion coefficient of the material. In addition, the patterning of nanofoam on a glass slide, with fabricated pattern pixel resolution of ~35 µm, is demonstrated.

Numerical Simulation for the Efficiency of the Produced Terahertz Radiation by Two Femtosecond Laser Pulses: Above-Threshold-Ionization

“…Because of its non-destructive and non-contact properties, and label-free optical method, the terahertz radiation has a growing attention in security inspection [1], biological imaging and spectroscopy [2], biomedicine [3], THz communication [4] [5], and industry [6] [7]. In air plasma, the filamentaion of two-color femtosecond (fs) laser beams is the fundamental mechanism of the terahertz radiation production.…”