Abstract
We demonstrate a radiation hydrodynamic simulation of optical vortex pulse-ablated microcone structures on silicon (Si) substrates. Doughnut-shaped craters were formed by single pulse irradiation on the Si substrate, and a twisted cone structure with a height of 3.5 µm was created at the center of the irradiation spot by the circularly polarized optical vortex pulse. A two-dimensional (2-D) radiation hydrodynamic simulation reproduced the cone structure well with a height of 3 µm. The central part of the incident laser power was lowered from the initial profile due to plasma shielding over the laser pulse duration for an inverted double-well laser profile. The acute tip shape of the silicon surface can survive over the laser irradiation period.
Highlights
We have described the ablated structures on Si substrates irradiated by polarization-determined optical vortex laser pulses and using the radiation hydrodynamic simulation
Optical vortex beams are expected to be employed as a well-controlled fabrication technique of microparticles
Summary
We determined the polarization states of the converted optical vortex nanosecond pulse. A laser is employed as a light source. After passing through a polarizer and two lenses, the laser beam with horizontal linear polarization is incident on the vortex beam generator. The vortex beam generator consists of a linear polarizer and a vortex phase plate (RPC Photonics, VPP-m1064), which is fabricated by gray scale lithography. A Gaussian beam with a uniform phase is converted into a Laguerre-Gaussian beam, like a doughnut-shaped beam.
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