Figure 3
From: Spatially controlled nano-structuring of silicon with femtosecond vortex pulses
Separation of nanocones with unfolding singularity. Superposition of linearly polarized Gaussian and VV beams produced by a detuned q-plate, topological charge of \(q=-1\), with different relative weights of (a) 10:90, (b) 15:85, (c) 20:80 (d) 25:75. Top panels shows the SEM images of two nano-cones generated by a single laser pulse with an energy of 310 nJ. The bottom panels show the corresponding intensity profiles. Separation between the singularities increases with increase in the Gaussian component.
