Spatial (phase-only) light modulators (SLMs) have successfully been used for different tasks in microscopy, one prominent example being the doughnut beam shaping in STED nanoscopy [1]. Once implemented into the laser beam path of a microscopic imaging system, its free programmability makes the SLM a versatile instrument for multiple uses. Aberration correction in such a retrofitted system, for ...

Abstract We investigated the beam profiles and polarization states in low-temperature photoluminescence from vertical GaAs/InGaAs/GaAs core-multishell nanowire (NW) under continuous-wave pulsed excitations. In profile excitation, a doughnut-shaped intensity distribution was confirmed. The shown to exhibit an axisymmetric polarization. These observations indicate that cylindrical vector beams we...

We have successfully generated vector beams with higher-order polarization states using photonic-crystal lasers. We have analyzed and designed lattice structures that provide cavity modes with different symmetries. Fabricated devices based on these lattice structures produced doughnut-shaped vector beams, with symmetries corresponding to the cavity modes. Our study enables the systematic analys...

Deflection of protons under axial channeling in a silicon crystal bent along the <111> axis was observed on experiment with 400-GeV protons at the CERN Super Proton Synchrotron. The deflection efficiency due to axial channeling of protons for the crystal with the bend angle 50 μrad was about 30 %. Axial channeling deflection occurred by means of doughnut scattering and hyper-channeling, this la...