Synthesis and analysis of optical vortices with fractional topological charges

Phase contrast enhancement in microscopy using spiral phase filtering

“…For the application in filtering, the Fourier spectrum of the SPP, especially the position of the vortex core, plays a very important role. It has been shown that the vortex core is not located on the optical axis, but lies in a radial line laterally orthogonal to the starting angle of the spiral phase [7,16]. Therefore it is expected to find the orientation of enhancement along this radial line, which is also suggested by the experimental results (see Fig.…”

“…The fractional SPP is not just a simple generalization of the SPP of integer topological charge. It has a significant influence on the formation, structure and property of the vortex generated, both from quantum and classical optics point of view [11][12][13][14][15][16]. For the application in filtering, the Fourier spectrum of the SPP, especially the position of the vortex core, plays a very important role.…”

Breathing Azimuthons in Nonlocal Nonlinear Media

“…4 (colour online). Initial intensity distribution of an azimuthon (top) and dynamics of it (bottom) with E 0 < E c , E 0 > E c , E 0 = E c from left to right at the same propagation distance z = 10. cussed theoretically [35,36] and demonstrated experimentally [37 -39]. Figure 2 displays the comparison between the numerical nonlinear term (2) and the corresponding nearest one.…”

Optical vortex generation by volume holographic elements with embedded phase singularity: Effects of misalignments

“…Their properties have been studied in many experimental and theoretical works [17,24,[25][26][27][28][29][30][31][32][33][34][35][36], though practically all of the results are limited to the case of a thin (plane) HE (in this case the generated OV-beams can be united within a special class of 'Kummer beams' [30], or 'hypergeometric-Gaussian beams' [34]). However, operation of such thin HEs is not free from essential drawbacks: simultaneous diffraction to a number of orders leads to low intensities of any of the individual diffracted beams, each diffracted OV-beam is rather sensitive to uncontrollable conditions of HE-induced transformations, and the whole OV-generation procedure suffers from low angular and spectral selectivities.…”