Abstract
The energy and spectral conditions for single-stage holographic recording of a diffraction optical element based on the carbazole-containing azo polymer, that forms singular light beams (optical vortices), have been established. With the atomic-force microscopy (AFM), the surface morphology of the recorded relief holograms was studying, and their diffraction efficiency has been estimated. The topology of the generated optical phase singularities has been studied and the stability range of an optical vortex having the topological charge l = 2 has been found. The possibility of using the developed diffractive optical element in the scheme of optical tweezers for manipulating micro-objects is demonstrated.
Highlights
For the last two decades singular light beams have attracted considerable interest of scientists and engineers
One of the techniques to form vortex light beams is the use of diffraction optical elements (DOEs) with a complex amplitude and phase profile
The light-sensitive azo polymer epoxypropyl carbazole (EPC):DO has been used as a polymeric medium in the process of work for vortex hologram recording
Summary
For the last two decades singular light beams (optical vortices) have attracted considerable interest of scientists and engineers. The studies embrace the generation methods of optical vortices [1,2,3,4,5,6,7,8,9,10] and their applications in different scientific and technological applications [11,12,13,14,15,16,17,18,19,20,21,22,23,24]. One of the techniques to form vortex light beams is the use of diffraction optical elements (DOEs) with a complex amplitude and (or) phase profile. DOEs may be produced as a result of solving the inverse diffraction problem (computer-generated holograms) [1,2,3] or by means of interference-holographic methods (analog recording of a holographic element) [2,3,4]. To transform the topological charge of a singular light beam, we can use recording of dynamic holograms [7,8,9], and the propagation of a Bessel beam in uniaxial crystals [10]
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