Focusing fractional-order cylindrical vector beams
| Autor: | V. D. Zaitsev, S. S. Stafeev |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Information theory Mathematical analysis Order (ring theory) richard-wolf formulas 02 engineering and technology QC350-467 Optics. Light 01 natural sciences Atomic and Molecular Physics and Optics Computer Science Applications sharp focusing 010309 optics 020210 optoelectronics & photonics energy backflow 0103 physical sciences 0202 electrical engineering electronic engineering information engineering cylindrical vector beam Electrical and Electronic Engineering Q350-390 |
| Zdroj: | Компьютерная оптика, Vol 45, Iss 2, Pp 172-178 (2021) |
| ISSN: | 2412-6179 0134-2452 |
| Popis: | By numerically simulating the sharp focusing of fractional-order vector beams (0≤m≤1, with azimuthal polarization at m=1 and linear polarization at m=0), it is shown that the shape of the intensity distribution in the focal spot changes from elliptical (m=0) to round (m=0.5) and ends up being annular (m=1). Meanwhile, the distribution pattern of the longitudinal component of the Poynting vector (energy flux) in the focal spot changes in a different way: from circular (m=0) to elliptical (m=0.5) and ends up being annular (m=1). The size of the focal spot at full width at half maximum of intensity for a first-order azimuthally polarized optical vortex (m=1) and numerical aperture NA=0.95 is found to be 0.46 of the incident wavelength, whereas the diameter of the on-axis energy flux for linearly polarized light (m=0) is 0.45 of the wavelength. Therefore, the answers to the questions: when the focal spot is round and when elliptical, or when the focal spot is minimal -- when focusing an azimuthally polarized vortex beam or a linearly polarized non-vortex beam, depend on whether we are considering the intensity at the focus or the energy flow. In another run of numerical simulation, we investigate the effect of the deviation of the beam order from m=2 (when an energy backflow is observed at the focal spot center). The reverse energy flow is shown to occur at the focal spot center until the beam order gets equal to m=1.55. |
| Databáze: | OpenAIRE |
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