| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Orbital angular momentum density and spiral spectra of Lorentz-Gauss vortex beams passing through a single slit |
| Zhi-Yue Ji(季志跃), Guo-Quan Zhou(周国泉) |
| School of Sciences, Zhejiang A & F University, Lin'an 311300, China |
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Abstract Based on the Hermite-Gaussian expansion of the Lorentz distribution and the complex Gaussian expansion of the aperture function, an analytical expression of the Lorentz-Gauss vortex beam with one topological charge passing through a single slit is derived. By using the obtained analytical expressions, the properties of the Lorentz-Gauss vortex beam passing through a single slit are numerically demonstrated. According to the intensity distribution or the phase distribution of the Lorentz-Gauss vortex beam, one can judge whether the topological charge is positive or negative. The effects of the topological charge and three beam parameters on the orbital angular momentum density as well as the spiral spectra are systematically investigated respectively. The optimal choice for measuring the topological charge of the diffracted Lorentz-Gauss vortex beam is to make the single slit width wider than the waist of the Gaussian part.
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Received: 24 March 2017
Revised: 19 April 2017
Accepted manuscript online:
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PACS:
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42.25.Fx
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(Diffraction and scattering)
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42.50.Tx
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(Optical angular momentum and its quantum aspects)
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42.60.Jf
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(Beam characteristics: profile, intensity, and power; spatial pattern formation)
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42.79.Ag
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(Apertures, collimators)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11574272) and Zhejiang Provincial Natural Science Foundation of China (Grant No. LY16A040014). |
Corresponding Authors:
Guo-Quan Zhou
E-mail: zhouguoquan178@sohu.com
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Cite this article:
Zhi-Yue Ji(季志跃), Guo-Quan Zhou(周国泉) Orbital angular momentum density and spiral spectra of Lorentz-Gauss vortex beams passing through a single slit 2017 Chin. Phys. B 26 094202
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