التفاصيل البيبلوغرافية
| العنوان: |
Polarisation singularities of non-paraxial Gaussian vortex beams diffracted by an annular aperture. |
| المؤلفون: |
Liu, Yongxin1, Pu, Jixiong2, Lu, Baida3 |
| المصدر: |
Journal of Modern Optics. May2011, Vol. 58 Issue 8, p657-664. 8p. 5 Graphs. |
| مصطلحات موضوعية: |
RADIO wave propagation, OPTICAL diffraction, RAYLEIGH model, GAUSSIAN processes, MATHEMATICAL singularities, ANNIHILATION reactions, OPTICAL polarization |
| مستخلص: |
Based on the vectorial Rayleigh-Sommerfeld diffraction integrals, the propagation expressions for non-paraxial Gaussian vortex beams diffracted by an annular aperture are derived, and are used to analyse polarisation singularities of non-paraxial Gaussian vortex beams in the diffraction field. It is shown that there exist polarisation singularities including C-points (S12 vortices), S23 vortices, and S31 vortices. The number and position of polarisation singularities depend on the waist width of the beam, the off-axis distance of the vortex and the aperture parameter. The creation and annihilation of polarisation singularities appear as a controlling parameter - including the waist width, off-axis distance and aperture parameter - varies. When compared with the free-space propagation, more polarisation singularities may take place in the diffraction field. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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