کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1541035 996673 2008 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Displacements and deformations of a vortex light beam produced by the diffraction grating with embedded phase singularity
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Displacements and deformations of a vortex light beam produced by the diffraction grating with embedded phase singularity
چکیده انگلیسی

Properties of vortex light beams produced by a diffraction grating with groove bifurcation (“fork” structure) are studied in the case of small diffraction angles. Analytical expressions are derived for the amplitude distribution of a diffracted beam generated from an incident Gaussian beam with arbitrary radius and wavefront curvature, transversely shifted and inclined with respect to the nominal axis (normal to the grating crossing it at the bifurcation point). In such situations, the output beam becomes asymmetric; the optical vortex core and the intensity maximum displace orthogonally to the incident beam shift direction. The nearest vicinity of the vortex core preserves its circular symmetry and the optical vortex remains locally isotropic. The effects of misalignment depend on the incident beam characteristics, the diffraction order and the propagation distance behind the grating. Experimental measurements support the results of calculations.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optics Communications - Volume 281, Issue 14, 15 July 2008, Pages 3597–3610
نویسندگان
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