Chapter 5 Singular Optics: Optical Vortices and Polarization Singularities

旋涡 物理 坡印亭病媒 涡流 引力奇点 标量(数学) 极化(电化学) 光学 奇点 角动量 光束 物理光学 经典力学 量子力学 几何学 化学 数学 物理化学 磁场 热力学
作者
Mark R. Dennis,Kevin O’Holleran,Miles J. Padgett
出处
期刊:Progress in Optics [Elsevier BV]
卷期号:: 293-363 被引量:702
标识
DOI:10.1016/s0079-6638(08)00205-9
摘要

The widespread availability of spatially and temporally coherent laser sources makes the production of optical vortices inevitable in any experiment involving scattered laser light. The realization of quantized vortices is not specific to optics: these objects occur in all spatial scalar fields. Although optical vortices are often referred to as “points of phase singularity within a cross section of the field,” physical optical fields extend over three dimensions, and the phase singularities are actually lines of perfect destructive interference that are embedded in the volume filled by the light. Optical vortices are examples of the singularity lines within all complicated scalar fields. By comparison, electromagnetic vector fields do not generally have nodes in all components simultaneously. However, vector fields possess singularities associated with the parameterization of elliptical and partial polarization rather than phase. Polarization singularities are present in many situations, ranging from sunlight to the light transmitted by birefringent materials. Their descriptors are more complicated than their scalar counterpart in that they have both handedness and additional categorization. The study of optical vortices and orbital angular momentum has led to a recognition that the energy flow—characterized by the Poynting vector—has features not immediately apparent from the intensity alone, nor from global properties of a beam.
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