传播和倏逝矢量贝塞尔光束的光学坡印亭奇点
Optical Poynting singularities of propagating and evanescent vector Bessel beams
摘要：
对于传播和消逝矢量贝塞尔光束，我们研究了能流密度为零的坡印廷矢量奇点（坡印廷奇点）。坡印廷奇异性包括所有的相位奇异性和一些偏振奇异性（L点和C点）。我们揭示的存在条件和位置的奇点，这是位于圆柱表面上的光束轴。我们将倏逝贝塞尔光束的特殊情况标记为柱面驻波形式，即在任意空间点处都是奇异的。
英文摘要：
For propagating and evanescent vector Bessel beams, we study the singularities of the Poynting vector (Poynting singularities), at which the energy flux density turns to zero. Poynting singularities include all the phase singularities and some of polarization ones (L- and C-points). We reveal the existence conditions and positions of singularities, which are located at cylindrical surfaces around the beam axis. We mark the special case of the evanescent Bessel beam in the form of cylindrical standing wave, that is singular at any spatial point.
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