部分Bessel形电磁波

摘要

We present the spatially self-bending solutions (the partial Bessel functions) of the Maxwell equations, where the self-bending wave can be produced through launching a group of plane waves that interfere with each other by modulating their initial phases and the emission directions. The self-bending electromagnetic waves accelerating in a circular trajectory preserve the beam shape within a certain propagation distance. Unlike Ariy wave packet, the bending angle of the new self-accelerating wave can be much larger than that of Ariy beam. The Poynting vector of the half Bessel beam shows that the main lobe maintains a propagation-invariant structure and can complete a turn close to 180◦. In addition, one pair of half Bessel electromagnetic waves is forbidden to propagate inside a certain area where the designed beam generates the self-shielding region.%　　给出了满足Maxwell方程的自弯曲电磁波解(部分Bessel函数)，其可以通过发射调制初始相位和发射方向的一组平面波干涉合成来实现。自弯曲电磁波在一定传播距离内保持波束形状不变，其传播轨道接近圆形。这类曲线加速的电磁波不同于Ariy波束，其中部分Bessel波束的弯曲角度可以远大于Ariy波。半Bessel波束的Poynting矢量表明主瓣能够保持能量不扩散且偏转接近180◦。此外，同时发射一对半Bessel电磁波能够在一定区域内实现对消，即在该域内实现电磁波自屏蔽。