It is well known that electromagnetic radiation propagates along a straight line, but this common sense was broken by the artificial curved light—the Airy beam. In this Letter, we demonstrate a new type of curved light beam besides the Airy beam, the so-called “photonic hook.” This photonic hook is a curved high-intensity focus by a dielectric trapezoid particle illuminated by a plane wave. The difference between the phase velocity and the interference of the waves inside the particle causes the phenomenon of focus bending.

中文翻译：

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光子钩：新的弯曲光束

众所周知，电磁辐射沿直线传播，但是这种常识被人造弯曲的光（艾里光束）所破坏。在这封信中，我们演示了除艾里光束之外的一种新型弯曲光束，即所谓的“光子钩”。该光子钩是平面波照射的电介质梯形粒子，是弯曲的高强度焦点。相速度与粒子内部波的干涉之间的差异会导致聚焦弯曲现象。