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Photonic hook is a high-intensity bent light focus with a proportionalcurvature to the wavelength of the incident light. Based on this uniquelight-bending phenomenon, a novel near-field photonic switch by means of aright-trapezoid dielectric Janus particle-lens embedded in the core of a planarwaveguide is proposed for switching the photonic signals at two common opticalcommunication wavelengths 1310 nm and 1550 nm by using numerical simulations.The signals at these two wavelengths can be guided to different routesaccording to their oppositely bent photonic hooks to realise wavelengthselective switching. The switching mechanism is analysed by an in-housedeveloped three-dimensional (3D) Poynting vector visualisation technology. Itdemonstrates that the 3D distribution and number of Poynting vector vortexesproduced by the particle highly affect the shapes and bending directions of thephotonic hooks causing the near-field switching, and multiple independenthigh-magnitude areas matched by the regional Poynting vector streamlines canform these photonic hooks. The corresponding mechanism can only be representedby 3D Poynting vector distributions and is being reported for the first time.

Near-field light-bending photonic switch: physics of switching based on three-dimensional Poynting vector analysis