Highly curved reflective W-shape and J-shape photonic hook induced by light interaction with partially coated microfluidic channels

Photonic hook (PH) is a new type of artificial self-bending beam focused by a dielectric particle-lens with a curved waist smaller than the wavelength, which has the potential to revolutionize mesoscale photonics in many applications, e.g., optical trapping, signal switching, imaging, etc. In this paper, we discover a new mechanism that the highly curved PHs can be realised by the light interaction with the fully or partially metal-coated microchannels. The generated W-shaped and J-shaped PHs have bending angles exceeding 80-degree. Compared to other PH setups, the proposed design has a larger range to flexibly control the bending angle through the coating process and can be easily integrated with the established microfluidic systems. the back-folding, at ends of the were infinite length in the and on both z end surfaces of the 3D model (500nm thick along z-axis). The simulated results are in the field intensity of |𝐸| , which is obtained by squaring the magnitude of the