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Photonic hook (PH) is a new type of artificial self-bending beam focused by adielectric particle-lens with a curved waist smaller than the wavelength, whichhas the potential to revolutionize mesoscale photonics in many applications,e.g., optical trapping, signal switching, imaging, etc. In this paper, wediscover a new mechanism that the highly curved PHs can be realised by thelight interaction with the fully or partially metal-coated microchannels. Thegenerated 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 flexiblycontrol the bending angle through the coating process and can be easilyintegrated with the established microfluidic systems.

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