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The photonic hook, a beam that can propagate along a curved path, hasattracted wide attention since its inception and experimental confirmation. Inthis paper, we propose a new type of structure, which was made by a hollowmicrocylinder and a Janus-shaped liquid column of two insoluble fillingliquids, for producing photonic hook of easily tunable properties and longlength. The E^2 field intensity distribution characteristics and formationmechanism of the photonic hook are studied by analyzing the energy flow usingthe finite element method. The profile and properties of the photonic hook canbe effectively tuned by rotating the hollow microcylinder or changing the lightincident angle. A long photonic hook with a decay length of ~18{\lambda} and aphotonic hook with a large focal distance ~8{\lambda} are obtained by thismodel.

Easily tunable long photonic hook generated from Janus liquids-filled hollow microcylinder