  The photonic hook, a beam that can propagate along a curved path, has
attracted wide attention since its inception and experimental confirmation. In
this paper, we propose a new type of structure, which was made by a hollow
microcylinder and a Janus-shaped liquid column of two insoluble filling
liquids, for producing photonic hook of easily tunable properties and long
length. The E^2 field intensity distribution characteristics and formation
mechanism of the photonic hook are studied by analyzing the energy flow using
the finite element method. The profile and properties of the photonic hook can
be effectively tuned by rotating the hollow microcylinder or changing the light
incident angle. A long photonic hook with a decay length of ~18{\lambda} and a
photonic hook with a large focal distance ~8{\lambda} are obtained by this
model.
