Recent theoretical and experimental work on helically twisted photonic crystal fibres (PCFs)
is reviewed. Helical Bloch theory is introduced, including a new formalism based on the tight …

We address the formation of topological states in twisted circular waveguide arrays and find
that twisting leads to important differences of the fundamental properties of new vortex …

Orbital angular momentum (OAM) of light beams with helical phase front, as an alternative
spatial dimension resource of photons, has attracted extensive attention over the past …

A century ago, Einstein proposed that gravitational forces were the result of the curvature of
space-time and predicted that light rays would deflect when passing a massive celestial …

An air-core fiber imposed by torsion is investigated in this paper. We refer to this kind of fiber
as twisted air-core fiber (TAF). It has been demonstrated that the eigenstates of the TAF …

We study the propagation of optical vortices in a system which consists of a tandem of a
multi-helical and twisted anisotropic fiber. We show that at certain resonance regimes of the …

The orbital angular momentum (OAM) intrinsically carried by vortex beams provides
additional degrees of freedom for communication and manipulation in both classical and …

In this study, an all-fiber±3-order orbital angular momentum (OAM) mode generator with∼
90% conversion efficiency is proposed and experimentally demonstrated. By using a helical …

Generalized perfect optical vortices (GPOVs) with controllable shapes have attracted much
attention recently due to their distinctive features and potentials towards broad range of …

Robust higher-order optical vortices for information transmission in twisted anisotropic optical
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