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We report trapping and propagation of photonic Dirac mode in a helicallytwisted hollow core photonic crystal fiber (HC-PCF) where the trapped light inthe hollow (air) defect can preserve the orbital angular momentum (OAM). Weshow that a photonic Dirac point can emerge even in a twisted system for asuitable choice of curvilinear coordinate and the related waveguide defectmodes defined in the new basis can preserve the associated OAM during axialtranslation. The effect of twist rate, defect geometry and crystal dimension onthe propagation of OAM carrying trapped Dirac modes is critically analyzed. Theresults derived by FEM simulation are verified with an analytical theory basedon dynamics of Bloch modes in twisted photonic crystals which are in goodagreement. The proposed HC-PCF can play an important role in exciting andguiding of OAM carrying modes that help particle trapping and quantumcommunication.

Orbital Angular Momentum preserving guided mode in helically twisted hollow core photonic crystal fiber at Dirac point