This work introduces the concept of 3D-nanoprinted, on-chip twisted hollow-core light cages, which are novel integrated chiral waveguides. To analyze their optical properties and the origin of their strong circular dichroism, the modes of the infinitely extended twisted waveguide were calculated using the finite element method (FEM) in the helicoidal coordinate frame. These simulations were performed with JCMsuite, which natively supports calculations in helicoidal coordinates, allowing the authors to investigate twist-induced resonances and angular momentum coupling based on the waveguide's 2D cross-section.
J. Bürger, et al. On-chip twisted hollow-core light cages: enhancing planar photonics with 3D nanoprinting. Adv. Photonics, 7, 046002 (2025).