Polarization-independent waveguiding with annular photonic crystals

Abstract

A linear waveguide in an annular photonic crystal composed of a square array of annular dielectric rods in air is demonstrated to guide transverse electric and transverse magnetic modes simultaneously. Overlapping of the guided bands in the full band gap of the photonic crystal is shown to be achieved through an appropriate set of geometric parameters. Results of Finite-Difference Time-Domain simulations to demonstrate polarization-independent waveguiding with low loss and wavelength-order confinement are presented. Transmission through a 90 degrees bend is also demonstrated.

High transmission through a 90° bend in a polarization-independent single-mode photonic crystal waveguide

“…However this approach results in multimode waveguides [12,13], with the extra modes having different group velocities.…”

High transmission through a 90° bend in a polarization-independent single-mode photonic crystal waveguide

“…High polarization-independent bend transmission has been demonstrated by a 3D structure consisting of two PhC slab waveguides with one waveguide stacked on top of the other [12], with each slab carrying a different polarization. Polarization-independent waveguiding and transmission through a 90 • bend have also been demonstrated in 2D, although guidance is multimode and bend losses are high [13]. Recently, single-mode polarization-independent waveguiding in 2D PhC slabs has been demonstrated, but without a calculation of bending loss [14].…”

An approach to achieve all-angle, polarization-insensitive and broad-band self-collimation in 2D square-lattice photonic crystals

“…at increasing the collimating efficiency [34], reducing reflection on the input PC surface [35,36], broadening the working frequency range [2,15,37], expanding the incident-angle range [2,11,23,37,38] and implementation of polarization-insensitive SC [14,22,[39][40][41][42], among many instances. The three latter aspects are extremely attractive from the viewpoint of applications in future photonic integrated systems.…”

“…These three characteristics can greatly enhance the efficiency of the SC and extend its applications [14]. Notice that most of the works reported so far support only one special polarization for the all-angle and broad-band SC, or the all-angle polarization insensitivity is limited to some frequency ranges only [2,11,14,15,22,23,[37][38][39][40][41][42][43][44]. To the best of our knowledge, there have been no reports on the all-angle, polarization-insensitive and, at the same time, relatively broad-band SC.…”