title: Asymmetric wave propagation in planar chiral fibers.
abstract: We demonstrate the realization of a two-dimensional chiral optical waveguide with an infinite translational symmetry that exhibits asymmetric wave propagation. The low-symmetry geometry of the cross-section that lacks any rotational and mirror symmetries shows in-principal directional asymmetric polarization rotation. We use general symmetry arguments to provide qualitative analysis of the waveguide's eigenstates and numerically corroborate this using finite element simulation. We show that despite the only perturbative break of time-reversal symmetry via small modal losses, the structure supports a non-degenerate pair of co-rotating elliptical modes. We fabricated meters long fiber with a spiral structure and studied its optical properties.
authors: Research Laboratory of Electronics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02329-0407, USA.
authors: Dana
authors: D
authors: Shemuly
authors: Zachary M
authors: ZM
authors: Ruff
authors: Alexander M
authors: AM
authors: Stolyarov
authors: Grisha
authors: G
authors: Spektor
authors: Steven G
authors: SG
authors: Johnson
authors: Yoel
authors: Y
authors: Fink
authors: Ofer
authors: O
authors: Shapira
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation* / Q000379:methods*; D008027:Light; D008962:Models, Theoretical; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation