Non-adiabatic Modal Dynamics around Exceptional Points in an All-Lossy Dual-Mode Optical Waveguide: Towards Chirality Driven Asymmetric Mode-Conversion

Abstract

We report a 1D planar optical waveguide with transverse distribution of inhomogeneous loss profile, which exhibits an exceptional point (EP). The waveguide hosts two leaky resonant modes; where the interaction between them in the vicinity of the EP is controlled by proper adjustment of the inhomogeneity in attenuation profile only. We study the adiabatic dynamics of propagation constants of the coupled modes by quasi-static encirclement of control parameters around the EP. Realizing such an encirclement with the inhomogeneous loss distribution along the direction of light propagation, we report the breakdown of adiabatic evolution of two coupled modes through the waveguide in presence of an EP. Here, during conversion the output mode is irrespective of the choice of input excited mode but depends on the direction of light transportation. This topologically controlled, robust scheme of asymmetric mode conversion in the platform of the proposed all-lossy waveguide structure may open up an extensive way-out for implementation of state-transfer applications in chirality driven waveguide-based devices.

15 pages, 7 figures

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Cited by in corpus (8)

• Parity-Time Symmetry in Non-Hermitian Complex Optical Media
• Third-order Exceptional Point and Successive Switching among Three States in a Degenerate Optical Microcavity
• Nonlinearity Induced Anomalous Mode Collapsing and Non-chiral Asymmetric Mode Switching around multiple Exceptional Points
• Higher order topological degeneracies and towards unique successive state-switching in a four-level open system
• Formation of Exceptional Points in pseudo-Hermitian Systems
• Nonadiabatic Modal Dynamics Around a Third-order Exceptional Point in a planar waveguide
• Correlated Nonreciprocity around Conjugate Exceptional Points
• Dynamic manifestation of exception points in a non-Hermitian continuous model with an imaginary periodic potential