Abstract
This paper investigates the effect of local nonlinearity on exceptional points-aided asymmetric modal dynamics using the framework of a dual-mode optical waveguide and reports on a non-chiral asymmetric mode conversion scheme, where depending on only the type of nonlinearities, the waveguide can deliver different dominating mode, irrespective of input and also the direction of light propagation.
Highlights
Non-Hermitian quantum mechanics, which can more accurately describe an open system, has garnered enormous attention in the field of quantum-inspired photonic systems
In the presence of a certain amount of nonlinearity above a particular threshold, light is converted to a specific dominating mode while propagating in a particular direction, where the same amount of focusing and defocusing nonlinearities results in different dominating outputs in the same direction, respectively
We observe a breakdown in adiabaticity in modal evolutions due to the dynamical variation of the control parameters (γ and τ ) around the exceptional points (EPs) [15,17,31,32] that results in a chirality-driven asymmetric mode conversion phenomenon, where regardless of the choice of inputs, light is converted in a specific mode depending the direction of propagation
Summary
Non-Hermitian quantum mechanics, which can more accurately describe an open system, has garnered enormous attention in the field of quantum-inspired photonic systems. Apart from the already reported dual-mode systems [15,16,17,34] with asymmetric mode conversion, the realization of different dominating modes at the same output port due to a single encirclement direction is more practical for integrated photonic devices from designing aspects and is yet to be explored. Asymmetric mode-converters without using the chiral aspect of the device
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