Nonreciprocal Propagation of Nematicons

Author:

Calisto Enrique1ORCID,Assanto Gaetano2ORCID

Affiliation:

1. School of Mathematics, University of Edinburgh, Edinburgh EH9 3FD, UK

2. NooEL—Nonlinear Optics and OptoElectronics Lab, DIIEM-University “Roma Tre”, 00146 Rome, Italy

Abstract

We model two-port nonlinear optical isolators based on solitary waveguides in planar cells with non-homogeneously oriented liquid crystals in the nematic phase. In a planar layout with molecular anchoring linearly changing along the sample length or across its width, we conduct numerical experiments on the excitation and propagation of reorientational solitons—“nematicons”—launched in opposite directions from the two ends of the cell. Specifically, in the Kerr-like diffractionless regime corresponding to graded-index waveguides for copolarized weak signals, we investigate the non-overlapping trajectories of forward and backward propagating wavepackets. The resulting non-specular transmission entails optical isolation and diode-like behavior as light propagating backwards does not reach the forward input. The response dependencies on input power, range of angular modulation, and one-photon losses are analyzed with reference to parameters of realistic soft matter.

Funder

Air Force Office of Scientific Research

Chilean Agencia Nacional de Investigacion Y Desarrollo through Beca Doctorado Extranjero 2020

Publisher

MDPI AG

Subject

Radiology, Nuclear Medicine and imaging,Instrumentation,Atomic and Molecular Physics, and Optics

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