Slow light with electromagnetically induced transparency in cylindrical waveguide

TL;DR

This paper investigates slow light via electromagnetically induced transparency in cylindrical waveguides with three-level atoms, analyzing mode propagation and controllability for potential optical memory and delay applications.

Contribution

It introduces a method to analyze EIT-induced slow light in cylindrical waveguides, including permittivity profile calculation and mode propagation using finite difference methods.

Findings

Transparency window can be controlled via waveguide parameters

Reduced group velocity enables optical buffering applications

Mode shape and propagation constants are precisely calculated

Abstract

Slow light with electromagnetically induced transparency (EIT) in the core of cylindrical waveguide (CW) for an optical fiber system containing three-level atoms is investigated. The CW modes are treated in the weakly guiding approximation which renders the analysis into manageable form. The transparency window and permittivity profile of the waveguide due to the strong pump field in the EIT scheme is calculated. For a specific permittivity profile of the waveguide due to EIT, the propagation constant of the weak signal field and spatial shape of fundamental guided mode are calculated by solving the vector wave equation using the finite difference method. It is found that the transparency window and slow light field can be controlled via the CW parameters. The reduced group velocity of slow light in this configuration is useful for many technological applications such as optical memories, effective control of single photon fields, optical buffer and delay line.