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Arrays of strongly-coupled atoms in a one-dimensional waveguide

Arrays of strongly-coupled atoms in a one-dimensional waveguide
Arrays of strongly-coupled atoms in a one-dimensional waveguide
We study the cooperative optical coupling between regularly spaced atoms in a one-dimensional waveguide using decompositions to subradiant and superradiant collective excitation eigenmodes, direct numerical solutions, and analytical transfer-matrix methods. We illustrate how the spectrum of transmitted light through the waveguide including the emergence of narrow Fano resonances can be understood by the resonance features of the eigenmodes. We describe a method based on superradiant and subradiant modes to engineer the optical response of the waveguide and to store light. The stopping of light is obtained by transferring an atomic excitation to a subradiant collective mode with the zero radiative resonance linewidth by controlling the level shift of an atom in the waveguide. Moreover, we obtain an exact analytic solution for the transmitted light through the waveguide for the case of a regular lattice of atoms and provide a simple description how the light transmission may present large resonance shifts when the lattice spacing is close, but not exactly equal, to half of the wavelength of the light. Experimental imperfections such as fluctuations of the positions of the atoms and loss of light from the waveguide are easily quantified in the numerical simulations, which produce the natural result that the optical response of the atomic array tends toward the response of a gas with random atomic positions.
1050-2947
Ruostekoski, Janne
2beb155e-64b0-4ee9-9cfe-079947a9c9f4
Javanainen, Juha
ae127878-c1cf-4e23-bebb-c3ec76b61081
Ruostekoski, Janne
2beb155e-64b0-4ee9-9cfe-079947a9c9f4
Javanainen, Juha
ae127878-c1cf-4e23-bebb-c3ec76b61081

Ruostekoski, Janne and Javanainen, Juha (2017) Arrays of strongly-coupled atoms in a one-dimensional waveguide. Physical Review A, 96 (9), [033857]. (doi:10.1103/PhysRevA.96.033857).

Record type: Article

Abstract

We study the cooperative optical coupling between regularly spaced atoms in a one-dimensional waveguide using decompositions to subradiant and superradiant collective excitation eigenmodes, direct numerical solutions, and analytical transfer-matrix methods. We illustrate how the spectrum of transmitted light through the waveguide including the emergence of narrow Fano resonances can be understood by the resonance features of the eigenmodes. We describe a method based on superradiant and subradiant modes to engineer the optical response of the waveguide and to store light. The stopping of light is obtained by transferring an atomic excitation to a subradiant collective mode with the zero radiative resonance linewidth by controlling the level shift of an atom in the waveguide. Moreover, we obtain an exact analytic solution for the transmitted light through the waveguide for the case of a regular lattice of atoms and provide a simple description how the light transmission may present large resonance shifts when the lattice spacing is close, but not exactly equal, to half of the wavelength of the light. Experimental imperfections such as fluctuations of the positions of the atoms and loss of light from the waveguide are easily quantified in the numerical simulations, which produce the natural result that the optical response of the atomic array tends toward the response of a gas with random atomic positions.

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Submitted date: 2017
Accepted/In Press date: 15 September 2017
e-pub ahead of print date: 29 September 2017

Identifiers

Local EPrints ID: 412990
URI: http://eprints.soton.ac.uk/id/eprint/412990
ISSN: 1050-2947
PURE UUID: b5c05e1c-7aed-434d-b9a8-552658495ae4

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Date deposited: 10 Aug 2017 16:30
Last modified: 26 Nov 2021 06:23

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Author: Juha Javanainen

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