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Attenuation Coefficient of Single-Mode Periodic Waveguides

Baron, A; Mazoyer, S; Smigaj, W; Lalanne, P; (2011) Attenuation Coefficient of Single-Mode Periodic Waveguides. PHYS REV LETT , 107 (15) , Article 153901. 10.1103/PhysRevLett.107.153901. Green open access

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Abstract

It is widely accepted that, on ensemble average, the transmission T of guided modes decays exponentially with the waveguide length L due to small imperfections, leading to the important figure of merit defined as the attenuation-rate coefficient alpha = -< ln(T)>/L. In this Letter, we evidence that the exponential-damping law is not valid in general for periodic monomode waveguides, especially as the group velocity decreases. This result, that contradicts common beliefs and experimental practices aiming at measuring alpha, is supported by a theoretical study of light transport in the limit of very small imperfections, and by numerical results obtained for two waveguide geometries that offer contrasted damping behaviors.

Type: Article
Title: Attenuation Coefficient of Single-Mode Periodic Waveguides
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.107.153901
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.107.153901
Language: English
Additional information: © 2011 American Physical Society
Keywords: SLOW LIGHT, DISORDER
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1338436
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