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Light extraction from fundamental modes in modulated waveguides for homogeneous side-emission

Dedicated control of axial light emission from light-guides enables a new generation of functional light sources for volumetric illumination. A primary challenge is to ensure homogeneous emission intensity across the full length of the device. Here, we introduce an approach towards homogeneously sid...

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Detalles Bibliográficos
Autores principales: Pan, Zhiwen, Wondraczek, Lothar
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6015090/
https://www.ncbi.nlm.nih.gov/pubmed/29934607
http://dx.doi.org/10.1038/s41598-018-27916-x
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author Pan, Zhiwen
Wondraczek, Lothar
author_facet Pan, Zhiwen
Wondraczek, Lothar
author_sort Pan, Zhiwen
collection PubMed
description Dedicated control of axial light emission from light-guides enables a new generation of functional light sources for volumetric illumination. A primary challenge is to ensure homogeneous emission intensity across the full length of the device. Here, we introduce an approach towards homogeneously side-emitting waveguides which do not rely on imposing local scattering centers such as bubbles, micro-/nanoparticles, and rough or abrupt interfaces, but on modulated core radius. Previous quantitative studies of the relationship between structural parameters and radiation losses provide initial conditions for tailoring side-emission through core-diameter modulations, however, with strongly limited amplitude of modulation. We now employ and verify numerical simulation to overcome this limitation towards meter-long homogeneously side-emitting waveguides in which the amplitude of core-diameter modulation is of the same order of magnitude as the core diameter itself. Similar emission properties can be obtained through modulation of the core refractive index instead of the core diameter, or through a combination of both approaches. Using the present model, we deduce exemplary conditions for homogeneous side-emission in which the power flow within the waveguides decays linearly, what may present another interesting feature for applications beyond illumination.
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spelling pubmed-60150902018-07-06 Light extraction from fundamental modes in modulated waveguides for homogeneous side-emission Pan, Zhiwen Wondraczek, Lothar Sci Rep Article Dedicated control of axial light emission from light-guides enables a new generation of functional light sources for volumetric illumination. A primary challenge is to ensure homogeneous emission intensity across the full length of the device. Here, we introduce an approach towards homogeneously side-emitting waveguides which do not rely on imposing local scattering centers such as bubbles, micro-/nanoparticles, and rough or abrupt interfaces, but on modulated core radius. Previous quantitative studies of the relationship between structural parameters and radiation losses provide initial conditions for tailoring side-emission through core-diameter modulations, however, with strongly limited amplitude of modulation. We now employ and verify numerical simulation to overcome this limitation towards meter-long homogeneously side-emitting waveguides in which the amplitude of core-diameter modulation is of the same order of magnitude as the core diameter itself. Similar emission properties can be obtained through modulation of the core refractive index instead of the core diameter, or through a combination of both approaches. Using the present model, we deduce exemplary conditions for homogeneous side-emission in which the power flow within the waveguides decays linearly, what may present another interesting feature for applications beyond illumination. Nature Publishing Group UK 2018-06-22 /pmc/articles/PMC6015090/ /pubmed/29934607 http://dx.doi.org/10.1038/s41598-018-27916-x Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Pan, Zhiwen
Wondraczek, Lothar
Light extraction from fundamental modes in modulated waveguides for homogeneous side-emission
title Light extraction from fundamental modes in modulated waveguides for homogeneous side-emission
title_full Light extraction from fundamental modes in modulated waveguides for homogeneous side-emission
title_fullStr Light extraction from fundamental modes in modulated waveguides for homogeneous side-emission
title_full_unstemmed Light extraction from fundamental modes in modulated waveguides for homogeneous side-emission
title_short Light extraction from fundamental modes in modulated waveguides for homogeneous side-emission
title_sort light extraction from fundamental modes in modulated waveguides for homogeneous side-emission
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6015090/
https://www.ncbi.nlm.nih.gov/pubmed/29934607
http://dx.doi.org/10.1038/s41598-018-27916-x
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