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Keywords = transverse Anderson localization

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7 pages, 2328 KB  
Communication
Optimum Design of Glass–Air Disordered Optical Fiber with Two Different Element Sizes
by Jiajia Zhao, Changbang He, Haimei Luo, Yali Zhao, Yiyu Mao and Wangyang Cai
Photonics 2023, 10(3), 259; https://doi.org/10.3390/photonics10030259 - 28 Feb 2023
Viewed by 1632
Abstract
This paper presents a detailed study investigating the effect of the material refractive index distribution at the local position of a glass–air disordered optical fiber (G-DOF) on its localized beam radius. It was found that the larger the proportion of the glass material, [...] Read more.
This paper presents a detailed study investigating the effect of the material refractive index distribution at the local position of a glass–air disordered optical fiber (G-DOF) on its localized beam radius. It was found that the larger the proportion of the glass material, the smaller its localized beam radius, which means that the transverse Anderson localization (TAL) effect would be stronger. Accordingly, we propose a novel G-DOF with large-size glass elements doped in the fiber cross-section. The simulation results show that the doped large-size glass elements can reduce the localized beam radius in the doped region and has a very tiny effect on the undoped region, thus contributing to reducing the average localized beam radius of G-DOF. Full article
(This article belongs to the Special Issue Fiber Optics and Its Applications)
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6 pages, 1396 KB  
Communication
Transverse Anderson Localization Enhancement for Low-Filling-Rate Glass–Air Disordered Fibers by Optimizing the Diameter of Air Holes
by Jiajia Zhao, Yali Zhao, Changbang He, Jinshuai Zhang, Yiyu Mao, Wangyang Cai and Haimei Luo
Photonics 2022, 9(12), 905; https://doi.org/10.3390/photonics9120905 - 26 Nov 2022
Cited by 1 | Viewed by 2193
Abstract
We demonstrate a method to enhance the transverse Anderson localization (TAL) effect of the glass–air disordered optical fiber (G-DOF) by adjusting the number and diameter of air holes. This method does not need to enlarge the air-filling fraction of G-DOF, leading to the [...] Read more.
We demonstrate a method to enhance the transverse Anderson localization (TAL) effect of the glass–air disordered optical fiber (G-DOF) by adjusting the number and diameter of air holes. This method does not need to enlarge the air-filling fraction of G-DOF, leading to the mitigation of fabrication complexity. By choosing the appropriate diameter and number of air holes, the average localized beam radius of G-DOF with the highest air-filling fraction of 30% can be successfully reduced by 18%. Moreover, the proposed method is always functional for the situations of the air-filling fraction lower than 50%. We also identify that, under the same air-filling fraction, a larger number of air holes in the G-DOF leads to the smaller standard deviation of the corresponding localized beam radius, indicating a stable fiber structure. The results will provide new guidance on the G-DOF design. Full article
(This article belongs to the Special Issue Specialty Optical Fibers and Their High-Power Applications)
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8 pages, 1019 KB  
Review
Transverse Anderson Localization in Disordered Glass Optical Fibers: A Review
by Arash Mafi, Salman Karbasi, Karl W. Koch, Thomas Hawkins and John Ballato
Materials 2014, 7(8), 5520-5527; https://doi.org/10.3390/ma7085520 - 28 Jul 2014
Cited by 11 | Viewed by 6858
Abstract
Disordered optical fibers show novel waveguiding properties that can be used for various device applications, such as beam-multiplexed optical communications and endoscopic image transport. The strong transverse scattering from the transversely disordered optical fibers results in transversely confined beams that can freely propagate [...] Read more.
Disordered optical fibers show novel waveguiding properties that can be used for various device applications, such as beam-multiplexed optical communications and endoscopic image transport. The strong transverse scattering from the transversely disordered optical fibers results in transversely confined beams that can freely propagate in the longitudinal direction, similar to conventional optical fibers, with the advantage that any point in the cross section of the fiber can be used for beam transport. For beam multiplexing and imaging applications, it is highly desirable to make the localized beam radius as small as possible. This requires large refractive index differences between the materials that define the random features in the disordered fiber. Here, disordered glass-air fibers are briefly reviewed, where randomly placed airholes in a glass matrix provide the sufficiently large refractive index difference of 0.5 for strong random transverse scattering. The main future challenge for the fabrication of an optimally disordered glass-air fibers is to increase the fill-fraction of airholes to nearly 50% for maximum beam confinement. Full article
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