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Authors = Fetah Benabid

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16 pages, 1742 KiB  
Article
Modeling and Analysis of the Transverse Surface Roughness in Hollow-Core Fibers
by Federico Melli, Kostiantyn Vasko, Lorenzo Rosa, Fetah Benabid and Luca Vincetti
Fibers 2025, 13(4), 36; https://doi.org/10.3390/fib13040036 - 27 Mar 2025
Viewed by 699
Abstract
The corrugation of the interfaces of the cross-section of hollow core fibers based on the inhibited coupling waveguiding mechanism is modeled and the impact on propagation loss analyzed. The proposed model is based on a combined use of coupled-mode theory and Azimuthal Fourier [...] Read more.
The corrugation of the interfaces of the cross-section of hollow core fibers based on the inhibited coupling waveguiding mechanism is modeled and the impact on propagation loss analyzed. The proposed model is based on a combined use of coupled-mode theory and Azimuthal Fourier Decomposition. It shows that such transverse roughness causes coupling between the core modes and the dielectric modes of the cladding and consequently an increase of the fiber loss. The model is validated by comparing theoretical and numerical results obtained by applying both deterministic and stochastic corrugations to tubular lattice and nested fibers. Scaling laws and impact of the fibers’ parameters are discussed. The model shows that the loss increase is not directly correlated to the root mean square of the stochastic roughness but only to the value of the power spectral density in specific spatial frequency ranges. In particular, the spectral components characterized by a periodicity lower than 101 of the tube circumference must have a power spectral density value lower than 0.2 nm2 to ensure a negligible effect of the transverse roughness on fibers with losses lower than 0.1 dB/Km. Full article
(This article belongs to the Special Issue Characterization and Applications of Specialty Optical Fibers)
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11 pages, 2229 KiB  
Article
Hollow-Core Fiber-Based Biosensor: A Platform for Lab-in-Fiber Optical Biosensors for DNA Detection
by Foroogh Khozeymeh, Federico Melli, Sabrina Capodaglio, Roberto Corradini, Fetah Benabid, Luca Vincetti and Annamaria Cucinotta
Sensors 2022, 22(14), 5144; https://doi.org/10.3390/s22145144 - 8 Jul 2022
Cited by 23 | Viewed by 2959
Abstract
In this paper, a novel platform for lab-in-fiber-based biosensors is studied. Hollow-core tube lattice fibers (HC-TLFs) are proposed as a label-free biosensor for the detection of DNA molecules. The particular light-guiding mechanism makes them a highly sensitive tool. Their transmission spectrum is featured [...] Read more.
In this paper, a novel platform for lab-in-fiber-based biosensors is studied. Hollow-core tube lattice fibers (HC-TLFs) are proposed as a label-free biosensor for the detection of DNA molecules. The particular light-guiding mechanism makes them a highly sensitive tool. Their transmission spectrum is featured by alternations of high and low transmittance at wavelength regions whose values depend on the thickness of the microstructured web composing the cladding around the hollow core. In order to achieve DNA detection by using these fibers, an internal chemical functionalization process of the fiber has been performed in five steps in order to link specific peptide nucleic acid (PNA) probes, then the functionalized fiber was used for a three-step assay. When a solution containing a particular DNA sequence is made to flow through the HC of the TLF in an ‘optofluidic’ format, a bio-layer is formed on the cladding surfaces causing a red-shift of the fiber transmission spectrum. By comparing the fiber transmission spectra before and after the flowing it is possible to identify the eventual formation of the layer and, therefore, the presence or not of a particular DNA sequence in the solution. Full article
(This article belongs to the Special Issue Sensors Based on Photonic Crystal Fiber)
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58 pages, 15866 KiB  
Review
Hollow-Core Fiber Technology: The Rising of “Gas Photonics”
by Benoît Debord, Foued Amrani, Luca Vincetti, Frédéric Gérôme and Fetah Benabid
Fibers 2019, 7(2), 16; https://doi.org/10.3390/fib7020016 - 18 Feb 2019
Cited by 169 | Viewed by 22947
Abstract
Since their inception, about 20 years ago, hollow-core photonic crystal fiber and its gas-filled form are now establishing themselves both as a platform in advancing our knowledge on how light is confined and guided in microstructured dielectric optical waveguides, and a remarkable enabler [...] Read more.
Since their inception, about 20 years ago, hollow-core photonic crystal fiber and its gas-filled form are now establishing themselves both as a platform in advancing our knowledge on how light is confined and guided in microstructured dielectric optical waveguides, and a remarkable enabler in a large and diverse range of fields. The latter spans from nonlinear and coherent optics, atom optics and laser metrology, quantum information to high optical field physics and plasma physics. Here, we give a historical account of the major seminal works, we review the physics principles underlying the different optical guidance mechanisms that have emerged and how they have been used as design tools to set the current state-of-the-art in the transmission performance of such fibers. In a second part of this review, we give a nonexhaustive, yet representative, list of the different applications where gas-filled hollow-core photonic crystal fiber played a transformative role, and how the achieved results are leading to the emergence of a new field, which could be coined “Gas photonics”. We particularly stress on the synergetic interplay between glass, gas, and light in founding this new fiber science and technology. Full article
(This article belongs to the Special Issue Hollow Core Optical Fibers)
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