Publications by authors named "Charles Henri Hage"

Article Synopsis
  • The paper discusses the use of plasmonic photothermal therapy for targeting uropathogenic bacteria using reduced graphene oxide and gold nanorods/rGO composites.
  • An expression of concern has been published, addressing potential issues related to the methodology or data integrity in the research.
  • Researchers are encouraged to critically review the findings and verify the results to ensure scientific accuracy and reliability.
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Article Synopsis
  • The article discusses the development of gold nanorods with a silica core-shell structure, which are enhanced with verteporfin, a photosensitizer used in photodynamic therapy.
  • It emphasizes the high effectiveness of these nanostructures in the photodynamic inactivation of targeted cells or pathogens.
  • The authors express concern regarding potential issues or limitations identified in the study, which may impact the reproducibility or applicability of the findings in clinical settings.
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Expression of concern for 'Particle-based photodynamic therapy based on indocyanine green modified plasmonic nanostructures for inactivation of a Crohn's disease-associated strain' by Roxana Jijie , , 2016, , 2598-2605, https://doi.org/10.1039/C5TB02697K.

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Beam self-cleaning (BSC) in graded-index (GRIN) multimode fibers (MMFs) has been recently reported by different research groups. Driven by the interplay between Kerr effect and beam self-imaging, BSC counteracts random mode coupling, and forces laser beams to recover a quasi-single mode profile at the output of GRIN fibers. Here we show that the associated self-induced spatiotemporal reshaping allows for improving the performances of nonlinear fluorescence (NF) microscopy and endoscopy using multimode optical fibers.

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A two-photon fluorescence lifetime (2P-FLIM) microendoscope, capable of energetic metabolism imaging through the intracellular nicotinamide adenine dinucleotide (NADH) autofluorescence, at sub-cellular resolution, is demonstrated. It exhibits readily usable characteristics such as convenient endoscope probe diameter (≈2 mm), fiber length (>5 m) and data accumulation rate (16 frames per second (fps)), leading to a FLIM refreshing rate of ≈0.1 to 1 fps depending on the sample.

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Particle-based photodynamic therapy (PPDT) holds great promise in theranostic applications. Herein, we demonstrate that PPDT based on gold nanorods coated with an indocyanine green (ICG)-loaded silica shell allows for the inactivation of the Crohn's disease-associated adherent-invasive Escherichia coli strain LF82 (E. coli LF82) under pulsed laser light irradiation at 810 nm.

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The potential of gold nanorods post-coated with a 20 nm silica shell loaded with verteporfin (Au NRs@SiO2-VP) as efficient near-infrared nanostructures for photodynamic therapy under continuous wave and pulsed-mode excitation to eradicate a virulent strain of E. coli associated with urinary tract infection is described.

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Pseudodiaptomus marinus copepods are small crustaceans living in estuarine areas endowed with exceptional swimming and adaptative performances. Since the external cuticle acts as an impermeable barrier for most dyes and molecular tools for labeling copepod proteins with fluorescent tags are not available, imaging cellular organelles in these organisms requires label free microscopy. Complementary nonlinear microscopy techniques have been used to investigate the structure and the response of their myofibrils to abrupt changes of temperature or/and salinity.

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Article Synopsis
  • Developing alternatives to antibiotics for treating infections caused by Gram-negative uropathogenic E. coli is challenging, necessitating new treatment strategies.
  • The study presents pegylated reduced graphene oxide nanoparticles (rGO-PEG) and gold nanorods coated with rGO-PEG (rGO-PEG-Au NRs) that can effectively kill uropathogenic E. coli UTI89 using a photothermal method, achieving up to 99% bacterial death in just 10 minutes.
  • The rGO-PEG-Au NRs outperformed rGO-PEG in effectiveness, especially when functionalized with specific probes, suggesting a promising new approach for treating urinary infections in a biocompatible manner.
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Coherent anti-Stokes Raman scattering (CARS) microscopy is a powerful tool for chemical analysis at a subcellular level, frequently used for imaging lipid dynamics in living cells. We report a high-power picosecond fiber-based laser and its application for optical parametric oscillator (OPO) pumping and CARS microscopy. This fiber-based laser has been carefully characterized.

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We describe a fiber-based device that can significantly enhance the low-intensity fluctuations of an ultrashort pulse train to detect them more easily than with usual direct detection systems. Taking advantage of the Raman intrapulse effect that progressively shifts the central frequency of a femtosecond pulse propagating in an anomalous dispersion fiber, a subsequent spectral filtering can efficiently increase the level of fluctuations by more than 1 order of magnitude. We show that attention has to be paid to maintain the shape of the statistical distribution unaffected by the nonlinear process.

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