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Bulk and localized plasmonic heating in nanogold doped polymers
摘要： Colloidal gold (Auc) nanoparticles (GNPs) and nanorods (GNRs) were incorporated into polymer blend ?lms and electrospun ?bers to utilize the nanoparticle plasmonic response for localized heating of the polymer. In this work, mathematical modeling was used to describe the GNP distribution and heat/melt pro?le surrounding each GNP in the polymer blend, demonstrating that a bulk temperature change of only 0.2 °C results in a 20-nm-diameter melted polymer sphere around the GNP. In addition, it was shown that by reducing the radius of polymer material around the GNP through the use of electrospinning ?bers in place of thin ?lm deposition, heating of the bulk material increased by 72%. Bulk heating of polymer blend ?lms containing either GNPs or GNRs was mapped using an infrared camera system with light-emitting diodes (LEDs) at 530 and 810 nm. The change in temperature observed in the thin ?lms was used to calculate the photo-thermal energy conversion ef?ciency of the respective nanogold doped polymer thin ?lms. Signi?cantly, GNR-doped ?lm ef?ciencies recorded were up to 6.6 times (558.6% increase) that of the polymer blend-only ?lm when interrogated at 810 nm, while the GNP-doped ?lm ef?ciency increased by 1.8 times (75.7% increase) under the 530 nm LED.
关键词： nanogold doped polymers,photothermal energy conversion,electrospun fibers,plasmonic heating
更新于2025-09-16 10:30:52
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Polarization Organisation Hidden in the Middle Point of an Optical Fiber
摘要： Since the pioneering studies on polarization dynamics of two counter-propagating beams in nonlinear optical fibers, different processes of polarization attraction have been identified in isotropic fiber, but also in highly, weakly and randomly birefringent fibers. In this framework, the polarization attraction requires a fully polarized pump wave, which plays the role of a natural attractor for an arbitrary polarized incoming beam. Subsequently, this phenomenon has been observed using a single wave interacting with its own back-reflected wave in a feedback loop configuration. Here, we report a new configuration of polarization self-organization with two uncorrelated arbitrary polarized waves that occurs in the middle point of an optical isotropic fiber. The state of polarization (SOP) of the two counterpropagating waves evolves and fluctuates over the surface of the Poincaré sphere with a coherence time τc. During the propagation, the SOP is deeply modified by the nonlinear interaction: While the injected SOPs fluctuate all over the Poincaré spheres, the SOPs in the middle point of the fiber are attracted toward the poles of the spheres, which correspond to the circular polarization states of the fields. Then both waves recover a random state at their corresponding fiber outputs. This effect has been demonstrated experimentally considering 256 randomly distributed initial pulses in an 200-m long isotropic fiber.
关键词： coherence time,optical fibers,polarization attraction,Poincaré sphere,polarization dynamics
更新于2025-09-16 10:30:52
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Radiation Effects in Materials || Effects of Electron Irradiation Upon Absorptive and Fluorescent Properties of Some Doped Optical Fibers
摘要： A review of the recent studies of the effect of irradiating silica-based fibers doped with rare earths and metals by a beam of high-energy (β) electrons is presented. Of the review’s main scope are the attenuation spectra’ transformations occurring in optical fiber of such types under electron irradiation, allowing, from one side, to recover some general essence of the phenomena involved and, from the other side, to draw the features that would make such fibers useful for applications, for example, in dosimetry and space technologies. Among the fibers of the current review’s choice, exemplifying the effect of electron irradiation most brightly, are ytterbium (Yb) and cerium (Ce) (the rare earths’ representatives) and bismuth (Bi) (the post-transitional metals representative) doped fibers, where a diversity of the electron-irradiation-related effects is encouraged.
关键词： optical bleaching,photodarkening,cerium- and bismuth-doped silica fibers,electron irradiation,ytterbium-
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Economical Solution for Cladding Etched Optical Fibers
摘要： We demonstrate an economical wet etching solution for optical fibers using glass etching cream. The etching performance and surface quality on optical fibers are investigated. The solution offers good controllability and repeatable outcomes.
关键词： optical fibers,glass etching cream,Chemical wet etching
更新于2025-09-16 10:30:52
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Plasmonic Response of Light-Activated, Nano-Gold Doped Polymers
摘要： Incorporation of metallic nanoparticles (NPs) in polymer matrix has been used to enhance and control dissolution and release of drugs, for targeted drug delivery, as antimicrobial agents, localized heat sources, and for unique optoelectronic applications. Gold NPs in particular exhibit a plasmonic response that has been utilized for photothermal energy conversion. Because plasmonic nanoparticles typically exhibit a plasmon resonance frequency similar to the visible light spectrum, they present as good candidates for direct photothermal conversion with enhanced solar thermal efficiency in these wavelengths. In our work, we have incorporated ~3-nm-diameter colloidal gold (Auc) NPs into electrospun polyethylene glycol (PEG) fibers to utilize the nanoparticle plasmonic response for localized heating and melting of the polymer to release medical treatment. Auc and Auc in PEG (PEG+Auc) both exhibited a minimum reflectivity at 522 nm or approximately green wavelengths of light under ultraviolet-visible (UV-Vis) spectroscopy. PEG+Auc ES fibers revealed a blue shift in minimum reflectivity at 504 nm. UV-Vis spectra were used to calculate the theoretical efficiency enhancement of PEG+Auc versus PEG alone, finding an approximate increase of 10 % under broad spectrum white light interrogation, and ~14 % when illuminated with green light. Auc enhanced polymers were ES directly onto resistance temperature detectors and interrogated with green laser light so that temperature change could be recorded. Results showed a maximum increase of 8.9 °C. To further understand how gold nanomaterials effect the complex optical properties of our materials, spectroscopic ellipsometry was used. Using spectroscopic ellipsometry and modeling with CompleteEASE? software, the complex optical constants of our materials were determined. The complex optical constant n (index of refraction) provided us with optical density properties related to light wavelength divided by velocity, and k (extinction coefficient) was used to show the absorptive properties of the materials.
关键词： spectroscopic ellipsometry,photothermal energy conversion,polyethylene glycol,metallic nanoparticles,plasmonic response,UV-Vis spectroscopy,gold NPs,electrospun fibers
更新于2025-09-16 10:30:52
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Enhancement of thermal and electro-optical properties of photonic crystal fibers infiltrated with a modified 6CHBT nematic liquid crystal doped with gold nanoparticles
摘要： In this paper we present the obtained experimental results for enhancing the parameters of photonic crystal fibers infiltrated with a modified 6CHBT doped with gold nanoparticles. By admixing a special liquid crystalline material we were able to widen the working temperature range of our samples. Doping our liquid crystal mixture with nanoparticles visibly enhances the thermal and electro-optical properties of the infiltrated photonic crystal fibers. Additionally, the use of a specially designed four microelectrode system allowed to decrease voltage. Thanks to the introduced modifications we noticed a significant reduction of threshold voltages (up to 44%), rise times (up to 30%) and fall times (up to 50%).
关键词： Photonic crystal fibers,Nanoparticles,Liquid crystals
更新于2025-09-16 10:30:52
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Synthesis and characterization of electro-spun TiO <sub/>2</sub> and TiO <sub/>2</sub> -SnO <sub/>2</sub> composite nano-fibers for application in advance generation solar cells
摘要： Due to rapid progressive research in the field of nano-technology, nanostructures are attaining tremendous deliberation. Precisely, among these, nano-fibers have accumulated unprecedented attention over the last few years owing to their superior properties such as large surface area to volume ratio. For advance generation solar cells, nano-fibers of metal oxides such as TiO2 have been widely employed as a working anode but due to the disadvantages of recombination of electrons, their coupling with other metal oxides is necessary to render them useful. This work reports the successful fabrication of TiO2, TiO2/SnO2 nano-fibers based film and study of the effect of polymer concentration upon it. The crystal structure of synthesized fibers was investigated using XRD, the morphology and chemical composition was analyzed using SEM and EDX, optical properties and chemical properties were studied using UV-VIS spectrophotometer and FT-IR while the electrical properties were studied using Hall Effect measurement system. It was revealed that the prepared TiO2-SnO2 nano-fibers exhibit enhanced conductivity, larger band-gap with enhanced photo voltaic properties than TiO2 nano-fibers. The prepared TiO2/SnO2 nano-fibers based solar cells provide an improved efficiency of 4.81% as compared to 1.8% efficiency of bare TiO2 nano-fibers.
关键词： nano-fibers,titanium oxide,tin oxide,solar cells,electro-spinning
更新于2025-09-16 10:30:52
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Lyot Filter With Femtosecond Laser-Induced High Birefringence Single-Mode Fiber for Torsion, Transverse Load and Temperature Sensing
摘要： We propose and experimentally demonstrate an all-fiber Lyot filter with femtosecond laser-induced high birefringence single-mode fiber (SMF) for torsion, transverse load and temperature sensing. With the femtosecond-laser processing technique, the SMF with the birefringence of 2.81×10?4 is manufactured by directly writing a straight cladding stress track parallel with fiber core and employed to form an all-fiber Lyot filter for sensing application. The sensitivities of the all-fiber Lyot filter with respect to torsion, transverse load and temperature are found to be ?4265.669 nm/(rad/mm), ?321.004 nm/(N/mm), and 0.271 nm/?C, respectively. The experimental results are powerful proof of the excellent performance of the femtosecond laser-induced high birefringence SMF based all-fiber Lyot filter for sensing application, which not only adds significantly new and important results to the fields of optical sensing, but also develops the application fields of femtosecond-laser processing technique and all-fiber Lyot filter.
关键词： filters,polarization interference,Optical fiber sensors,ultrafast processes in fibers,fiber birefringence
更新于2025-09-16 10:30:52
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[IEEE 2019 24th OptoElectronics and Communications Conference (OECC) and 2019 International Conference on Photonics in Switching and Computing (PSC) - Fukuoka, Japan (2019.7.7-2019.7.11)] 2019 24th OptoElectronics and Communications Conference (OECC) and 2019 International Conference on Photonics in Switching and Computing (PSC) - Stable Measurement of Near/Far Field Profiles of Coupled Multi-Core Fiber
摘要： A low-coherence method is presented for measuring stable near-field and far-field profiles of coupled multi-core fibers. Stability is achieved by averaging output intensity over wavelength to eliminate time-varying intensity fluctuations caused by coupling and interference.
关键词： Fiber characterization and measurement techniques,Fibers for space division multiplexing
更新于2025-09-16 10:30:52
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A Dual Hollow Core Antiresonant Optical Fiber Coupler Based on a Highly Birefringent Structure-Numerical Design and Analysis
摘要： With the growing interest in hollow-core antiresonant fibers (HC-ARF), attributed to the development of their fabrication technology, the appearance of more sophisticated structures is understandable. One of the recently advancing concepts is that of dual hollow-core antiresonant fibers, which have the potential to be used as optical fiber couplers. In the following paper, a design of a dual hollow-core antiresonant fiber (DHC-ARF) acting as a polarization fiber coupler is presented. The structure is based on a highly birefringent hollow-core fiber design, which is proven to be a promising solution for the purpose of propagation of polarized signals. The design of an optimized DHC-ARF with asymmetrical cores is proposed, together with analysis of its essential coupling parameters, such as the extinction ratio, coupling length ratio, and coupling strength. The latter two for the x- and y-polarized signals were ~2 and 1, respectively, while the optical losses were below 0.3 dB/cm in the 1500–1700 nm transmission band.
关键词： hollow-core optical fiber couplers,polarization splitters,optical fiber design,optical fiber couplers,hollow-core antiresonant fibers
更新于2025-09-16 10:30:52