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Journal articles on the topic 'Air-silica structured fibre'

Author: Grafiati

Published: 4 June 2021

Last updated: 21 February 2023

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1

Canning, John, Nathaniel Groothoff, Kevin Cook, et al. "Gratings in Structured Optical Fibres." Laser Chemistry 2008 (December 1, 2008): 1–19. http://dx.doi.org/10.1155/2008/239417.

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Grating writing in structured optical fibres and their properties and applications are reviewed. To date, most gratings have been written in a straightforward manner into structured fibres containing a photosensitive germanosilicate step-index core. However, gratings have also been written directly into single material, structured silica fibres and into air-clad cores using two and higher-photon processes with both UV and near IR pulsed (nanosecond-femtosecond) light. Given the intrinsic-added functionality possible within a structured optical fibre, structured fibre gratings offer further cap

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2

Canning, J., E. Buckley, K. Lyttikainen, and T. Ryan. "Wavelength dependent leakage in a Fresnel-based air–silica structured optical fibre." Optics Communications 205, no. 1-3 (2002): 95–99. http://dx.doi.org/10.1016/s0030-4018(02)01305-6.

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Ahmadov, Nizami, and Irade Shirinzade. "Development of effective fiber-reinforced concrete compositions used in transportation structures." Eastern-European Journal of Enterprise Technologies 2, no. 1 (110) (2021): 6–11. http://dx.doi.org/10.15587/1729-4061.2021.227139.

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The possibility of producing fiber-reinforced concrete with high deformation properties by regulating the microstructure and using it in the design of transport structures was considered. It was found that to create high-performance transport structures, it is necessary to modify fiber mixtures with complex additives, i. e. increase the strength of fiber-reinforced concrete at the micro-level. To obtain a denser structure of the concrete matrix, complex additives were used – ultrafine additive (silica fume) and Master Air 200 B air-entraining additive. It was experimentally proved that using s

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Canning, J., M. A. van Eijkelenborg, T. Ryan, M. Kristensen, and K. Lyytikainen. "Complex mode coupling within air–silica structured optical fibres and applications." Optics Communications 185, no. 4-6 (2000): 321–24. http://dx.doi.org/10.1016/s0030-4018(00)01022-1.

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Vo, Thi Minh Ngoc, Dinh Quang Ho, Tung Thanh Le, et al. "Numerical simulation of all-normal dispersion visible to near-infrared supercontinuum generation in photonic crystal fibers with core filled chloroform." Hue University Journal of Science: Natural Science 130, no. 1B (2021): 43–51. http://dx.doi.org/10.26459/hueunijns.v130i1b.6243.

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This study proposes a photonic crystal fiber made of fused silica glass, with the core infiltrated with chloroform as a new source of supercontinuum (SC) spectrum. We numerically study the guiding properties of the fiber structure in terms of characteristic dispersion and mode area of the fundamental mode. Based on the results, we optimized the structural geometries of the CHCl3-core photonic crystal fiber to support the broadband SC generations. The fiber structure with a lattice constant of 1 μm, a filling factor of 0.8, and the diameter of the first-ring air holes equaling 0.5 μm operates i

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Gowre, Sanjaykumar, Sudipta Mahapatra, and P. K. Sahu. "A Modified Structure for All-Glass Photonic Bandgap Fibers: Dispersion Characteristics and Confinement Loss Analysis." ISRN Optics 2013 (September 22, 2013): 1–5. http://dx.doi.org/10.1155/2013/416537.

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This paper investigates a modified structure for all-glass photonic bandgap fiber (AGPBF) having up-doped silica rods in the cladding region instead of air holes using plane wave expansion (PWE) and finite difference time domain (FDTD) methods. The proposed AGPBF structure exhibits tunable dispersion properties and improved confinement loss. It is observed that the confinement loss can be reduced simply by using a higher doping concentration in silica rods in the cladding. Also, it is possible to achieve flattened dispersion of the order of 1 ps/nm/km over a wide wavelength range.

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Zhang, Pengfei, Chao Wang, Liuwei Wan, et al. "Opto-Microfluidic Fabry-Perot Sensor with Extended Air Cavity and Enhanced Pressure Sensitivity." Micromachines 13, no. 1 (2021): 19. http://dx.doi.org/10.3390/mi13010019.

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An opto-microfluidic static pressure sensor based on a fiber Fabry-Perot Interferometer (FPI) with extended air cavity for enhancing the measuring sensitivity is proposed. The FPI is constructed in a microfluidic channel by the combination of the fixed fiber-end reflection and floating liquid surface reflection faces. A change of the aquatic pressure will cause a drift of the liquid surface and the pressure can be measured by detecting the shift of the FPI spectrum. Sensitivity of the sensor structure can be enhanced significantly by extending the air region of the FPI. The structure is manufa

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Hieu. "INFLUENCE OF STRUCTURE PARAMETERS ON THE SUPERCONTINUUM GENERATION OF PHOTONIC CRYSTAL FIBER." Journal of Military Science and Technology, no. 67 (June 12, 2020): 161–68. http://dx.doi.org/10.54939/1859-1043.j.mst.67.2020.161-168.

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In this paper, we report a numerical calculation of the influence of structural parameters on the supercontinuum generation of photonic crystal fibers. A photonic crystal fiber based on the fused silica glass, eight rings of air holes ordered in a hexagonal lattice, is proposed. Guiding properties in terms of dispersion and confinement loss of the fundamental mode are also studied numerically. As a result, the broadband width of the supercontinuum spectrum will increase when the lattice pitch decreases or the diameter of air hole in the cladding increases. However, the coherence of SC will bec

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Rana, Sohel, Austin Fleming, Nirmala Kandadai, and Harish Subbaraman. "Active Compensation of Radiation Effects on Optical Fibers for Sensing Applications." Sensors 21, no. 24 (2021): 8193. http://dx.doi.org/10.3390/s21248193.

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Neutron and gamma irradiation is known to compact silica, resulting in macroscopic changes in refractive index (RI) and geometric structure. The change in RI and linear compaction in a radiation environment is caused by three well-known mechanisms: (i) radiation-induced attenuation (RIA), (ii) radiation-induced compaction (RIC), and (iii) radiation-induced emission (RIE). These macroscopic changes induce errors in monitoring physical parameters such as temperature, pressure, and strain in optical fiber-based sensors, which limit their application in radiation environments. We present a cascade

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Sanjuán, Miguel Ángel, and Carmen Andrade. "Reactive Powder Concrete: Durability and Applications." Applied Sciences 11, no. 12 (2021): 5629. http://dx.doi.org/10.3390/app11125629.

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Reactive powder concrete (RPC) is an ultra-high-performance concrete (UHPC) developed years ago by Bouygues, with the aim to build strong, durable, and sustainable structures. Some differences can be underlined between the RPC and high-performance concrete (HPC); that is to say, RPC exhibits higher compressive and flexural strength, higher toughness, lower porosity, and lower permeability compared to HPC. Microstructural observations confirm that silica fume enhances the fiber–matrix interfacial characteristics, particularly in fiber pullout energy. This paper reviews the reported literature o

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Journal, Baghdad Science. "Dispersion in a Gas Filled Hollow Core Photonic Crystal Fiber." Baghdad Science Journal 11, no. 3 (2014): 1250–56. http://dx.doi.org/10.21123/bsj.11.3.1250-1256.

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Hollow core photonic bandgap fibers provide a new geometry for the realization and enhancement of many nonlinear optical effects. Such fibers offer novel guidance and dispersion properties that provide an advantage over conventional fibers for various applications. Dispersion, which expresses the variation with wavelength of the guided-mode group velocity, is one of the most important properties of optical fibers. Photonic crystal fibers (PCFs) offer much larger flexibility than conventional fibers with respect to tailoring of the dispersion curve. This is partly due to the large refractive-in

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POPESCU, V. A. "A VERY HIGH AMPLITUDE SENSITIVITY OF A NEW MULTI-CORE HOLEY FIBER-BASED PLASMONIC SENSOR." Modern Physics Letters B 27, no. 06 (2013): 1350038. http://dx.doi.org/10.1142/s0217984913500383.

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The propagation characteristics in a new multi-core holey fiber-based plasmonic sensor are investigated using a finite element method. The fiber is made by a silica core with a small air hole in the center of the structure, surrounded by six air holes placed at the vertices of a hexagon, two layers of air holes arranged in a hexagonal way that are inserted in the SiO 2 core which is surrounded by a gold layer and a very thick distilled water layer. The structure is designed to have high amplitude sensitivity near the phase matching point corresponding to the maximum of the power fraction for a

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Moayed, Seyed Hossein, Mojtaba Sadeghi, and Zahra Adelpour. "Design of new infrared nano sensor based on surface plasmon resonance photonic crystal fibers." Laser Physics 32, no. 10 (2022): 105101. http://dx.doi.org/10.1088/1555-6611/ac87f5.

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Abstract In this paper, five different surface plasmon resonance photonic crystal fiber (SPR-PCF) structures are proposed and evaluated by numerical modeling. The structures are based on photonic crystal fibers with defects rods of air, Au, and TiN in the background of silica. In the fourth and fifth designs, two grooves coated with gold layers are considered to improve the functionality of the structures and help the analyte to become closer to the fiber core. The effects of geometrical parameters like radius, thickness, and width on the loss spectrum are also investigated, and the results ar

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Mei, Chao, Yuan Wu, Jinhui Yuan, Shi Qiu, and Xian Zhou. "Design of Compact and Broadband Polarization Beam Splitters Based on Surface Plasmonic Resonance in Photonic Crystal Fibers." Micromachines 13, no. 10 (2022): 1663. http://dx.doi.org/10.3390/mi13101663.

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In this work, a polarization beam splitter (PBS) based on surface plasmonic resonance is proposed and realized in a designed photonic crystal fiber (PCF). The PCF consists of two kinds of air holes with different diameters. Two solid silica cores near the center of the PCF are established by removing the cladding air holes. A gold film is plated at the external surface of the central air hole of the PCF to excite the surface plasmonic resonance. In order to minimize the length and improve the operation bandwidth of the PBS, the influences of the transversal structural parameters of the PCF are

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15

Drljača, Branko, Svetislav Savović, Milan S. Kovačević, et al. "Theoretical Investigation of Bandwidth in Multimode Step-Index Silica Photonic Crystal Fibers." Photonics 9, no. 4 (2022): 214. http://dx.doi.org/10.3390/photonics9040214.

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Solving the time-dependent power flow equation (PFE) provides a useful method to study the transmission bandwidth of step-index silica photonic crystal fibers (SI SPCFs). The transmission bandwidth of these kinds of fibers is determined for different air-hole structures (different numerical apertures (NAs)) and different distribution widths of the Gaussian launch beam. The results indicate that the lower the NA of SI SPCFs, the higher the bandwidth (for example, for a lower NA of SI SPCFs, a bandwidth that is eight times larger is obtained at a fiber length of 3500 m). The narrower launch beam

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Xia, Ping, Yuegang Tan, Caixia Yang, Zude Zhou, and Kang Yun. "A Composite Fabry-Perot Interferometric Sensor with the Dual-Cavity Structure for Simultaneous Measurement of High Temperature and Strain." Sensors 21, no. 15 (2021): 4989. http://dx.doi.org/10.3390/s21154989.

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In this paper, an optical fiber composite Fabry-Perot interferometric (CFPI) sensor capable of simultaneous measurement of high temperature and strain is presented. The CFPI sensor consists of a silica-cavity intrinsic Fabry-Perot interferometer (IFPI) cascading an air-cavity extrinsic Fabry-Perot interferometer (EFPI). The IFPI is constructed at the end of the transmission single-mode fiber (SMF) by splicing a short piece of photonic crystal fiber (PCF) to SMF and then the IFPI is inserted into a quartz capillary with a reflective surface to form a single-ended sliding EFPI. In such a configu

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17

Wang, Guan Jun, Zhi Bin Wang, You Hua Chen, et al. "Polarization-Insensitive Holey Fiber with Ultra-Small Mode Areas Using a Cross-Slot-Structure Core." Key Engineering Materials 609-610 (April 2014): 775–78. http://dx.doi.org/10.4028/www.scientific.net/kem.609-610.775.

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A high nonlinear, dispersion flattened hybrid nanofiber with a silicon/silica cross-slot-structure nanocore is firstly proposed and analyzed, which is insensitive to polarization for implementing quasi-TE and quasi-TM fundamental modes transmission due to cross slot effect. Simulation results show that fundamental mode of ultra-small mode effective areas and high nonlinearity at TE and TM polarizations, which are confined in the narrow cross slot by four silicon ribs, can be achieved via this cross sot structure core. Moreover, the cladding of four large-air-holes promotes tailoring the group

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18

Sultanov, R. M., R. R. Zinatullin, and S. A. Imamutdinov. "Modifying of air-mechanical foams using organosilicone compounds." IOP Conference Series: Earth and Environmental Science 981, no. 3 (2022): 032062. http://dx.doi.org/10.1088/1755-1315/981/3/032062.

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Abstract The results of studying the fire foams’ modification using organosilicone compounds are presented in this article. The results of comparative fighting flammable liquid fires (diesel fuel) using non-modified foam and modified foam are also studied. It is shown that fire fighting using foam, modified with organosilicone compounds is much more effective, because of the increasing isolating capacity of such foam due to high-solidifying formation of foam which prevent the liquid vapors from getting in the area of chemical reactions and also isolate the flammable liquid from the oxygen of t

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Fu, Yueqiao, Graham T. T. Gibson, Christine McGregor, and Richard D. Oleschuk. "Fabrication of a polymer nozzle array in a microstructured fibre as a nanoelectrospray emitter for mass spectrometry." Canadian Journal of Chemistry 93, no. 4 (2015): 477–84. http://dx.doi.org/10.1139/cjc-2014-0578.

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We report a modified silica microstructured fibre (MSF) as a multiple electrospray (MES) emitter, with dimensional compatibility with conventional liquid chromatography and mass spectrometry equipment, to generate stable electrospray from a wide range of applied potentials and flow rates. An array of polymer nozzles is fabricated in the MSF by a procedure involving templated polymerization of microtubes and wet chemical etching of the silica at the tip. The structure of the emitting end of the MSF was optimized with respect to the etching process, and the morphology of the polymer nozzles was

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Cui, Mingjie, Zhuo Wang, and Changyuan Yu. "Refractive Index Sensing Using Helical Broken-Circular-Symmetry Core Microstructured Optical Fiber." Sensors 22, no. 23 (2022): 9523. http://dx.doi.org/10.3390/s22239523.

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Helical twist provides an additional degree of freedom for controlling light in optical waveguides, expanding their applications in sensing. In this paper, we propose a helical broken-circular-symmetry core microstructured optical fiber for refractive index sensing. The proposed fiber consists of pure silica and its noncircular helical core is formed by a broken air ring. By using finite element modeling combined with transformation optics, the modal characteristics of the fiber are investigated in detail. The results show that for the core located at the fiber center, the confinement loss of

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Zatar, Wael, and Tu Nguyen. "Mixture Design Study of Fiber-Reinforced Self-Compacting Concrete for Prefabricated Street Light Post Structures." Advances in Civil Engineering 2020 (June 15, 2020): 1–7. http://dx.doi.org/10.1155/2020/8852320.

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In recent years, there has been an increasing demand to produce strong precast street light posts that are aesthetically pleasing. This study presents experimental results of a considerable number of mixture designs for fabricating precast street light posts where fiber-reinforced self-compacting concrete (FRSCC) was employed. The performance of many FRSCC mixtures was evaluated in terms of their structural properties and aesthetic characteristics. A trial-and-error procedure was performed for a series of FRSCC mixtures where silica fume, fly ash, and fibers were used. Slump flow and air conte

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Yu, Chengbing, Kaiqin Shi, Jinyan Ning, et al. "Preparation and Application of Fluorine-Free Finishing Agent with Excellent Water Repellency for Cotton Fabric." Polymers 13, no. 17 (2021): 2980. http://dx.doi.org/10.3390/polym13172980.

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Water repellent is an important functional finish for cotton fabric. However, cotton fabrics often have poor washing resistance and other performances after actual finishing. In this study, based on the structural characteristics of cotton fiber and durability of water repellent, a cross-linked amino long-chain alkyl polysiloxane (CAHPS) was first prepared, and then reacted with modified silica. Finally, a chemically bonded organic–inorganic nanohybrid cross-linked polysiloxane (rSiO2–CAHPS) was fabricated. Furthermore, the rSiO2–CAHPS was emulsified to obtain a durable fluorine-free water rep

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Al-Zahrani, Fahad Ahmed, and Md Anowar Kabir. "Ring-Core Photonic Crystal Fiber of Terahertz Orbital Angular Momentum Modes with Excellence Guiding Properties in Optical Fiber Communication." Photonics 8, no. 4 (2021): 122. http://dx.doi.org/10.3390/photonics8040122.

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The orbital angular momentum (OAM) of light is used for increasing the optical communication capacity in the mode division multiplexing (MDM) technique. A novel and simple structure of ring-core photonic crystal fiber (RC-PCF) is proposed in this paper. The ring core is doped by the Schott sulfur difluoride material and the cladding region is composed of fused silica with one layer of well-patterned air-holes. The guiding of Terahertz (THz) OAM beams with 58 OAM modes over 0.70 THz (0.20 THz–0.90 THz) frequency is supported by this proposed RC-PCF. The OAM modes are well-separated for their la

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Baselt, Tobias, Bryan Nelsen, Andrés Fabián Lasagni, and Peter Hartmann. "Supercontinuum Generation in the Cladding Modes of an Endlessly Single-Mode Fiber." Applied Sciences 9, no. 20 (2019): 4428. http://dx.doi.org/10.3390/app9204428.

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In photonic crystal fibers, light guidance can be achieved by a central defect of a periodic structure of air holes in a silica glass matrix and the dispersion can be adjusted over a wide spectral range to enhance nonlinear effects. By coupling short pulse laser radiation into the core with tight confinement and utilizing the nonlinear properties of glass, this radiation can be converted to a broad spectral distribution. The tight confinement puts limits on the maximum pulse fluence propagating in the core due to the damage threshold of the glass. Therefore, when higher power spectral densitie

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Chen, Zhuoran, Shaodi Zhang, Mengyi Ding, Mingzhi Wang, and Xing Xu. "Construction of a Phytic Acid–Silica System in Wood for Highly Efficient Flame Retardancy and Smoke Suppression." Materials 14, no. 15 (2021): 4164. http://dx.doi.org/10.3390/ma14154164.

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The intrinsic flammability of wood restricts its application in various fields. In this study, we constructed a phytic acid (PA)–silica hybrid system in wood by a vacuum-pressure impregnation process to improve its flame retardancy and smoke suppression. The system was derived from a simple mixture of PA and silica sol. Fourier transform infrared spectroscopy (FTIR) indicated an incorporation of the PA molecules into the silica network. Thermogravimetric (TG) analysis showed that the system greatly enhanced the char yield of wood from 1.5% to 32.1% (in air) and the thermal degradation rates we

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Amin, Ruhul, Lway Faisal Abdulrazak, Shaymaa R. Tahhan, et al. "Tellurite glass based optical fiber for the investigation of supercontinuum generation and nonlinear properties." Physica Scripta 97, no. 3 (2022): 030007. http://dx.doi.org/10.1088/1402-4896/ac5359.

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Abstract This manuscript introduces a unique tellurite core-based photonic crystal fiber (PCF) with silica clad and circular air holes, which manifests highly birefringent and non-linear characteristics. Several optical features, such as birefringence (Br), nonlinear coefficients (NLC), dispersion (D), confinement loss (CL), material loss, etc are thoroughly analyzed and explored by applying the finite element method (FEM). The simulated outcomes validate that by optimizing the formation of the cladding region, a large NLC of 7650 W − 1 Km − 1 , as well as an ultra-high Br of 11.2810 − 2 and z

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Budykina, T. A., and E. B. Anosova. "Study of the Behavior of the Fire-Retardant Seals Under Thermal Exposure." Occupational Safety in Industry, no. 8 (August 2021): 52–57. http://dx.doi.org/10.24000/0409-2961-2021-8-52-57.

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The results are presented concerning the experimental studies of the behavior of fire-retardant seals produced by the Ogneza group of companies under thermal exposure up to 1000 °C, obtained by the method of synchronous thermal analysis (thermogravimetry together with the differential scanning calorimetry). Incombustible properties of the M-СORE (NG) seal were confirmed, which showed a decrease in the mass of the material when heated to 1000 °C by 11%, which is due to the mineral composition of the sample (a silica-based material). High thermal stability was shown by the fire-fighting seal M-C

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Pereira, Tiago Augusto Rodrigues, Tuane Santos de Oliveira, Luzimar Campos da Silva, and Aristéa Alves Azevedo. "Comparative leaf anatomy of four species of Bromelioideae (Bromeliaceae) occurring in the Atlantic Forest, Brazil." Botany 89, no. 4 (2011): 243–53. http://dx.doi.org/10.1139/b11-011.

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Bromeliaceae, comprising 3172 species, is one of the most important families of the Brazilian Atlantic Forest owing to its high degree of endemism and occurrence in different habitats. The subfamily Bromelioideae is the most representative of Bromeliaceae and the best represented in the state of Minas Gerais, Brazil, with 120 species. The objective of this study is to compare the leaf anatomy of four species found in two areas of the Atlantic Forest: Serra do Brigadeiro State Park, Minas Gerais, Brazil ( Quesnelia strobilispica Wawra and Wittrockia gigantea (Baker) Leme) and a forest fragment

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A., Kobelev, Naganovsky Yu., Kruglov E., and Aseeva R. "PHYSICOCHEMICAL CHANGES OF HYBRID POLYURETHANE INORGANIC THERMAL INSULATION WHEN HEATING IN AIR AND IN AN INERT ATMOSPHERE." Fire and emergencies: prevention, elimination 4 (2021): 22–29. http://dx.doi.org/10.25257/fe.2021.4.22-29.

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Purpose. The article presents the results of a study of physicochemical processes occurring when a hybrid polyurethane inorganic thermal insulation is heated under dynamic conditions up to 800 °C in different atmospheric environments. The object of the study was an industrial sample of thermal insulation “FoamTech 1 550” made in South Korea. Methods. In the course of the work thermo-gravimetric analysis and IR-Fourier spectrometry were used. Samples for spectrometric analysis were prepared in the process of thermogravimetric tests by suspending the experiment. Findings. As the result of the co

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Sun, Yu, and Yuguo Sun. "Strong and Thermostable Boron-Containing Phenolic Resin-Derived Carbon Modified Three-Dimensional Needled Carbon Fiber Reinforced Silicon Oxycarbide Composites with Tunable High-Performance Microwave Absorption Properties." Applied Sciences 10, no. 6 (2020): 1924. http://dx.doi.org/10.3390/app10061924.

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This paper focuses on the preparation of boron-containing phenolic resin (BPR)-derived carbon modified three-dimensional (3D) needled carbon fiber reinforced silicon oxycarbide (SiOC) composites through a simple precursor infiltration and pyrolysis process (PIP), and the influence of PIP cycle numbers on the microstructure, mechanical, high-temperature oxidation resistance. The electromagnetic wave (EMW) absorption properties of the composites were investigated for the first time. The pyrolysis temperature played an important role in the structural evolution of the SiOC precursor, as temperatu

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Giustetto, Roberto, Loredana Macaluso, Gloria Berlier, Yadolah Ganjkhanlou, and Luca Barale. "Characterisation and possible hazard of an atypical asbestiform sepiolite associated with aliphatic hydrocarbons from Sassello, Ligurian Apennines, Italy." Mineralogical Magazine 83, no. 02 (2018): 209–22. http://dx.doi.org/10.1180/mgm.2018.159.

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AbstractAn unusual occurrence of asbestiform sepiolite, filling veins in the antigorite serpentinites of the Voltri Unit exposed in a borrow pit (now reclaimed) in the Deiva forest, near Sassello, NW Italy, was investigated with an in-depth analytical approach aimed at studying its crystal-chemistry and structure and evaluating its possible hazards for human health. Optical microscopy and scanning electron microscopy (energy-dispersive spectroscopy mode) proved that these sepiolite fibres, apparently up to several cm long, are made up of bundles of thinner fibrils (or laths: average length &am

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Hasegawa, Takemi, Eisuke Sasaoka, Masashi Onishi, Masayuki Nishimura, Yasuhide Tsuji, and Masanori Koshiba. "Hole-Assisted Lightguide Fiber - A Practical Derivative of Photonic Crystal Fiber." MRS Proceedings 722 (2002). http://dx.doi.org/10.1557/proc-722-l4.2.

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AbstractUsage of air holes in optical fibers has become a hot subject in fiber optics because of the possibilities for novel transmission properties. Although photonic crystal fibers based on photonic bandgap guidance are the most drastic innovation in this subject, optical fibers containing air holes but not having photonic crystal structures are also being intensively studied. Such air-silica microstructured fibers are more practical than the photonic bandgap fibers because the lack of photonic crystal structure makes the fabrication far easier. Even without the photonic bandgap, the microst

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Mondal, Kajal. "Structural dependence of transmission characteristics for photonic crystal fiber with circularly distributed air-holes." Journal of Optical Communications, June 8, 2020. http://dx.doi.org/10.1515/joc-2020-0032.

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AbstractIn this study, design and transmission characteristics of a special type of photonic crystal fiber (PCF) geometry namely, circular-lattice photonic crystal fiber (C-PCF) structure are presented. The cladding of the structure consists by a cylindrically symmetrical distribution of air-holes in the silica background and the core is created by omitting one air-hole at the center. The structure provides high degree of flexibility in the fiber design and hence tailorable modal properties. Structural dependence of transmission characteristics of the geometry is numerically investigated by us

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Amiri, IS, Ahmed Nabih Zaki Rashed, Kaushik Sarker, Bikash Kumar Paul, and Kawsar Ahmed. "Chirped Large Mode Area Photonic Crystal Modal Fibers and its Resonance Modes Based on Finite Element Technique." Journal of Optical Communications, July 23, 2019. http://dx.doi.org/10.1515/joc-2019-0146.

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AbstractThe study has outlined the finite element technique used for the fiber modal analysis of photonic crystal fiber (PCF) structure with a hexagonal/circular air holes arrangement on the cladding of pure fiber-optic silica. The used fibers that are namely highly nonlinear fiber (HNLF), single model silica fiber (SMSF) are combined with PCFs with different dopants concentration. Leakage loss, number of guided resonant modes, fiber birefringence, effective refractive index and cross-section areas and nonlinear coefficient parameters are measured inaccurate estimation. The optimum resonant gu

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Sutrsino, Himawan Hadi. "The Active Fire Protection Prototype for Household-Scale Kitchen Based on Silica Gel from Rice Husk Ash." International Journal of Integrated Engineering 14, no. 3 (2022). http://dx.doi.org/10.30880/ijie.2022.14.03.005.

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This study aims to create a fire protection design in the kitchen with technology that is easily applied along with inexpensive extinguishing media using silica gel from rice husk ash. By using an experimental method, the active design of fire protection in the kitchen area uses compartmentalization equipped with a gas stove, kitchen equipment, as well as specially designed fire equipment components. The composition of the air in the compartment is calculated based on the volume of the compartment so that it can represent the coverage of oxygen and fuel in accordance with the conditions of fre

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Sakr, Hesham, Yong Chen, Gregory T. Jasion, et al. "Hollow core optical fibres with comparable attenuation to silica fibres between 600 and 1100 nm." Nature Communications 11, no. 1 (2020). http://dx.doi.org/10.1038/s41467-020-19910-7.

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AbstractFor over 50 years, pure or doped silica glass optical fibres have been an unrivalled platform for the transmission of laser light and optical data at wavelengths from the visible to the near infra-red. Rayleigh scattering, arising from frozen-in density fluctuations in the glass, fundamentally limits the minimum attenuation of these fibres and hence restricts their application, especially at shorter wavelengths. Guiding light in hollow (air) core fibres offers a potential way to overcome this insurmountable attenuation limit set by the glass’s scattering, but requires reduction of all

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Roldán-Varona, Pablo, Rosa Ana Pérez-Herrera, Luis Rodríguez-Cobo, Luis Reyes-González, Manuel López-Amo, and José Miguel López-Higuera. "Liquid level sensor based on dynamic Fabry–Perot interferometers in processed capillary fiber." Scientific Reports 11, no. 1 (2021). http://dx.doi.org/10.1038/s41598-021-82193-5.

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AbstractIn this work, a novel optical fiber sensor capable of measuring both the liquid level and its refractive index is designed, manufactured and demonstrated through simulations and experimentally. For this, a silica capillary hollow-core fiber is used. The fiber, with a sensing length of 1.55 mm, has been processed with a femtosecond laser, so that it incorporates four holes in its structure. In this way, the liquid enters the air core, and it is possible to perform the sensing through the Fabry–Perot cavities that the liquid generates. The detection mode is in reflection. With a resoluti

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Altay, Pelin. "The effect of silica aerogel on thermal and sound absorption insulation properties of epoxy plate and glass fiber fabric epoxy composite." Journal of Elastomers & Plastics, December 21, 2022, 009524432211470. http://dx.doi.org/10.1177/00952443221147041.

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Silica aerogel (SA) is used as an additive in composite production to improve their thermal–mechanical properties, owing to their excellent properties such as high porosity, low density, and low thermal conductivity. All these unique properties make it attractive to be used for improving sound absorption and thermal insulation properties of composite materials. However, there are very limited studies on both improvement of sound and thermal insulation properties of glass fiber fabric epoxy composite by adding silica aerogel. With this aim, this study investigates the effect of incorporation of

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Lægsgaard, J., S. E. Barkou Libori, K. Hougaard, et al. "Dispersion Properties of Photonic Crystal Fibers - Issues and Opportunities." MRS Proceedings 797 (2003). http://dx.doi.org/10.1557/proc-797-w7.1.

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ABSTRACTThe dispersion, which expresses the variation with wavelength of the guided-mode group velocity, is one of the most important properties of optical fibers. Photonic crystal fibers (PCFs) offer much larger flexibility than conventional fibers with respect to tailoring of the dispersion curve. This is partly due to the large refractive-index contrast available in silica/air microstructures, and partly due to the possibility of making complex refractive-index structures over the fiber cross section. We discuss the fundamental physical mechanisms determining the dispersion properties of PC

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Dong, Qian, Hyungdae Bae, Zhijian Zhang, et al. "Miniature Fiber Optic Acoustic Pressure Sensors With Air-Backed Graphene Diaphragms." Journal of Vibration and Acoustics 141, no. 4 (2019). http://dx.doi.org/10.1115/1.4042929.

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Graphene has been known to possess exceptional mechanical properties, including its extremely high Young’s modulus and atomic layer thickness. Although there are several reported fiber optic pressure sensors using graphene film, a key question that is not well understood is how the suspended graphene film interacts with the backing air cavity and affects the sensor performance. Based on our previous analytical model, we will show that the sensor performance suffers due to the significantly reduced mechanical sensitivity by the backing cavity. To remedy this limitation, we will, through experim

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Harrat, Assia Ahlem, Mohammed Debbal, and Mohammed Chamse-Eddine Ouadah. "1 × 2 power splitter based on photonics crystals fibers." Journal of Optical Communications, January 30, 2023. http://dx.doi.org/10.1515/joc-2022-0273.

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Abstract In this regard, we directed a theoretical study with numerical simulations. This study allowed us to illustrate how a photonic crystal fiber (PCF) structure could divide an optical signal. One of the most fundamental components used to construct photonic integrated circuits (PIC) is the splitter, which is using light coupling between the cores as a control until the output ports by using pure silica to replace some air-hole zones along the PCF axis and split the single signal on two ports with almost equal intensity in each port. Optical interconnects are one of the most basic compone

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Skutnik, Bolesh J., and M. R. Trumbull. "Strength and Fatigue of Modified Sol-Gel Clad Optical Fibers." MRS Proceedings 531 (1998). http://dx.doi.org/10.1557/proc-531-169.

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AbstractDynamic and static fatigue results are presented for the first time for a new type of optical fiber, whose modified sol-gel cladding is a fenestrated (micro porous) form of silica. Unjacketed fibers have mean Weibull strengths in bending of 6.5 to 7.6 GPa with Weibull slopes in the 40 to 60 range. The strength decrease with decreasing strain rate is similar for both jacketed and unjacketed fibers. Even the unjacketed fibers tested in ambient water or in boiling water retain a majority of their mean strength, 7.6 GPa (ambient air) versus 6.5 GPa (ambient water) versus 5.5 GPa (boiling w

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Singh, Maninder, Babita Saini, and H. D. Chalak. "Influence of Stone Processing Waste on Mechanical, Durability, and Ecological Performance of Hybrid Fiber-Reinforced Engineered Cementitious Composite." Transportation Research Record: Journal of the Transportation Research Board, November 9, 2022, 036119812211300. http://dx.doi.org/10.1177/03611981221130027.

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The current study is focused on the characteristics of sustainable engineered cementitious composites (ECCs) with the inclusion of various types of fibers (PVA, PET, and MSE) in hybridization, silica sand (SS), river sand (RS), and stone processing waste (SPW). SPW is termed as hazardous material because of the presence of finer particles and inorganic substances which contribute to leaching problems, and cause adverse effects on aquatic life and human health. The objective of this study was to introduce new kind of cost-effective, sustainable, and greener ECC to encourage its use in diversifi

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Punde, Shirish S., and Bruce J. Tatarchuk. "Microfibrous Entrapped Catalysts for Low Temperature CO Oxidation." MRS Proceedings 1217 (2009). http://dx.doi.org/10.1557/proc-1217-y03-29.

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AbstractLow temperature CO oxidation is characterized by slow reaction kinetics and CO self-poisoning of the catalyst, which compete with each other. A platinum catalyst with ceria as a promoter supported on a high surface area silica support has been developed. The catalyst has a significant activity for CO oxidation even in the presence of moisture. The catalyst showed a significant increase in activity with decreasing particle size (η<0.95, even at 100μm), indicating a clear transport limitation.In case of larger catalyst particles the diffusional resistances affect the reaction kinetics

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