scholarly journals Microcautery based on zinc metallic nanoparticles photodeposited on the core of an optical fiber

2017 ◽  
Vol 392 ◽  
pp. 492-497 ◽  
Author(s):  
P. Zaca-Morán ◽  
C.F. Pastelín ◽  
C. Morán ◽  
G.F. Pérez-Sánchez ◽  
F. Chávez
Keyword(s):  
Optical Fiber ◽  
Metallic Nanoparticles ◽  
The Core

Optical nano-textile sensors based on the incorporation of semiconducting and metallic nanoparticles into optical fibers

2006 ◽  
Vol 920 ◽  
Author(s):  
Anuj Dhawan ◽  
John F. Muth ◽  
Dennis J. Kekas ◽  
Tushar K. Ghosh
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Metallic Nanoparticles ◽  
Protective Layer ◽  
Woven Fabrics ◽  
Continuous Fiber ◽  
The Core ◽  
Fabry Perot ◽  
Textile Sensors ◽  
Nonwoven Textiles

AbstractBy incorporating optical fiber based devices into woven and non-woven fabrics, one can distribute these devices across large areas. In this work, novel fiber optic devices with nanofunctionality are developed by incorporating metallic and semiconducting films and nanoparticles inside the optical fibers. This is accomplished by first depositing the material of interest on the tip of the optical fiber, then overcoating the fiber with a protective layer of silicon dioxide before fusing this structure to an optical fiber. This results in a continuous fiber that can be woven, or placed into nonwoven textiles. In this study the incorporation of gold nanoparticles and vanadium oxide compounds into the core of optical fibers and an in-line Fabry-Perot sensor using these techniques are described.

Fabrication of Optical Fiber Sensors Based on Femtosecond Laser Micro Machining

2020 ◽  
Vol 8 (4) ◽  
Author(s):  
Fengfeng Zhou ◽  
Seunghwan Jo ◽  
Xingyu Fu ◽  
Jung-Ting Tsai ◽  
Martin Byung-Guk Jun
Keyword(s):  
Refractive Index ◽  
Femtosecond Laser ◽  
Optical Fiber ◽  
Refractive Index Change ◽  
Optical Fiber Sensors ◽  
Objective Lens ◽  
Machining Parameters ◽  
Fiber Sensors ◽  
The Core ◽  
First Time

Abstract In this research, we proposed fabrication process of optical fiber sensors using femtosecond laser and their applications. A beam of femtosecond laser was focused by an objective lens in the optical fiber. By testing different conditions, a group of machining parameters was found that achieve a minimum machining resolution of 3.2 μm. To ablate the core of the optical fiber, which is buried deep inside the cladding, precisely, part of the cladding was removed to expose the core as close as possible to the air. By making a complex pattern to modify the optical path of the laser inside an optical fiber, a sensitivity of 942.8–1015.6 nm per refractive index unit (nm/RIU) was obtained for liquid refractive index sensing. For another sensor, a sensitivity of 1.38 × 105 nm/RIU was obtained, which is high enough to detect small amount of refractive index change of air. It is known to be the first time that we fabricated a complex microstructure in an optical fiber to modify the propagation of the light using femtosecond laser. This research shows the possibility of a complex modification of light in an optical fiber using laser machining.

Saturable absorption of SWCNTs photodeposited onto the core of an optical fiber

2014 ◽  
Author(s):  
P. Zaca-Morán ◽  
F. Chávez ◽  
G. F. Pérez-Sánchez ◽  
L. C. Gómez-Pavón ◽  
J. G. Ortega-Mendoza
Keyword(s):  
Optical Fiber ◽  
Saturable Absorption ◽  
The Core

Analysis of Transmission Characteristic in Single Polarization Dual Elliptical Assistant Holes Hollow Fiber

2013 ◽  
Vol 475-476 ◽  
pp. 1359-1362 ◽  
Author(s):  
Ding Jie Xu ◽  
Hong Ru Song ◽  
Wei Wang
Keyword(s):  
Optical Fiber ◽  
Hollow Fiber ◽  
Core Loss ◽  
Single Mode ◽  
Confinement Loss ◽  
Power Ratio ◽  
The Novel ◽  
The Core ◽  
Single Polarization ◽  
Crystal Fibers

To improve the propagation quality in photonic crystal fibers,a novel dual elliptical assistant holes hollow fiber is proposed. Numerical model of confinement loss has been modeled by vector finite element method, then the core loss characteristics and the power ratio of the hollow fiber has been simulated and analyzed. The results show that the x-polarization confinement loss and the core power ratio are 0.06dB/m and 98.2% at 1550nm, respectively. By contrast, the y-polarization confinement loss is up to 243.34dB/m while the core power ratio is 47.86%. The novel optical fiber exhibits good single polarization characteristics and transmission characteristics, and the bandwidth range of single mode single polarization is 55nm. The novel optical fiber is very good to satisfy the requirement of single mode single polarization at the 1550nm.

Internal structuring of silica glass fibers: Requirements for scattered light applicators for the usability in medicine

2016 ◽  
Vol 5 (1) ◽  
Author(s):  
Jenny Köcher ◽  
Verena Knappe ◽  
Manuela Schwagmeier
Keyword(s):  
Optical Fiber ◽  
Glass Fibers ◽  
Scattered Light ◽  
The Core ◽  
Processing Power ◽  
Silica Fibers ◽  
Bending Radius ◽  
Photon Process ◽  
Fixation Apparatus ◽  
Radiation Profile

AbstractBackground:Diffuser fibers have been used for some time in the fields of laser-induced thermotherapy and photodynamic therapy. For their applicability the breaking strength, the thermostability and a homogeneous radiation profile are of great importance. Flexible applicators offer special benefits because they introduce a totally new range of application possibilities.Objective:The aim of the presented investigations was to develop a totally new flexible diffuser fiber generation which can be produced cheaper and without the use of any further materials. For this purpose it was proposed to induce scattering micro dots directly into silica fibers by generating a local change of the refractive index in the core of the optical fiber. The resulting diffuser was expected to create a homogeneous radiation profile containing at least 80% of the light coupled into the optical fiber, i.e. less than 20% prograde (forward) emission.Materials and methods:On the basis of former research results, scattering micro dots were induced linearly into the core of an optical silica fiber through a multiple photon process using a femtosecond laser. In addition to the macroscopic optical control by means of a microscope, the form of the radiation profile was examined as well as the non-scattered forward emission which depends on a variety of influencing factors. The processing was optimized according to the observations made. The thermostability of the developed prototypes was assessed by using a thermocamera, and the minimal bending radius was determined. Finally the prototypes were tested and validatedResults:An influence of the processing power, the number and radial position of the scattering micro dots as well as the therapeutic coupled-in wavelength onto the form of the radiation profile and the non-scattered forward emission was determined. Both the form of the radiation profile and the prograde emission were found to be independent of the therapeutic laser power coupled into the fiber. The developed prototype had a nearly homogeneous radiation profile, a forward emission of 12.8±2.1% in average, and a minimum bending radius of 31±6 mm.Conclusion:The non-scattered forward emission of the developed diffusers was within the objective of below 20% and the radiation profile was very nearly homogeneous. In order to improve the reproducibility of the production process, an improved fixation apparatus needs to be developed.

scholarly journals All Fiber Mach–Zehnder Interferometer Based on Intracavity Micro-Waveguide for a Magnetic Field Sensor

2021 ◽  
Vol 11 (23) ◽  
pp. 11569
Author(s):  
Maoqing Chen ◽  
Qifeng Liu ◽  
Yong Zhao
Keyword(s):  
Magnetic Field ◽  
Optical Fiber ◽  
Magnetic Fluid ◽  
Light Transmission ◽  
Magnetic Field Sensor ◽  
Magnetic Field Measurement ◽  
Term Operation ◽  
The Core ◽  
Field Sensor ◽  
Air Hole

A magnetic fluid (MF)-based magnetic field sensor with a filling-splicing fiber structure is proposed. The sensor realizes Mach–Zehnder interference by an optical fiber cascade structure consisting of single mode fiber (SMF), multimode fiber (MMF), and single-hole-dual-core fiber (SHDCF). The core in the cladding and the core in the air hole of SHDCF are used as the reference and sensing light path, respectively, and the air hole of SHDCF is filled with magnetic fluid to realize magnetic field measurement based on magnetic controlled refractive index (RI) characteristics. The theoretical feasibility of the proposed sensing structure is verified by Rsoft simulation, the optimized length of SHDCF is determined by optical fiber light transmission experiment, and the SHDCFs are well fused without collapse through the special parameter setting. The results show that the sensitivity of the sensor is −116.1 pm/Gs under a magnetic field of 0~200 Gs with a good long-term operation stability. The proposed sensor has the advantages of high stability, fast response, simple structure, and low cost, which has development potential in the field of miniaturized magnetic field sensing.

scholarly journals Generating micropatterns onto the core of an optical fiber end with nanoparticles using fiber modes

2019 ◽  
Vol 16 (4) ◽  
pp. 045105
Author(s):  
J G Ortega-Mendoza ◽  
P Soto-López ◽  
P Zaca-Morán ◽  
A Padilla-Vivanco ◽  
J P Padilla-Martinez ◽  
...  
Keyword(s):  
Optical Fiber ◽  
The Core ◽  
Fiber Modes

scholarly journals Multi-Energy X-Ray Tomography of an Optical Fiber: The Role of Spatial Averaging

2019 ◽  
Vol 25 (1) ◽  
pp. 70-76
Author(s):  
Zachary H. Levine ◽  
Adele P. Peskin ◽  
Edward J. Garboczi ◽  
Andrew D. Holmgren
Keyword(s):  
Optical Fiber ◽  
Singular Vector ◽  
Dimensional Space ◽  
Radial Distance ◽  
Two Dimensional ◽  
X Ray ◽  
Singular Vectors ◽  
Graded Index ◽  
The Core ◽  
Peak Value

AbstractUsing a commercial X-ray tomography instrument, we have obtained reconstructions of a graded-index optical fiber with voxels of edge length 1.05 µm at 12 tube voltages. The fiber manufacturer created a graded index in the central region by varying the germanium concentration from a peak value in the center of the core to a very small value at the core-cladding boundary. Operating on 12 tube voltages, we show by a singular value decomposition that there are only two singular vectors with significant weight. Physically, this means scans beyond two tube voltages contain largely redundant information. We concentrate on an analysis of the images associated with these two singular vectors. The first singular vector is dominant and images of the coefficients of the first singular vector at each voxel look are similar to any of the single-energy reconstructions. Images of the coefficients of the second singular vector by itself appear to be noise. However, by averaging the reconstructed voxels in each of several narrow bands of radii, we can obtain values of the second singular vector at each radius. In the core region, where we expect the germanium doping to go from a peak value at the fiber center to zero at the core-cladding boundary, we find that a plot of the two coefficients of the singular vectors forms a line in the two-dimensional space consistent with the dopant decreasing linearly with radial distance from the core center. The coating, made of a polymer rather than silica, is not on this line indicating that the two-dimensional results are sensitive not only to the density but also to the elemental composition.

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