NONLINEAR OPTICAL PROPERTIES OF ZINC DOPED GERMANO-SILICATE GLASS OPTICAL FIBER

2010 ◽  
Vol 19 (04) ◽  
pp. 791-799 ◽  
Author(s):  
SEONGMIN JU ◽  
PRAMOD R. WATEKAR ◽  
SEONGMOOK JEONG ◽  
YOUNGWOONG KIM ◽  
WON-TAEK HAN
Keyword(s):  
Optical Fiber ◽  
Silicate Glass ◽  
Continuous Wave ◽  
Chemical Vapor ◽  
Average Diameter ◽  
Nano Particles ◽  
Modulation Method ◽  
Transmission Electron ◽  
Average Size ◽  
Metal Nano Particles

Zinc doped germano-silicate glass optical fiber was developed by using the modified chemical vapor deposition and the drawing tower process. Absorption peaks of the germano-silicate glass optical fiber preform appeared at 240 nm and 330 nm were due to the incorporated Zn metal nano-particles (MNPs) and ZnO semiconductor nano-particles (SNPs), respectively and the average diameter of nano-particles (NPs) was estimated to be about 2 nm by transmission electron microscopy. However, the absorption peak of the zinc doped optical fiber due to ZnO SNPs was found to appear at 490 nm red-shifted from 330 nm can be explained by the increase in average size of ZnO SNPs in the fiber core due to growth or recrystallization of ZnO SNPs during the fiber drawing process about 2150°C. The nonlinear refractive index coefficient, n2, of the fiber was estimated to be 5.62 × 10-20 m2/W due to the stable dispersion of ZnO SNPs using the continuous-wave self-phase modulation method.

scholarly journals Preparation and Application of Metal Nanoparticals Elaborated Fiber Sensors

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5155
Author(s):  
Jin Li ◽  
Haoru Wang ◽  
Zhi Li ◽  
Zhengcheng Su ◽  
Yue Zhu
Keyword(s):  
Optical Fiber ◽  
Ph Value ◽  
Hot Spot ◽  
Incident Light ◽  
Environmental Parameters ◽  
Optical Diffraction ◽  
Nano Particles ◽  
Physical Parameters ◽  
Compact Structure ◽  
Metal Nano Particles

In recent years, surface plasmon resonance devices (SPR, or named plamonics) have attracted much more attention because of their great prospects in breaking through the optical diffraction limit and developing new photons and sensing devices. At the same time, the combination of SPR and optical fiber promotes the development of the compact micro-probes with high-performance and the integration of fiber and planar waveguide. Different from the long-range SPR of planar metal nano-films, the local-SPR (LSPR) effect can be excited by incident light on the surface of nano-scaled metal particles, resulting in local enhanced light field, i.e., optical hot spot. Metal nano-particles-modified optical fiber LSPR sensor has high sensitivity and compact structure, which can realize the real-time monitoring of physical parameters, environmental parameters (temperature, humidity), and biochemical molecules (pH value, gas-liquid concentration, protein molecules, viruses). In this paper, both fabrication and application of the metal nano-particles modified optical fiber LSPR sensor probe are reviewed, and its future development is predicted.

Controlled Growth of Carbon Spheres by Chemical Vapor Deposition Based on Anodic Aluminum Oxide Nano-Template

2012 ◽  
Vol 184-185 ◽  
pp. 924-927
Author(s):  
Lei Shan Chen ◽  
Cun Jing Wang ◽  
Gai Rong Chen
Keyword(s):  
Electron Microscopy ◽  
Vapor Deposition ◽  
Anodic Aluminum Oxide ◽  
Chemical Vapor ◽  
Average Diameter ◽  
Carbon Spheres ◽  
Aao Template ◽  
Graphene Layers ◽  
Anodic Aluminum ◽  
Transmission Electron

The reactions were carried out by decomposing acetylene at 1000 °C in a two-stage furnace system for 10 min. In the first furnace no catalyst was placed and an AAO template with the average diameter about 50 nm was placed in the second furnace whose temperature was designed to be 500 °C, 600 °C and 700 °C. The samples were characterized by scanning electron microscopy and high resolution transmission electron microscopy. The results show that carbon spheres with average diameter about 50 nm on the AAO template surface were obtained when the temperature of the second furnace was designed to be 700 °C. These carbon spheres are composed of unclosed graphene layers with an interlayer distance of 0.33–0.35 nm between the layers.

UV Photoluminescence of Alumino-Germano-Silicate Glass Optical Fiber Incorporated with Gd2O3 Nano-Particles Upon Illumination of Xenon-Lamp

2018 ◽  
Vol 18 (3) ◽  
pp. 2006-2009 ◽  
Author(s):  
Seongmin Ju ◽  
Kadathala Linganna ◽  
Bok Hyeon Kim ◽  
Seongjae Boo ◽  
Yong Ho An ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Silicate Glass ◽  
Nano Particles ◽  
Xenon Lamp

Sintering and Dielectric Properties of Ba(Mg1/3Ta2/3)O3 Particle Prepared by Spray Pyrolysis

2008 ◽  
Vol 388 ◽  
pp. 245-248 ◽  
Author(s):  
Hiroki Yamada ◽  
Takashi Okawa ◽  
Takashi Ogihara
Keyword(s):  
Electron Microscopy ◽  
Spray Pyrolysis ◽  
Ultrasonic Spray Pyrolysis ◽  
Nano Particles ◽  
Ultrasonic Spray ◽  
Transmission Electron ◽  
Powder Particles ◽  
Average Size ◽  
Micrometer Size ◽  
20 Nm

Ba(Mg1/3Ta2/3)O3 (BMT) powders were successfully prepared by ultrasonic spray pyrolysis from an aqueous solution of Ba, Mg and Ta. The particles characteristics of BMT nano-sized powders were studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD). As-prepared powder particles had a sub-micrometer size with a narrow distribution. Transmission electron microscopy (TEM) observation revealed that the average size of the BMT nano-particles was around 20 nm, and that these particles were aggregated. The dielectric constant (r) of 23.2 and the Q・f of 98,300 were obtained at 1550°C by a spray pyrolysis.

Synthesis and room-temperature ferromagnetism of cobalt-doped SnO2 nanowires

2009 ◽  
Vol 24 (6) ◽  
pp. 2001-2005 ◽  
Author(s):  
Jin Wu ◽  
Ke Yu ◽  
Yongsheng Zhang ◽  
Lijun Li ◽  
Ziqiang Zhu
Keyword(s):  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Chemical Vapor ◽  
Average Diameter ◽  
Magnetization Measurement ◽  
Chemical Vapor Transport ◽  
Ferromagnetic Properties ◽  
Transmission Electron ◽  
Sno2 Nanowires ◽  
Ferromagnetic Hysteresis

We have observed ferromagnetism in dilute cobalt-doped SnO2 nanowires at room temperatures. The Co-doped SnO2 nanowires with an average diameter of ∼50 nm were synthesized by the thermal chemical vapor transport method. High-resolution transmission electron microscopy and energy-dispersive x-ray spectroscopy analyses demonstrate that the nanowires are single-crystal structures and Co is homogeneously doped into the SnO2 lattice. The ferromagnetic hysteresis curves and temperature-dependent magnetization measurement provide evidence for ferromagnetic properties with a Curie temperature above room temperature. Oxygen annealing has been performed to study the roles played by the oxygen vacancies in determining the ferromagnetic properties of the nanowires.

Effect of TEOS addition on formation of Au metal nano-particles in the Au-doped optical fiber and its optical nonlinearity

2010 ◽  
Vol 356 (44-49) ◽  
pp. 2578-2582 ◽  
Author(s):  
Seongmin Ju ◽  
Pramod R. Watekar ◽  
Seong Gu Kang ◽  
Jun-Ki Chung ◽  
Cheol Jin Kim ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Optical Nonlinearity ◽  
Nano Particles ◽  
Metal Nano Particles

scholarly journals Effect of the Nanoparticles on the Structure and Crystallization of Amorphous Silicon Thin Films Produced by rf Glow Discharge

1998 ◽  
Vol 13 (9) ◽  
pp. 2476-2479 ◽  
Author(s):  
E. Bertran ◽  
S. N. Sharma ◽  
G. Viera ◽  
J. Costa ◽  
P. St'ahel ◽  
...  
Keyword(s):  
Thin Films ◽  
Amorphous Silicon ◽  
Silicon Nanoparticles ◽  
Continuous Wave ◽  
Chemical Vapor ◽  
Hydrogen Gas ◽  
Electrical Measurements ◽  
Silicon Thin Films ◽  
Transmission Electron ◽  
Rf Glow Discharge

Thin films of nanostructured silicon (ns-Si:H) were deposited by plasma-enhanced chemical vapor deposition in the presence of silicon nanoparticles at 100 °C substrate temperature using a silane and hydrogen gas mixture under continuous wave (cw) plasma conditions. The nanostructure of the films has been demonstrated by diverse ways: transmission electron microscopy, Raman spectroscopy, and x-ray diffraction, which have shown the presence of ordered silicon clusters (1–2 nm) embedded in an amorphous silicon matrix. Because of the presence of these ordered domains, the films crystallize faster than standard hydrogenated amorphous silicon samples, as evidenced by electrical measurements during the thermal annealing.

Defect population and electrical properties of Ar+-laser crystallized polycrystalline silicon thin films

2000 ◽  
Vol 621 ◽  
Author(s):  
S. Christiansen ◽  
M. Nerding ◽  
C. Eder ◽  
G. Andrae ◽  
F. Falk ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Electrical Properties ◽  
Process Parameters ◽  
Continuous Wave ◽  
Chemical Vapor ◽  
Glass Substrates ◽  
Silicon Thin Films ◽  
Transmission Electron ◽  
Pressure Chemical ◽  
Convergent Beam

ABSTRACTWe crystallize amorphous silicon (a-Si) layers (thicknesses: ∼300nm and ∼1300nm for comparison) that are deposited on glass substrates (Corning 7059) by low pressure chemical vapor deposition using a continuous wave Ar+-laser. We scan the raw beam with a diameter of ∼60νm in single traces and traces with varying overlap (30-60%). With optimized process parameters (fluence, scan velocity, overlap) we achieve polycrystalline Si with grains as wide as 100νm. The grain boundary population is dominated by first and second order twin boundaries as analyzed by electron backscattering analysis in the scanning electron microscope and convergent beam electron diffraction in the transmission electron microscope. These twins are known not (or only marginally) to degrade the electrical properties of the material. In addition to twins, dislocations and twin lamellae occur at varying densities (depending on grain orientation and process parameters). The recombination activity of the defects is analyzed by EBIC and according to these measurements crystallization receipts are defined that yield the reduction of electrically detrimental defects.

Effects of composition on the microstructure of YBa2Cu3O7−x thin films prepared by plasma-enhanced metalorganic chemical vapor deposition

1992 ◽  
Vol 7 (8) ◽  
pp. 1993-2002 ◽  
Author(s):  
P. Lu ◽  
J. Zhao ◽  
C.S. Chern ◽  
Y.Q. Li ◽  
G.A. Kulesha ◽  
...  
Keyword(s):  
Thin Films ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Metalorganic Chemical Vapor Deposition ◽  
Stacking Faults ◽  
Chemical Vapor ◽  
Transmission Electron ◽  
The Matrix ◽  
Average Size ◽  
Metalorganic Chemical

The microstructures of (A) near stoichiometric, (B) Y-rich, and (C) Y- and Cu-rich YBa2Cu3O7−x thin films have been studied by high-resolution transmission electron microscopy. The films were deposited on (100) LaAlO3 by plasma-enhanced metalorganic chemical vapor deposition. In near stoichiometric films, microstructural features similar to those of thin films deposited by other techniques have been observed. These features which include epitaxial growth with the c-axis perpendicular to the substrate, twin boundaries on (110) planes, and stacking faults on (100) and (001) planes were also present in the off-stoichiometric materials. In Y-rich thin films, yttria (Y2O3) precipitates with an average size of about 5 nm have been identified in the matrix. The precipitates are uniformly distributed, have a high density as large as 1024/m3, and are highly oriented with respect to the matrix. In Y- and Cu-rich thin films, CuO particles up to 1 μm in size were observed on the surfaces of the films. The observed microstructural features were similar to those of the Y-rich materials.

The Effect of Temperature on the Structure of Cotton Carbon Fiber by Chemical Vapor Deposition

2015 ◽  
Vol 781 ◽  
pp. 671-674
Author(s):  
Jindamanee Nissayan ◽  
Saifon Kruehong ◽  
Chaiyaput Kruehong ◽  
Apichat Artnaseaw
Keyword(s):  
Chemical Vapor Deposition ◽  
Electron Microscope ◽  
Carbon Fibers ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Average Diameter ◽  
Effect Of Temperature ◽  
Synthesis Process ◽  
Transmission Electron ◽  
Different Temperatures

Synthesis of carbon fibers of cotton by chemical vapor deposition (CDV) method is the main focus of this study. Having ferocene as the catalyst, the study explored effects of synthesis process at different temperatures (750°C, 850°C and 950°C). Analysis of size, shape and structure were conducted using scanning electron microscope (SEM), transmission electron microscope (TEM) and Raman spectroscope. The result showed that average diameter of carbon fibers tended to increase according to temperature. In addition, it was found that surface of the fiber is bend and helical. Also, higher temperature affected graphitic of the fiber.

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