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Silica Fibers (silica + fiber)

Distribution by Scientific Domains
Polymers and Materials Science23%
Physics and Astronomy15%

Selected Abstracts

Genetically Modifiable Flagella as Templates for Silica Fibers: From Hybrid Nanotubes to 1D Periodic Nanohole Arrays

ADVANCED FUNCTIONAL MATERIALS, Issue 21 2009
Fuke Wang
No abstract is available for this article. [source]

Hybrid germanium/silica optical fibers for endoscopic delivery of erbium:YAG laser radiation

LASERS IN SURGERY AND MEDICINE, Issue 1 2004
Charles A. Chaney MS
Abstract Background and Objectives Endoscopic applications of the erbium (Er):YAG laser have been limited due to the lack of an optical fiber delivery system that is robust, flexible, and biocompatible. This study reports the testing of a hybrid germanium/silica fiber capable of delivering Er:YAG laser radiation through a flexible endoscope. Study Design/Materials and Methods Hybrid optical fibers were assembled from 1-cm length, 550-,m core, silica fiber tips attached to either 350- or 425-,m germanium oxide "trunk" fibers. Er:YAG laser radiation (,,=,2.94 ,m) with laser pulse lengths of 70 and 220 microseconds, pulse repetition rates of 3,10 Hz, and laser output energies of up to 300 mJ was delivered through the fibers for testing. Results Maximum fiber output energies measured 180±30 and 82±20 mJ (n,=,10) under straight and tight bending configurations, respectively, before fiber interface damage occurred. By comparison, the damage threshold for the germanium fibers without silica tips during contact soft tissue ablation was only 9 mJ (n,=,3). Studies using the hybrid fibers for lithotripsy also resulted in fiber damage thresholds (55,114 mJ) above the stone ablation threshold (15,23 mJ). Conclusions Hybrid germanium/silica fibers represent a robust, flexible, and biocompatible method of delivering Er:YAG laser radiation during contact soft tissue ablation. However, significant improvement in the hybrid fibers will be necessary before they can be used for efficient Er:YAG laser lithotripsy. Lasers Surg. Med. 34:5,11, 2004. © 2004 Wiley-Liss, Inc. [source]

Comparison of germanium oxide fibers with silica and sapphire fiber tips for transmission of erbium: YAG laser radiation

LASERS IN SURGERY AND MEDICINE, Issue 8 2006
Travis J. Polletto BS
Abstract Background and Objectives Endoscopic applications of the Erbium:YAG laser have been limited due to the lack of a suitable optical fiber delivery system. The purpose of this study was to compare the transmission of Er:YAG laser radiation through germanium oxide trunk fibers with silica and sapphire fiber tips for potential use in contact tissue ablation during endoscopy. Study Design/Materials and Methods Er:YAG laser radiation with a wavelength of 2.94 µm, pulse length of 300 microseconds, pulse energies from 5 to 1,360 mJ, coupled into pulse repetition rates of 3,10 Hz, was through 1-m-long germanium oxide fibers with either 1-cm-long, 550-µm-diameter silica or sapphire tips. Results Transmission through the germanium oxide/sapphire fibers measured 65±5% compared with 55±4% for the germanium oxide/silica fibers (P<0.05). The damage threshold for the hybrid fibers averaged 309± 44 mJ and 126±43 mJ, respectively (n,=,7 fibers each) (P<0.05). The highest pulse energies transmitted through the fibers were 700 mJ and 220 mJ, respectively. Conclusions Improved index-matching of the trunk fiber and fiber tip at 2.94 µm resulted in higher transmission and damage thresholds for the germanium oxide/sapphire fibers. The germanium oxide/sapphire fiber may represent a promising mid-infrared optical fiber delivery system for use in endoscopic applications of the Er:YAG laser requiring a flexible, biocompatible, and robust fiber delivery system for contact tissue ablation. Lasers Surg. Med. 38:787,791, 2006. © 2006 Wiley-Liss, Inc. [source]

Reconfigurable photonic crystal circuits

LASER & PHOTONICS REVIEWS, Issue 2 2010
C. Grillet
Abstract We describe progress in the field of tuning, (re)configuration of Photonic crystal (PhC) based devices with a particular emphasis on our recent concepts and techniques that we have developed to tune and/or reconfigure the properties of photonic crystal nanocavities. We show how our hybrid approach based on photosensitive material and tapered silica fiber can tune the (Q, ,) properties of preexisting Photonic crystal cavities. We describe our alternative techniques to create ,a posteriori' spatially (re)configurable high-Q cavities in a PhC platform. We show that optofluidics , the fusion of microfluidics with photonic devices , offers an unquestionable added value to the quest of a truly versatile, (re)configurable photonic crystal based photonic chip. [source]

Near-IR-to-visible emission in ytterbium-doped silica fiber at in-core 488-nm pumping

LASER PHYSICS LETTERS, Issue 12 2008
A.V. Kir'yanov
Abstract We report near-IR-to-visible broadband emission in Ytterbium-doped silicate fiber (YF) at 488-nm in-core excitation. This emission is revealed to originate from Yb3+ -Yb3+ pair clusters (900 , 1200-nm band), whose presence is proved by a separate study of cooperative processes in the fiber, and Yb2+ phototropic centers (600 , 900-nm band) provisionally accepted to be present in the YF. (© 2008 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source]

Liquid level sensor using etched silica fiber

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2010
J. Linesh
Abstract An all optical fiber, intensity modulated sensor for discrete liquid level sensing is presented. The highly sensitive and robust design requires only silica fibers, an optical source and a detector. The sensor probe is prepared by etching the silica fibers using hydrofluoric acid. Experiments conducted with water confirm the ability of the sensor to detect liquid level variation below 10 ,m. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:883,886, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25037 [source]

Electrochemical preparation of composite polyaniline coating and its application in the determination of bisphenol A, 4- n -nonylphenol, 4- tert -octylphenol using direct solid phase microextraction coupled with high performance liquid chromatography

JOURNAL OF SEPARATION SCIENCE, JSS, Issue 16 2005
Minjia Huang
Abstract For SPME-HPLC, metal wires with better mechanical strength are preferred over the fused silica fibers. In this article, a novel composite polyaniline (CPANI) doped with PEG and polydimethylsiloxane coating (CPANI fiber) was prepared on a stainless steel wire by a three-electrode system: the fiber was used as the work electrode, a calomel electrode and a platinum electrode were used as the reference and the counter electrodes, respectively. To evaluate the new CPANI coating, the coating was used to extract three kinds of phenols (bisphenol A, 4- n -nonylphenol, and 4- tert -octylphenol) in water samples by direct-SPME mode and then desorbed in commercial SPME-HPLC interface to separation. The extraction procedure was also optimized. Five real water samples were investigated. Good recoveries were gained when environmental samples were analyzed. [source]

Status and dreams of photonics polymer for IT

MACROMOLECULAR SYMPOSIA, Issue 1 2003
Yasuhiro Koike
Abstract We have proposed a low-loss, high-bandwidth and large-core graded-index plastic optical fiber (GI POF) in data-corn, area. The GI POF enables us to eliminate the "modal noise" problem which is observed in medium-core silica fibers. Therefore, stable high-speed data transmission can be realized by the GI POF rather than medium-core silica fibers. Furthermore, advent of perfluorinated (PF) polymer based GI POF network can support higher transmission than silica fibers network because of the small material dispersion of PF polymer compared with silica. In addition, we proposed a "highly scattering optical transmission (HSOT) polymer" and applied it to a light guide plate of a liquid crystal display backlight. The HSOT polymer backlight that was designed using the HSOT designing simulator demonstrated twice the brightness of the conventional taransparent backlight with sufficient color uniformity. Furthermore, we proposed the two types of zero-birefringence polymers synthesized by the random copolymerization method and the anisotropic molecule dopant method. Both of the polymers exhibited no orientational birefringence for any orientation of polymer chains. [source]

Liquid level sensor using etched silica fiber

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2010
J. Linesh
Abstract An all optical fiber, intensity modulated sensor for discrete liquid level sensing is presented. The highly sensitive and robust design requires only silica fibers, an optical source and a detector. The sensor probe is prepared by etching the silica fibers using hydrofluoric acid. Experiments conducted with water confirm the ability of the sensor to detect liquid level variation below 10 ,m. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:883,886, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25037 [source]

Investigation on the interplay between dispersion and nonlinearity in subwavelength-diameter silica fibers

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 8 2008
Juan Juan Hu
Abstract A theoretical study of optical properties of subwavelength-diameter silica fibers is presented, with an emphasis on the interplay between dispersion and nonlinearity. The normalized dispersion and effective nonlinearity are used to analyze the diameter-dependent relative strength at all wavelengths. The dispersion and nonlinearity length are calculated for guiding waveguide dimension design for possible applications. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2086,2090, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23552 [source]