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Daniel Sullivan, Chul Ahn, Ang Gao, Chantale Lacelle, Fernando Torres, Srinivas Bollineni, Amit Banga, Jessica Mullins, Manish Mohanka, Steve Ring, Michael Wait, Matthias Peltz, Pavan Duddupudi, Dhiraj Surapaneni, Vaidehi Kaza
BACKGROUND: Although, presence of donor specific antibodies (DSA) is known to impact lung allograft, limited data exists regarding DSA management. METHODS: We did a retrospective study at our center evaluating DSA management in adult lung transplant recipients undergoing lung transplantation between January 1, 2010 and June 30, 2014. Study follow up was completed through October 2017. All recipients were stratified into two groups based on the presence or absence of DSA...
May 17, 2018: Clinical Transplantation
Hai-Hui Zhang, Yao-Ping Xie, Mei-Yi Yao, Jing-Xiang Xu, Jin-Long Zhang, Li-Juan Hu
The anisotropy of metal oxidation is a fundamental issue, and the oxidation of Zr surfaces also attracts much attention due to the application of Zr alloys as cladding materials for nuclear fuels in nuclear power plants. In this study, we systematically investigate the diagram of O adsorption on low Miller index Zr surfaces by using first-principles calculations based on density functional theory calculations. We find that O adsorption on the basal surface, Zr(0001), is more favourable than that on the prism surfaces, Zr(112[combining macron]0) and Zr(101[combining macron]0), under strong O-reducing conditions, while O adsorption on the prism surface is more favourable than that of the basal surface under weak O-reducing conditions and the O-rich conditions...
May 18, 2018: Physical Chemistry Chemical Physics: PCCP
Lucas Küppers, Olaf Holz, Sven Schuchardt, Jens Gottlieb, Jan Fuge, Mark Greer, Jens Hohlfeld
Chronic lung allograft dysfunction (CLAD) with its clinical correlative of bronchiolitis obliterans syndrome (BOS) remains the major limiting factor for long-term graft survival. Currently there are no established methods for the early diagnosis or prediction of BOS. To assess the feasibility of breath collection as a non-invasive tool and the potential of breath volatile organic compounds (VOC) for the early detection of BOS, we compared the breath VOC composition between transplant patients without and different stages of BOS...
May 17, 2018: Journal of Breath Research
Qinjiang Fu, Jingdong Zhang, Chuancan Liang, Iroegbu Paul Ikechukwu, Guolu Yin, Lei Lu, Yifan Shao, Liu Liu, Dongxiao Liu, Tao Zhu
In this Letter, we demonstrated an intensity-modulated directional torsion sensor based on an in-line Mach-Zehnder interferometer in single-mode fiber. A non-circular symmetric perturbation is created to excite non-circular symmetric cladding mode and then interference with the core mode at the second perturbation. An initial rotation angle is designed between two perturbations for the purpose of discriminating the torsion direction. Both experimental and theoretical results enforce that the spectral peak/dip turns to be the dip/peak when the fiber is twisted from the counter-clockwise to the clockwise direction...
May 15, 2018: Optics Letters
Liang Tian, Fei Wang, Yuanda Wu, Yunji Yi, Xiaoqiang Sun, Daming Zhang
A polymer/silica hybrid integration add-drop filter based on a grating-assisted contradirectional coupler fabricated through simple and low-cost contact lithography is proposed. First, the structure pattern of the add-drop filter was formed in the lower silica cladding by contact lithography and inductively coupled plasma (ICP) etching. Then an SU-8 film was fabricated on top of it by a spin-coating method, and an inverted-rib waveguide structure was formed. Next, the slab layer of the inverted-rib waveguide was removed by ICP etching...
May 15, 2018: Optics Letters
C A Schäfer, H Uehara, D Konishi, S Hattori, H Matsukuma, M Murakami, S Shimizu, S Tokita
A side-pump coupler made of fluoride fibers was fabricated and tested. The tested device had a coupling efficiency of 83% and was driven with an incident pump power of up to 83.5 W, demonstrating high-power operation. Stable laser output of 15 W at a wavelength of around 2.8 μm was achieved over 1 h when using an erbium-doped double-clad fiber as the active medium. To the best of our knowledge, this is the first time a fluoride-glass-fiber-based side-pump coupler has been developed. A test with two devices demonstrated further power scalability...
May 15, 2018: Optics Letters
Álvaro González-Vila, Andreas Ioannou, Médéric Loyez, Marc Debliquy, Driss Lahem, Christophe Caucheteur
Surface plasmon resonance excitation with optical fiber gratings has been typically studied in aqueous solutions. This work describes the procedure to excite a plasmon wave in gaseous media and perform refractive index measurements in these environments. Grating photo-inscription with 193 nm excimer laser radiation allows us to obtain slightly tilted fiber Bragg gratings exhibiting a cladding mode resonance comb along several hundreds of nanometers. Their refractive index sensitive range extends from gases to liquids, so operation in both media is compared...
May 15, 2018: Optics Letters
Matthew H Govorko, Lin Fritschi, Alison Reid
In situ asbestos in the built environment is a remaining source of exposure in countries that have prohibited the manufacture and use of asbestos. However, it is difficult to identify in situ asbestos-containing material in residential settings. The objective of this study was to evaluate the accuracy of the mobile phone application ("app"), ACM Check, in identifying in situ asbestos located inside and outside of homes compared with onsite inspections conducted by an experienced environmental consultant...
May 14, 2018: Journal of Occupational and Environmental Hygiene
Jacques Albert, Fu Liu, Violeta Marquez-Cruz
Theoretical and experimental results are presented to show that the complex effective index of the modes of optical fibers coated with non-uniform metal coatings of gold, silver, copper, or palladium, with thicknesses between 0 and 20 nm, acquire a greatly enhanced sensitivity to various forms of perturbations. Thickness changes of less than 1 nm can be measured as well as the binding of record low concentrations of chemical and biochemical species.
May 11, 2018: Sensors
Daniil N Bratashov, Natalia A Burmistrova, Sergey D Bondarenko, Boris N Khlebtsov, Vsevolod S Atkin, Andrey A Shuvalov, Anastasiya A Zanishevskaya, Yulia S Skibina, Irina Y Goryacheva
A sensor based on microstructured waveguides (MWGs) with a hollow core inner surface covered with polyelectrolyte-layer-stabilized gold nanostars was developed for the SERS sensing of dissolved analytes. A polyelectrolyte-layer coating over the inner surface of glass cladding served as a spacer, reducing nonlinear optical effects in the glass near plasmonic hotspots of nanoparticles, as a stabilizing agent for thermodynamically unstable gold nanostars and as an optical coating for the fine-tuning of MWG bandgaps...
May 5, 2018: Materials
Fengyi Chen, Xueguang Qiao, Ruohui Wang, Dan Su, Qiangzhou Rong
We propose and experimentally demonstrate an orientation-dependent fiber-optic bending sensor. The sensing probe consists of a fiber Bragg grating inscribed in both the fiber core and the surrounding cladding of a section of a side-hole fiber. We utilized a side-illumination technique using a femtosecond laser to achieve the grating structure formation. The transmission intensities of both resonances are highly sensitive bending of the fiber, and the bending response shows orientation dependence. The surrounding temperature fluctuation causes a wavelength shift, but not an intensity variation...
May 1, 2018: Applied Optics
Maciej Napiorkowski, Waclaw Urbanczyk
We show that in twisted microstructured optical fibers (MOFs) the coupling between the core and cladding modes can be obtained for helix pitch much greater than previously considered. We provide an analytical model describing scaling properties of the twisted MOFs, which relates coupling conditions to dimensionless ratios between the wavelength, the lattice pitch and the helix pitch of the twisted fiber. Furthermore, we verify our model using a rigorous numerical method based on the transformation optics formalism and study its limitations...
April 30, 2018: Optics Express
Barbara Hopf, Franz J Dutz, Thomas Bosselmann, Michael Willsch, Alexander W Koch, Johannes Roths
A new iterative matrix algorithm has been applied to improve the precision of temperature and force decoupling in multi-parameter FBG sensing. For the first time, this evaluation technique allows the integration of nonlinearities in the sensor's temperature characteristic and the temperature dependence of the sensor's force sensitivity. Applied to a sensor cable consisting of two FBGs in fibers with 80 µm and 125 µm cladding diameter installed in a 7 m-long coiled PEEK capillary, this technique significantly reduced the uncertainties in friction-compensated temperature measurements...
April 30, 2018: Optics Express
W W Li, D N Wang, Z K Wang, Ben Xu
A fiber in-line Mach-Zehnder interferometer based on a pair of femtosecond laser inscribed short sections of waveguide is presented. One short waveguide directs part of the propagating light from the fiber core to the cladding-air interface, and experiences multiple total internal reflections before taking back to the fiber core by the other short waveguide. The device is robust in structure, can be fabricated in a fast way and with a flexible manner, and has the capability of ambient refractive index sensing, which makes it highly desirable for many "lab-in-fiber" applications...
April 30, 2018: Optics Express
S Al-Sumaidae, M H Bitarafan, C A Potts, J P Davis, R G DeCorby
We describe a theoretical study of dipole emitters inside buckled-dome Fabry-Perot cavities with Si/SiO2 -based omnidirectional Bragg mirrors. The low penetration depth of the mirrors contributes to low mode volumes, potentially enabling large enhancement of spontaneous emission into moderate-quality-factor cavity modes. Furthermore, the omnidirectional mirrors can significantly inhibit background emission. For a representative cavity operating in a fundamental spatial mode regime at λ ~1550 nm, and an optimally located emitter, we predict simultaneous enhancement of emission into the cavity mode by ~120 and suppression of background emission by ~25, implying the potential for a cooperativity C ~1500...
April 30, 2018: Optics Express
Jeong-Tak Oh, Sang-Youl Lee, Yong-Tae Moon, Ji Hyung Moon, Sunwoo Park, Ki Yong Hong, Ki Young Song, Chanhyoung Oh, Jong-In Shim, Hwan-Hee Jeong, June-O Song, Hiroshi Amano, Tae-Yeon Seong
We investigated the optical and electrical properties of red AlGaInP light-emitting diodes (LEDs) as functions of chip size, p-cladding layer thickness, and the number of multi-quantum wells (MQWs). External quantum efficiency (EQE) decreased with decreasing chip size. The ideality factor gradually increased from 1.47 to 1.95 as the chip size decreased from 350 μm to 15 μm. This indicates that the smaller LEDs experienced larger carrier loss due to Shockley-Read-Hall nonradiative recombination at sidewall defects...
April 30, 2018: Optics Express
Ryo Maruyama, Masaharu Ohashi, Kimitaka Watanabe, Nori Shibata, Nobuo Kuwaki, Shoichiro Matsuo
We propose a two-mode optical fiber (TMF) with a low sensitivity of differential modal group delay (DMD) to change of the core radius and the refractive index of the core in the index profile which are major factors for DMD deviation. This was done to achieve high reproducibility of fiber fabrication. The proposed TMF has a graded index (GI) core and a depressed inner cladding, and we optimize structural parameters. We fabricated different kinds of TMFs to confirm the low DMD sensitivity of our proposed fiber...
April 30, 2018: Optics Express
Zhihua Shao, Qiangzhou Rong, Fengyi Chen, Xueguang Qiao
A high-resolution fiber-optic ultrasonic sensor based on a suspended-core fiber was designed and experimentally demonstrated. The intrinsic Fabry-Perot interferometer consisting of a micro suspended-core from acid corrosion of a grapefruit fiber proved highly sensitive to a wide range of ultrasonic wave (UW) frequencies. A compact interrogation system using spectral sideband filtering was constructed for UW detection. The sensor exhibited significantly improved spatial resolution and detection sensitivity by etching the suspended-core diameter to few microns...
April 16, 2018: Optics Express
Yang Yang, Na Li, Jiaming Sun
Intense electroluminescence (EL) from Tb3+ ions in the Al2 O3 /Tb2 O3 nanolaminate films is achieved in a metal-oxide-semiconductor structure fabricated on silicon, utilizing atomic layer deposition. Precisely controlling of the nanolaminates enables the study on the influence of the atomic Tb layers and the distance between every dopant layers on the EL mechanism. The EL intensity decreases with excessive Tb dopant cycles due to the reduction of optically active Tb3+ ions. Cross-relaxation among adjacent Tb2 O3 dopant layers depopulates the excited ions in 5 D3 level and contributes to the green EL from 5 D4 level, which strongly depends on the Al2 O3 sublayer thickness with a critical value of ~3 nm...
April 2, 2018: Optics Express
Erden Ertorer, Moez Haque, Jianzhao Li, Peter R Herman
A new beam delivery method is introduced for controlling filament formation in optical fiber that enables point-by-point writing of 1st order fiber Bragg gratings (FBGs) with single femtosecond laser pulses. Uniform filament tracks with azimuthal symmetry were formed fully through the 9.3 µm core waveguide by a modified immersion focusing method to eliminate astigmatism by the cylindrical fiber shape. Filament arrays were precisely assembled inside of single-mode fiber, generating strong FBG resonances in the telecommunication band...
April 2, 2018: Optics Express
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