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https://www.readbyqxmd.com/read/28900104/geometrically-controlled-polarisation-processing-in-femtosecond-laser-written-photonic-circuits
#1
Ioannis Pitsios, Farid Samara, Giacomo Corrielli, Andrea Crespi, Roberto Osellame
Polarisation of light is a powerful and widely used degree of freedom to encode information, both in classical and quantum applications. In particular, quantum information technologies based on photons are being revolutionised by the use of integrated photonic circuits. It is therefore very important to be able to manipulate the polarisation of photons in such circuits. We experimentally demonstrate the fabrication by femtosecond laser micromachining of components such as polarisation insensitive and polarising directional couplers, operating at 1550 nm wavelength, where the two opposite behaviours are achieved just by controlling the geometric layout of the photonic circuits, being the waveguides fabricated with the same irradiation recipe...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28878161/tapered-optical-fiber-functionalized-with-palladium-nanoparticles-by-drop-casting-and-laser-radiation-for-h-8322-and-volatile-organic-compounds-sensing-purposes
#2
Nancy Elizabeth González-Sierra, Luz Del Carmen Gómez-Pavón, Gerardo Francisco Pérez-Sánchez, Arnulfo Luis-Ramos, Plácido Zaca-Morán, Jesús Manuel Muñoz-Pacheco, Francisco Chávez-Ramírez
A comparative study on the sensing properties of a tapered optical fiber pristine and functionalized with the palladium nanoparticles to hydrogen and volatile organic compounds (VOCs), is presented. The sensor response and, response/recovery times were extracted from the measurements of the transient response of the device. The tapered optical fiber sensor was fabricated using a single-mode optical fiber by the flame-brushing technique. Functionalization of the optical fiber was performed using an aqueous solution of palladium chloride by drop-casting technique assisted for laser radiation...
September 6, 2017: Sensors
https://www.readbyqxmd.com/read/28860531/ultra-broad-mid-ir-supercontinuum-generation-in-single-bi-and-tri-layer-graphene-nano-plasmonic-waveguides-pumping-at-low-input-peak-powers
#3
Swetha S Bobba, Arti Agrawal
This article presents four different plasmonic structures using Graphene which yielded an efficient plasmonic mode with low loss for Supercontinuum(SC) generation. At an operating wavelength of 1550 nm in these structures, we generated a multi-octave broadband SC spectrum ranging from 1.5 um-25 um at a low input peak power of 1 W. Due to pumping in the anomalous dispersion region with two Zero Dispersion Wavelengths (ZDWs) and the process of cross phase modulation with soliton fission, red-shifted dispersive waves were generated which led to large broadening from 1...
August 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28853175/safety-of-non-ablative-fractional-laser-for-acne-scars-within-1-month-after-treatment-with-oral-isotretinoin-a-randomized-split-face-controlled-trial
#4
Sandeep S Saluja, Matthew L Walker, Erika M Summers, Payam Tristani-Firouzi, David R Smart
BACKGROUND AND OBJECTIVE: Based on reports of poor wound healing and scarring, it is currently recommended that patients wait 6 months after completion of oral isotretinoin therapy before the safe initiation of laser treatment. Our aim was to evaluate the safety of non-ablative fractional laser (NAFL) treatment for acne scars within 1 month after isotretinoin therapy. STUDY DESIGN/METHODS: This was a randomized split-face controlled trial involving 10 patients with acne scars who had completed isotretinoin treatment...
August 29, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/28831178/silicon-rich-nitride-ring-resonators-for-rare-earth-doped-telecommunications-band-amplifiers-pumped-at-the-o-band
#5
P Xing, G F R Chen, X Zhao, D K T Ng, M C Tan, D T H Tan
Ring resonators on silicon rich nitride for potential use as rare-earth doped amplifiers pumped at 1310 nm with amplification at telecommunications-band are designed and characterized. The ring resonators are fabricated on 300 nm and 400 nm silicon rich nitride films and characterized at both 1310 nm and 1550 nm. We demonstrate ring resonators exhibiting similar quality factors exceeding 10,000 simultaneously at 1310 nm and 1550 nm. A Dysprosium-Erbium material system exhibiting photoluminescence at 1510 nm when pumped at 1310 nm is experimentally demonstrated...
August 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28820599/optical-gating-of-black-phosphorus-for-terahertz-detection
#6
Martin Mittendorff, Ryan J Suess, Edward Leong, Thomas E Murphy
Photoconductive antennas are widely used for time-resolved detection of terahertz (THz) pulses. In contrast to photothermoelectric or bolometric THz detection, the coherent detection allows direct measurement of the electric field transient of a THz pulse, which contains both spectral and phase information. In this Letter, we demonstrate for the first time photoconductive detection of free-space propagating THz radiation with thin flakes of a van der Waals material. Mechanically exfoliated flakes of black phosphorus are combined with an antenna that concentrates the THz fields to the small flake (∼10 μm)...
September 13, 2017: Nano Letters
https://www.readbyqxmd.com/read/28818819/quantifying-human-movement-using-the-movn-smartphone-app-validation-and-field-study
#7
Ralph Maddison, Luke Gemming, Javier Monedero, Linda Bolger, Sarahjane Belton, Johann Issartel, Samantha Marsh, Artur Direito, Madeleine Solenhill, Jinfeng Zhao, Daniel John Exeter, Harshvardhan Vathsangam, Jonathan Charles Rawstorn
BACKGROUND: The use of embedded smartphone sensors offers opportunities to measure physical activity (PA) and human movement. Big data-which includes billions of digital traces-offers scientists a new lens to examine PA in fine-grained detail and allows us to track people's geocoded movement patterns to determine their interaction with the environment. OBJECTIVE: The objective of this study was to examine the validity of the Movn smartphone app (Moving Analytics) for collecting PA and human movement data...
August 17, 2017: JMIR MHealth and UHealth
https://www.readbyqxmd.com/read/28818399/nano-carbons-from-waste-tyre-rubber-an-insight-into-structure-and-morphology
#8
Samane Maroufi, Mohannad Mayyas, Veena Sahajwalla
This study reports on the novel and sustainable synthesis of high value carbon nanoparticles (CNPs) from waste tyre rubber (WTR), using an innovative high temperature approach. As waste tyres are composed, primarily, of carbon - accounting for some 81.2wt% - they represent a promising source of carbon for many potential applications. However, cost-effective options for their processing are limited and, consequently, billions of waste tyres have accumulated in landfills and stockpiles, posing a serious global environmental threat...
August 14, 2017: Waste Management
https://www.readbyqxmd.com/read/28813105/a-scientific-survey-on-1550-cases-of-oral-lesions-diagnosed-in-a-brazilian-referral-center
#9
Artur C Vasconcelos, Carlos Aburad, Igor F P Lima, Sheila M M Santos, Silas Antonio J DE Freitas, Ademir Franco, Sigmar M Rode, Luiz R Paranhos
The present study aimed to perform an epidemiological survey on the prevalence rate of oral lesions diagnosed in a referral center in Brazil and to establish association between the lesions and the age and gender of the affected patients. This analytical observational study analyzed 3521 medical records of anatomopathological exams of the Pathological Anatomy and Cytopathology Laboratory of the Cancer Hospital of the state of Mato Grosso (Brazil), from December 2011 to September 2015. A total of 1550 relevant medical records was detected...
August 14, 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28812164/efficacy-of-fractional-lasers-in-treating-alopecia-a-literature-review
#10
Marina Perper, Adam S Aldahan, Rachel A Fayne, Christopher P Emerson, Keyvan Nouri
Hair loss stemming from different types of alopecia, such as androgenic alopecia and alopecia areata, negatively affects over half the population and, in many circumstances, causes serious psychosocial distress. Current treatment options for alopecia, such as minoxidil, anthralin, and intralesional corticosteroids, vary efficacy and side effect profiles. It is known that low-level laser/light therapies (LLLT), or photobiomodulations, such as the US FDA-cleared HairMax Lasercomb®, He-Ne laser, and excimer laser, are relatively affordable, user-friendly, safe, and effective forms of treatment for hair loss...
August 16, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28806982/software-guided-versus-nurse-directed-blood-glucose-control-in-critically-ill-patients-the-logic-2-multicenter-randomized-controlled-clinical-trial
#11
Dieter Mesotten, Jasperina Dubois, Tom Van Herpe, Roosmarijn T van Hooijdonk, Ruben Wouters, Domien Coart, Pieter Wouters, Aimé Van Assche, Guy Veraghtert, Bart De Moor, Joost Wauters, Alexander Wilmer, Marcus J Schultz, Greet Van den Berghe
BACKGROUND: Blood glucose control in the intensive care unit (ICU) has the potential to save lives. However, maintaining blood glucose concentrations within a chosen target range is difficult in clinical practice and holds risk of potentially harmful hypoglycemia. Clinically validated computer algorithms to guide insulin dosing by nurses have been advocated for better and safer blood glucose control. METHODS: We conducted an international, multicenter, randomized controlled trial involving 1550 adult, medical and surgical critically ill patients, requiring blood glucose control...
August 14, 2017: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/28803363/evaluation-of-nonablative-fractional-laser-treatment-in-scar-reduction
#12
Hilal Gokalp
Fractional lasers have been used for the improvement of scar tissue in the recent years but there has not been extensive research on their impact. The purpose of this study was to evaluate the efficacy of nonablative fractional laser (NAFL) on acne, burn, and surgery/traumatic scar. The scars were also categorized as atrophic, hypertrophic, and keloid, and treatment efficacy was investigated accordingly. This is a retrospective, single-center study. Scar tissues were treated using a nonablative fractional 1550-nm Erbium glass laser in high-energy parameters at 4-week interval for 4-8 sessions...
August 12, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28795507/bright-aie-nanoparticles-with-f127-encapsulation-for-deep-tissue-three-photon-intravital-brain-angiography
#13
Yalun Wang, Xiao Han, Wang Xi, Jinyu Li, Anna Wang Roe, Ping Lu, Jun Qian
Deep-tissue imaging is of great significance to biological applications. In this paper, a deep-red emissive luminogen 2,3-bis(4'-(diphenylamino)-[1,1'-biphenyl]-4-yl) fumaronitrile (TPATCN) with aggregation-induced emission (AIE) feature is prepared. TPATCN molecules were then encapsulated within a polymeric matrix of Pluronic F-127 to form nanoparticles (NPs). TPATCN NPs exhibit bright three-photon fluorescence (3PF) in deep-red region, together with high chemical stability, good photostability, and biocompatibility...
August 10, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28791677/patterns-and-prevalence-of-violence-related-skull-trauma-in-medieval-london
#14
Kathryn Krakowka
OBJECTIVES: This study aims to identify the patterns and prevalence of violence-related skull trauma (including the cranium and mandible) among a large sample of skeletons from medieval London (1050-1550 AD). MATERIALS AND METHODS: In total, data from 399 skulls, representing six different sites from across medieval London, were analyzed for evidence of trauma and assessed for the likelihood that it was caused by violence. The sites include the three parish cemeteries of St Nicholas Shambles (GPO75), St Lawrence Jewry (GYE92), and St Benet Sherehog (ONE94); the two monastic houses of London Blackfriars (PIC87) and St Mary Graces (MIN86); and the early inmate cemetery from the medieval hospital of St Mary Spital (NRT85)...
August 9, 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/28774006/an-8-channel-wavelength-mmi-demultiplexer-in-slot-waveguide-structures
#15
Bar Baruch Ben Zaken, Tal Zanzury, Dror Malka
We propose a novel 8-channel wavelength multimode interference (MMI) demultiplexer in slot waveguide structures that operate at 1530 nm, 1535 nm, 1540 nm, 1545 nm, 1550 nm, 1555 nm, 1560 nm, and 1565 nm. Gallium nitride (GaN) surrounded by silicon (Si) was found to be a suitable material for the slot-waveguide structures. The proposed device was designed by seven 1 × 2 MMI couplers, fourteen S-bands, and one input taper. Numerical investigations were carried out on the geometrical parameters using a full vectorial-beam propagation method (FV-BPM)...
November 1, 2016: Materials
https://www.readbyqxmd.com/read/28773923/room-temperature-electroluminescence-from-tensile-strained-si0-13ge0-87-ge-multiple-quantum-wells-on-a-ge-virtual-substrate
#16
Guangyang Lin, Ningli Chen, Lu Zhang, Zhiwei Huang, Wei Huang, Jianyuan Wang, Jianfang Xu, Songyan Chen, Cheng Li
Direct band electroluminescence (EL) from tensile-strained Si0.13Ge0.87/Ge multiple quantum wells (MQWs) on a Ge virtual substrate (VS) at room temperature is reported herein. Due to the competitive result of quantum confinement Stark effect and bandgap narrowing induced by tensile strain in Ge wells, electroluminescence from Γ1-HH1 transition in 12-nm Ge wells was observed at around 1550 nm. As injection current density increases, additional emission shoulders from Γ2-HH2 transition in Ge wells and Ge VS appeared at around 1300-1400 nm and 1600-1700 nm, respectively...
September 27, 2016: Materials
https://www.readbyqxmd.com/read/28772566/tunable-broadband-nonlinear-optical-properties-of-black-phosphorus-quantum-dots-for-femtosecond-laser-pulses
#17
Xiao-Fang Jiang, Zhikai Zeng, Shuang Li, Zhinan Guo, Han Zhang, Fei Huang, Qing-Hua Xu
Broadband nonlinear optical properties from 500 to 1550 nm of ultrasmall black phosphorus quantum dots (BPQDs) have been extensively investigated by using the open-aperture Z-scan technique. Our results show that BPQDs exhibit significant nonlinear absorption in the visible range, but saturable absorption in the near-infrared range under femtosecond excitation. The calculated nonlinear absorption coefficients were found to be (7.49 ± 0.23) × 10(-3), (1.68 ± 0.078) × 10(-3) and (0.81 ± 0.03) × 10(-3) cm/GW for 500, 700 and 900 nm, respectively...
February 21, 2017: Materials
https://www.readbyqxmd.com/read/28759789/changes-in-carbohydrate-levels-and-relative-water-content-rwc-to-distinguish-dormancy-phases-in-sweet-cherry
#18
Heiko Kaufmann, Michael Blanke
Perennial trees require chilling, i.e. a period of cold temperature in the winter, for flowering next spring; sweet cherry is particularly prone to lack of chilling. The objective of this study is to identify possible transition points to clearly distinguish dormancy phases by relating carbohydrate and relative water content (RWC) in reproductive buds to concomitant chilling fulfilment. This contribution proposes the use of four transition points between the dormancy phases and their characterization in terms of carbohydrates, water contents in combination with chilling values and may allow upscaling to other dormancy studies in trees; two groups of cherry varieties were defined based on their different initial sorbitol and starch level in the autumn...
July 19, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28755172/micro-lesion-effect-of-the-globus-pallidus-internus-with-deep-brain-stimulation-in-parkinson-s-disease-patients
#19
Yi Wang, Peng Li, FeiLong Gong, Yuan Gao, Yang Y Xu, Wei Wang
BACKGROUND: The micro-lesion effect (MLE) has been observed in many Parkinson's disease (PD) patients after deep brain stimulation (DBS) surgery. For subthalamic nucleus (STN) stimulation, the MLE has been reported as a predictor of the long-term efficacy of DBS. However, the research on the MLE in the globus pallidus internus (GPi) is insufficient. In this report, we conducted a study of the correlation between the MLE and improvement of GPi DBS. METHODS: From July 2014 to November 2015, 36 PD patients underwent GPi DBS in our hospital...
July 28, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28755010/switchable-phase-and-polarization-singular-beams-generation-using-dielectric-metasurfaces
#20
Yanliang He, Ying Li, Junmin Liu, Xiaoke Zhang, Yao Cai, Yu Chen, Shuqing Chen, Dianyuan Fan
Singular beams which possess helical phase wavefront or spatially inhomogeneous polarization provide new freedom for optical field manipulation. However, conventional schemes to produce the singular beams have difficulty in realizing the flexible switch between different singular beams. In this work, we have experimentally demonstrated the capability of dielectric metasurfaces to generate three types of singular beams and switch between them at working wavelength of 1550  nm. We have shown vortex beam and cylindrical vector beam generation with single metasurface and cylindrical vector vortex beam generation with two cascaded metasurfaces...
July 28, 2017: Scientific Reports
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