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Ashish Arora, Jonathan Noky, Matthias Drüppel, Bhakti Jariwala, Thorsten Deilmann, Robert Schneider, Robert Schmidt, Osvaldo Del Pozo-Zamudio, Torsten Stiehm, Arnab Bhattacharya, Peter Krüger, Steffen Michaelis de Vasconcellos, Michael Rohlfing, Rudolf Bratschitsch
Atomically thin materials such as graphene or MoS2 are of high in-plane symmetry. Crystals with reduced symmetry hold the promise for novel optoelectronic devices based on their anisotropy in current flow or light polarization. Here, we present polarization-resolved optical transmission and photoluminescence spectroscopy of excitons in 1T'-ReSe2. On reducing the crystal thickness from bulk to a monolayer, we observe a strong blue shift of the optical band gap from 1.37 to 1.50 eV. The excitons are strongly polarized with dipole vectors along different crystal directions, which persist from bulk down to monolayer thickness...
April 21, 2017: Nano Letters
Xin Li, Matthew B Jordan, Taha Ayari, Suresh Sundaram, Youssef El Gmili, Saiful Alam, Muhbub Alam, Gilles Patriarche, Paul L Voss, Jean Paul Salvestrini, Abdallah Ougazzaden
Practical boron nitride (BN) detector applications will require uniform materials over large surface area and thick BN layers. To report important progress toward these technological requirements, 1~2.5 µm-thick BN layers were grown on 2-inch sapphire substrates by metal-organic vapor phase epitaxy (MOVPE). The structural and optical properties were carefully characterized and discussed. The thick layers exhibited strong band-edge absorption near 215 nm. A highly oriented two-dimensional h-BN structure was formed at the film/sapphire interface, which permitted an effective exfoliation of the thick BN film onto other adhesive supports...
April 11, 2017: Scientific Reports
Robert Schroot, Michael Jäger, Ulrich S Schubert
Electrochemically active polymers are widely used in (opto)electronic applications, e.g. organic light-emitting diodes (OLEDs), organic field-effect transistors (OFETs), solar cells or other light harvesting devices. In this regard, the progress in controlled polymerization techniques opens new possibilities to construct covalently linked polymer architectures, e.g. block copolymers or graft copolymers, from defined building blocks. These architectures represent promising candidates for application in (opto)electronic devices as they allow control of the morphology through self-assembly processes and, furthermore, are capable of mimicking fundamental processes for directional charge transport or light harvesting...
April 11, 2017: Chemical Society Reviews
Shi Ye, Jiayi Sun, Xiong Yi, Yonggang Wang, Qinyuan Zhang
Luminescent zeolites exchanged with two distinct and interacted emissive ions are vital but less-studied for the potential applications in white light emitting diodes, solar cells, optical codes, biomedicine and so on. Typical transition metal ion Mn(2+) and lanthanide ion Yb(3+) are adopted as a case study via their characteristic transitions and the interaction between them. The option is considered with that the former with d-d transition has a large gap between the first excited state (4)T1 and the ground state (6)A1 (normally >17,000 cm(-1)) while the latter with f-f transition has no metastable excited state above 10,000 cm(-1), which requires the vicinity of these two ions for energy transfer...
April 10, 2017: Scientific Reports
Wei Sun, Grace Zhong, Christian Kübel, Abdinoor A Jelle, Chenxi Qian, Lu Wang, Manuchehr Ebrahimi, Laura M Reyes, Amr S Helmy, Geoffrey A Ozin
Germanium nanocrystals (ncGe) have not received as much attention as silicon nanocrystals (ncSi). However, Ge has demonstrated superiority over Si nanomaterials in some applications. Examples include, high charge-discharge rate lithium-ion batteries, small band-gap opto-electronic devices, and photo-therapeutics. When stabilized in an oxide matrix (ncGe/GeOx ), its high charge-retention has enabled non-volatile memories. It has also found utility as a high-capacity anode material for Li-ion batteries with impressive stability...
April 10, 2017: Angewandte Chemie
Shiheng Liang, Huaiwen Yang, Pierre Renucci, Bingshan Tao, Piotr Laczkowski, Stefan Mc-Murtry, Gang Wang, Xavier Marie, Jean-Marie George, Sébastien Petit-Watelot, Abdelhak Djeffal, Stéphane Mangin, Henri Jaffrès, Yuan Lu
Molybdenum disulfide has recently emerged as a promising two-dimensional semiconducting material for nano-electronic, opto-electronic and spintronic applications. However, the demonstration of an electron spin transport through a semiconducting MoS2 channel remains challenging. Here we show the evidence of the electrical spin injection and detection in the conduction band of a multilayer MoS2 semiconducting channel using a two-terminal spin-valve configuration geometry. A magnetoresistance around 1% has been observed through a 450 nm long, 6 monolayer thick MoS2 channel with a Co/MgO tunnelling spin injector and detector...
April 7, 2017: Nature Communications
Attilio Frangi, Andrea Guerrieri, Nicoló Boni
Electrostatically actuated torsional micromirrors are key elements in Micro-Opto-Electro- Mechanical-Systems. When forced by means of in-plane comb-fingers, the dynamics of the main torsional response is known to be strongly non-linear and governed by parametric resonance. Here, in order to also trace unstable branches of the mirror response, we implement a simplified continuation method with arc-length control and propose an innovative technique based on Finite Elements and the concepts of material derivative in order to compute the electrostatic stiffness; i...
April 6, 2017: Sensors
Germán Fernández Barranco, Oliver Gerberding, Thomas S Schwarze, Benjamin S Sheard, Christian Dahl, Bernd Zender, Gerhard Heinzel
A photoreceiver (PR) is required for the opto-electrical conversion of signals in intersatellite laser interferometers. Noise sources that originate or couple in the PR reduce the system carrier-to-noise-density, which is often represented by its phase noise density. In this work, we analyze the common noise sources in a PR used for space-based interferometry. Additionally, we present the results from the characterization of the PRs in GRACE-FO, a mission which will pioneer intersatellite laser interferometry...
April 3, 2017: Optics Express
Annie Kumar, Shuh-Ying Lee, Sachin Yadav, Kian Hua Tan, Wan Khai Loke, Satrio Wicaksono, Daosheng Li, Saeid Masudy Panah, Gengchiau Liang, Soon-Fatt Yoon, Xiao Gong, Dimitri Antoniadis, Yee-Chia Yeo
We report the first monolithic integration of InGaAs channel field-effect transistors with InGaAs/GaAs multiple quantum wells (MQWs) lasers on a common platform, achieving a milestone in the path of enabling low power and high speed opto-electronic integrated circuits (OEICs). The III-V layers used for realizing transistors and lasers were grown epitaxially on the Ge substrate using molecular beam epitaxy (MBE). A Si-CMOS compatible process was developed to realize InGaAs n-FETs with subthreshold swing SS of 93 mV/decade, I<sub>ON</sub>/I<sub>OFF</sub> ratio of more than 4 orders of magnitude with very low off-state leakage current, and a peak effective mobility of more than 2000 cm<sup>2</sup>/V·s...
March 6, 2017: Optics Express
Mehjabin S Monjur, Shih Tseng, Mohamed F Fouda, Selim M Shahriar
Optical target recognition using correlators is an important technique for fast verification and identification of images. The hybrid opto-electronic correlator (HOC) recently proposed by us bypasses the need for nonlinear materials such as photorefractive polymer films by using detectors instead, and the phase information is yet conserved by the interference of plane waves with the images. In this paper, we demonstrate experimentally the basic working principle of the HOC architecture using currently available technologies...
April 1, 2017: Applied Optics
M D Heinemann, R Mainz, F Österle, H Rodriguez-Alvarez, D Greiner, C A Kaufmann, T Unold
Optical and electrical properties of complex semiconducting alloys like Cu(In,Ga)Se2 (CIGS) are strongly influenced by the reaction pathways occurring during their deposition process. This makes it desirable to observe and control these properties in real-time during the deposition. Here we show for the first time the evolution of the band gap and the sub-band-gap defect absorption of CIGS thin film as well as surface roughness during a three-stage co-evaporation process by means of an optical analysis technique, based on white light reflectometry (WLR)...
April 4, 2017: Scientific Reports
Zhe Chen, Zurong Qiu, Xinming Huo, Yuming Fan, Xinghua Li
A fiber-capacitive drop analyzer is an instrument which monitors a growing droplet to produce a capacitive opto-tensiotrace (COT). Each COT is an integration of fiber light intensity signals and capacitance signals and can reflect the unique physicochemical property of a liquid. In this study, we propose a solution analytical and concentration quantitative method based on multivariate statistical methods. Eight characteristic values are extracted from each COT. A series of COT characteristic values of training solutions at different concentrations compose a data library of this kind of solution...
March 2017: Review of Scientific Instruments
Xuejing Chen, Christian J Sanfilippo, Aaron Nagiel, Hamid Hosseini, Devery Mitchell, Colin A McCannel, Steven D Schwartz, Tara A McCannel
PURPOSE: To study the use of ultra-widefield fluorescein angiography (UWF FA) in the detection and management of retinal capillary hemangioblastomas in patients with von Hippel-Lindau disease. METHODS: This is a retrospective study of patients with von Hippel-Lindau disease who underwent UWF FA using the Optos camera at a single center from June 2009 to May 2015. The clinical use of UWF FA was reviewed, and the number of hemangioblastomas identified on UWF FA was compared with ophthalmoscopy and a simulated seven standard field (7SF) FA montage...
March 30, 2017: Retina
Murugan Veerapandian, Pramod K Avti, V Ravichandiran
Simple and versatile methodology to synthesize hybrid nanostructures with multi-functionality for device application is advantageous. Herein, we report the synthesis of MoO3 nanostructures integrated with [Ru(bpy)3](2+) and PEGylation to obtain hybrid MoO3-[Ru(bpy)3](2+) nanostructures. Chemically interacted [Ru(bpy)3](2+) provides optical and electrochemical properties to the hybrid structures. PEG3k enhances the aqueous solubility of the hybrid system. Morphology, chemical structure, optical and electrochemical properties of hybrid nanostructures were studied from electron microscopic, spectroscopic and voltammetric techniques...
March 16, 2017: Colloids and Surfaces. B, Biointerfaces
Sofie Debaere, Benedicte Vanwanseele, Christophe Delecluse, Dirk Aerenhouts, Friso Hagman, Ilse Jonkers
The aim of this study was to investigate differences in joint power generation between well-trained adult athletes and young sprinters from block clearance to initial contact of second stance. Eleven under 16 (U16) and 18 under 18 (U18) promising sprinters executed an explosive start action. Fourteen well-trained adult sprinters completed the exact same protocol. All athletes were equipped with 74 spherical reflective markers, while an opto-electronic motion analysis system consisting of 12 infrared cameras (250 Hz, MX3, Vicon, Oxford Metrics, UK) and 2 Kistler force plates (1,000 Hz) was used to collect the three-dimensional marker trajectories and ground reaction forces (Nexus, Vicon)...
March 29, 2017: Sports Biomechanics
Vladimir Toshchevikov, Tatiana Petrova, Marina Saphiannikova
Azobenzene-containing smart materials are able to transform the energy of light into directional mechanical stress. We develop a theory of time-dependent light-induced ordering and deformation in azobenzene materials starting from the kinetic equations of photoisomerization. The liquid crystalline (LC) interactions between rod-like trans-isomers are taken into account. Angular selectivity of the photoisomerization known as an "angular hole burning" or the Weigert effect leads to the light-induced ordering and deformation of the azobenzene materials...
April 12, 2017: Soft Matter
Javad Fotouhi, Bernhard Fuerst, Wolfgang Wein, Nassir Navab
PURPOSE: Cone-Beam Computed Tomography (CBCT) is an important 3D imaging technology for orthopedic, trauma, radiotherapy guidance, angiography, and dental applications. The major limitation of CBCT is the poor image quality due to scattered radiation, truncation, and patient movement. In this work, we propose to incorporate information from a co-registered Red-Green-Blue-Depth (RGBD) sensor attached near the detector plane of the C-arm to improve the reconstruction quality, as well as correcting for undesired rigid patient movement...
March 25, 2017: International Journal of Computer Assisted Radiology and Surgery
Ritwik Mondal, Marco Berritta, Peter M Oppeneer
Femtosecond magneto-optical pump-probe measurements of ultrafast demagnetization show an intriguing difference in the first 100 fs of the magneto-optical Kerr response depending on whether the polarization of the pump and probe beams are in parallel or perpendicular configuration (Bigot et al 2009 Nat. Phys. 5 515). Starting from a most general relativistic Hamiltonian we focus on the ultra-relativistic light-spin interaction and show that this coupling term leads to different light-induced opto-magnetic fields when pump and probe polarization are parallel and perpendicular to each other, providing thus an explanation for the measurements...
March 24, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Antonella Gentile, Francesco Ruffino, Maria Grazia Grimaldi
Due to their peculiar qualities, metal-based nanostructures have been extensively used in applications such as catalysis, electronics, photography, and information storage, among others. New applications for metals in areas such as photonics, sensing, imaging, and medicine are also being developed. Significantly, most of these applications require the use of metals in the form of nanostructures with specific controlled properties. The properties of nanoscale metals are determined by a set of physical parameters that include size, shape, composition, and structure...
June 6, 2016: Nanomaterials
Carlo Massaroni, Elena Carraro, Andrea Vianello, Sandra Miccinilli, Michelangelo Morrone, Irisz K Levai, Emiliano Schena, Paola Saccomandi, Silvia Sterzi, John W Dickinson, Samantha Winter, Sergio Silvestri
BACKGROUND: Optoelectronic plethysmography (OEP) is a non-invasive motion capture method to measure chest wall movements and estimate lung volumes. OBJECTIVES: To provide an overview of the clinical findings and research applications of OEP in the assessment of breathing mechanics across populations of healthy and diseased individuals. METHODS: A bibliographic research was performed with the terms "opto-electronic plethysmography," "optoelectronic plethysmography," and "optoelectronic plethysmograph" in 50 digital library and bibliographic search databases resulting in the selection of 170 studies...
2017: Respiration; International Review of Thoracic Diseases
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