Recent Nanowire Superconducting Single-Photon Detector Optimization for Practical Applications
In this paper, we present our approaches to the development of fiber-coupled superconducting single photon detectors with enhanced photon absorption. For such devices we have measured detection efficiency in wavelength range from 500 to 2000 nm. The best fiber coupled devices exhibit detection efficiency of 44.5% at 1310 nm wavelength and 35.5% at 1550 nm at 10 dark counts per second.
This edition presents abstracts of the reports of the Meeting and Youth Conference on Neutron Scattering and Synchrotron Radiationin Condensed Matte (NSSR-CM-2014)r
Method of in-situ X-ray reflectivity is presented. The results of investigation of titanium and silicon thin films in real-time of their deposition on silicon substrates are discussed.
An example of the construction of acceleration sensors based on fiber-optical displacement transducers with external modulation. Designed the prototype of fiber-optical accelerometer and tested according to the elaborated methodology.
Even back in 1938 an increase of the superconducting critical temperature with a reduction of an Al film thickness was observed, while some other superconductors exhibit an opposite dependence[1,2]. Despite the long history of studying, the nature of this size-effect is still disputable. Presumably, origin of that effect is attributed to amorphous phase, impurities or other essential inhomogeneities in crystal structure of the samples. Anyway, it has been investigated mainly with highly disordered films, but virtually unexplored for ultrathin monocrystalline structures. Besides, there was no strict control of purity and structure of samples. There is hypothesis that if you take pure monocrystal film of any thickness there will not be difference of superconductive critical temperature from the bulk. However, it is still not confirmed neither as disproved because of complexity of fabrication and quality control. Our colleges from Greece manufactured samples of different thickness (from 10 to 100nm), using molecular beam epitaxy method. We control their structure with atomic -force and scanning electron Microscopy(AFM, SEM) and angle-resolved photoemission spectroscopy (ARPES). We have performed investigation of thickness dependence of critical temperature in atomic pure monocrystal aluminum films. All measurements was set in He-3 based cryo-insert, which is capable to obtain temperature down to 300 mK. To improve accuracy of temperature measurements our thermometers was additionally calibrated by reference point of superconducting transition in bulk aluminum samples. To avoid influence of noises setup was equipped with EMS- filters.
In the frame of the third-order nonlinear wave dispersion theory the equation of motion of a vector wave packets mass center taken in to account arbitrary inhomogeneity profile is obtained. As short vector wave packets localized motion as infinite motion is shown. Short vector wave packets localizations area can be as bigger as smaller in comparison with long vector wave packets localizations area. The effect depend from third-order linear dispersion parameter.
The interaction of short single-component vector solitons in the frame of the coupled third–order nonlinear Schrodinger equations taking into account third–order linear dispersion, self–stepping, self–stimulated Ramanscattering, cross–stepping and cross–stimulated Raman-scattering terms is considered. Conditions of reflection and propagation of the solitons through each other and also the condition of oscillator interaction (vector breather) are obtained.
This payment is made in accordance to the state educational standards and training program in the discipline "Physiology" basic educational programs direction 032100 "Physical Culture". The manual presents the modern studies of the functional state of the organism in terms of high and low atmospheric pressure, and high and low ambient temperatures. The manual is intended for students, teachers, coaches.
The dynamics of a two-component Davydov-Scott (DS) soliton with a small mismatch of the initial location or velocity of the high-frequency (HF) component was investigated within the framework of the Zakharov-type system of two coupled equations for the HF and low-frequency (LF) fields. In this system, the HF field is described by the linear Schrödinger equation with the potential generated by the LF component varying in time and space. The LF component in this system is described by the Korteweg-de Vries equation with a term of quadratic influence of the HF field on the LF field. The frequency of the DS soliton`s component oscillation was found analytically using the balance equation. The perturbed DS soliton was shown to be stable. The analytical results were confirmed by numerical simulations.
Radiation conditions are described for various space regions, radiation-induced effects in spacecraft materials and equipment components are considered and information on theoretical, computational, and experimental methods for studying radiation effects are presented. The peculiarities of radiation effects on nanostructures and some problems related to modeling and radiation testing of such structures are considered.
This volume presents new results in the study and optimization of information transmission models in telecommunication networks using different approaches, mainly based on theiries of queueing systems and queueing networks .
The paper provides a number of proposed draft operational guidelines for technology measurement and includes a number of tentative technology definitions to be used for statistical purposes, principles for identification and classification of potentially growing technology areas, suggestions on the survey strategies and indicators. These are the key components of an internationally harmonized framework for collecting and interpreting technology data that would need to be further developed through a broader consultation process. A summary of definitions of technology already available in OECD manuals and the stocktaking results are provided in the Annex section.