Applications of Optics and Photonics最新文献_第3页

Fabry-Perot interferometer based on array of microspheres for temperature sensing 基于微球阵列的温度传感法布里-珀罗干涉仪

Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2275658

M. Ferreira, J. Bierlich, J. Kobelke, J. Santos, O. Frazão

引用次数: 1

Optical bias selector based on a multilayer a-SiC:H optical filter 基于多层a- sic:H滤光片的光学偏置选择器

Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2271359

M. Vieira, M. Vieira, P. Louro

{"title":"Optical bias selector based on a multilayer a-SiC:H optical filter","authors":"M. Vieira, M. Vieira, P. Louro","doi":"10.1117/12.2271359","DOIUrl":"https://doi.org/10.1117/12.2271359","url":null,"abstract":"In this paper we present a MUX/DEMUX device based on a multilayer a-SiC:H optical filter that requires nearultraviolet steady state optical switches to select desired wavelengths in the visible range. Spectral response and transmittance measurements are presented and show the feasibility of tailoring the wavelength and bandwidth of a polychromatic mixture of different wavelengths. The selector filter is realized by using a two terminal double pi’n/pin a-SiC:H photodetector. Five visible communication channels are transmitted together, each one with a specific bit sequence. The combined optical signal is analyzed by reading out the photocurrent, under near-UV front steady state background. Data shows that 25 current levels are detected and corresponds to the thirty-two on/off possible states. The proximity of the magnitude of consecutive levels causes occasional errors in the decoded information. To minimize the errors, four parity bit are generated and stored along with the data word. The parity of the word is checked after reading the word to detect and correct the transmitted data. Results show that the background works as a selector in the visible range, shifting the sensor sensitivity and together with the parity check bits allows the identification and decoding of the different input channels. A transmission capability of 60 kbps using the generated codeword was achieved. An optoeletronic model gives insight on the system physics.","PeriodicalId":150522,"journal":{"name":"Applications of Optics and Photonics","volume":"212 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115661750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fast physical ray-tracing method for gravitational lensing using heterogeneous supercomputing in GPGPU 基于GPGPU异构超级计算的引力透镜快速物理光线追踪方法

Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2272053

J. C. Costa, M. Gomes, R. Alves, N. Silva, A. Guerreiro

引用次数: 0

Solving the multi-level Maxwell-Bloch equations using GPGPU computing for the simulation of nonlinear optics in atomic gases 用GPGPU计算求解原子气体中非线性光学的多层Maxwell-Bloch方程

Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2272044

J. C. Costa, M. Gomes, R. Alves, N. Silva, A. Guerreiro

引用次数: 3

Polymer and tapered silica fiber connection for polymer fiber sensor application 聚合物与锥形硅纤维连接，用于聚合物光纤传感器

Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2276343

Miguel F. S. Ferreira, André D. Gomes, D. Kowal, G. Statkiewicz-Barabach, P. Mergo, O. Frazão

引用次数: 0

Special microstructured fibers with irregular and regular claddings for supercontinuum generation 具有不规则和规则包层的特殊微结构纤维，用于产生超连续统

Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2271838

V. Minkovich, M. Vaca Pereira G, J. Villatoro, A. Sotsky, M. Illarramendi, J. Zubía

引用次数: 0

Continual and molecular dynamics approaches in determining thermal properties of silicon 测定硅热性能的连续动力学和分子动力学方法

Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2271999

A. Mazhukin, O. Koroleva, V. Mazhukin, A. V. Shapranov

{"title":"Continual and molecular dynamics approaches in determining thermal properties of silicon","authors":"A. Mazhukin, O. Koroleva, V. Mazhukin, A. V. Shapranov","doi":"10.1117/12.2271999","DOIUrl":"https://doi.org/10.1117/12.2271999","url":null,"abstract":"The article discusses the use of mathematical modeling to obtain properties of silicon. The nonequilibrium heating of semiconductor proceeds with a large separation of temperatures of the current carriers from the lattice, therefore, in the problems of laser action a silicon target can be regarded as an object consisting of two interacting subsystems, electron and phonon subsystems. At the same time, for each of subsystems it is necessary to determine thermophysical, optical and thermodynamic characteristics that vary over a wide temperature range. To determine the properties of the electronic subsystem a continual approach was used, and for the phonon subsystem a molecular-dynamic approach was used. Such properties of the electron Fermi gas as electron concentration Ne(T), holes concentration Nh(T), Fermi energy EF(T), band gap Eg(T,N), carrier mobility μ(T,N), electrical conductivity σ(T,N) are determined within the framework of quantum statistics in an arbitrary degeneracy range when the temperature varies from 300K to 2000K. The most important characteristics of the phonon subsystem such as the pressure dependences of the melting temperature of silicon Tm(P) and the heat of melting Lm(P), and the temperature dependence of the heat of evaporation Lv(T) were determined. The results are compared with the experimental data.","PeriodicalId":150522,"journal":{"name":"Applications of Optics and Photonics","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128661798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Evaluating polarization diversity for speckle reduction in retinal image quality estimates 评估偏振多样性斑点减少视网膜图像质量估计

Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2276298

J. Herrera-Ramírez, D. Hincapie-Zuluaga, N. Correa, Raul Castañeda-Quintero, J. Gaviria, M. Aldana

引用次数: 0

Validation of a semi-automatic protocol for the assessment of the tear meniscus central area based on open-source software 基于开源软件的半月板撕裂中心区域半自动评估方案的验证

Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2271783

Hugo Pena-Verdeal, C. García-Resúa, E. Yebra-Pimentel, M. .. Giraldez

{"title":"Validation of a semi-automatic protocol for the assessment of the tear meniscus central area based on open-source software","authors":"Hugo Pena-Verdeal, C. García-Resúa, E. Yebra-Pimentel, M. .. Giraldez","doi":"10.1117/12.2271783","DOIUrl":"https://doi.org/10.1117/12.2271783","url":null,"abstract":"Purpose: Different lower tear meniscus parameters can be clinical assessed on dry eye diagnosis. The aim of this study was to propose and analyse the variability of a semi-automatic method for measuring lower tear meniscus central area (TMCA) by using open source software. Material and methods: On a group of 105 subjects, one video of the lower tear meniscus after fluorescein instillation was generated by a digital camera attached to a slit-lamp. A short light beam (3x5 mm) with moderate illumination in the central portion of the meniscus (6 o’clock) was used. Images were extracted from each video by a masked observer. By using an open source software based on Java (NIH ImageJ), a further observer measured in a masked and randomized order the TMCA in the short light beam illuminated area by two methods: (1) manual method, where TMCA images was “manually” measured; (2) semi-automatic method, where TMCA images were transformed in an 8-bit-binary image, then holes inside this shape were filled and on the isolated shape, the area size was obtained. Finally, both measurements, manual and semi-automatic, were compared. Results: Paired t-test showed no statistical difference between both techniques results (p = 0.102). Pearson correlation between techniques show a significant positive near to perfect correlation (r = 0.99; p < 0.001). Conclusions: This study showed a useful tool to objectively measure the frontal central area of the meniscus in photography by free open source software.","PeriodicalId":150522,"journal":{"name":"Applications of Optics and Photonics","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125325682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The extended Kubelka-Munk theory and its application to colloidal systems 扩展的Kubelka-Munk理论及其在胶体体系中的应用

Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2272115

R. Alcaraz de la Osa, A. Fernández, Y. Gutiérrez, D. Ortiz, F. González, F. Moreno, J. Saiz

引用次数: 1