scholarly journals New Trends in the Simulation of Nanosplasmonic Optical D-Type Fiber Sensors

Sensors ◽  
2019 ◽  
Vol 19 (8) ◽  
pp. 1772 ◽  
Author(s):  
Ariel Guerreiro ◽  
Diego Felipe Santos ◽  
José Manuel Baptista
Keyword(s):  
Optical Sensors ◽  
Mode Coupling ◽  
Future Perspectives ◽  
New Materials ◽  
Numerical Techniques ◽  
Physical Processes ◽  
Fiber Sensors ◽  
Sensor Performance ◽  
Fundamental Physical ◽  
Type Fiber

This article presents a review of the numerical techniques employed in simulating plasmonic optical sensors based on metal-dielectric nanostructures, including examples, ranging from conventional D-type fiber sensors, to those based on photonic crystal D-type fibers and incorporating metamaterials, nanowires, among other new materials and components, results and applications. We start from the fundamental physical processes, such as optical and plasmonic mode coupling, and discuss the implementation of the numerical model, optical response customization and their impact in sensor performance. Finally, we examine future perspectives.

scholarly journals Fiber Bragg Grating Sensors Integrated in Polymeric Foils

2010 ◽  
Vol 636-637 ◽  
pp. 1548-1554 ◽  
Author(s):  
A.F. Silva ◽  
F. Gonçalves ◽  
L.A.A. Ferreira ◽  
F.M. Araújo ◽  
P.M. Mendes ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Optical Sensors ◽  
Optical Sensor ◽  
Industrial Process ◽  
High Sensitivity ◽  
Bragg Grating ◽  
Element Analysis ◽  
Fiber Sensors ◽  
Sensor Performance ◽  
Fiber Bragg Grating Sensors

Optical sensors have hit their maturity and a new kind of systems is being developed. This paper deals with the development of a new sensing structure based on polymeric foils and optic fiber sensors, namely the Fiber Bragg Grating sensors. Sensor integration in polymeric foils, using industrial process is the proposed goal. To achieve this goal, Finite Element Analysis was used for prototype modeling and simulation. The model was subjected to loads and restraints in order to retrieve information about stress distribution and displacement of specific points. From the simulation was possible to predict the sections where the sensor should be positioned. A prototype was then fabricated using industrial processes. Tests indicate that the polymeric foil influence on the sensor performance may exist. However, the prototype was able of transferring the full deformation to the optical sensor. Moreover, the optical sensor, which is incorporated in the polymeric foil, is fully functional with high sensitivity, 0.6 picometer by microstrain, allowing deformation measurements, up to 1.2 millimeter.

scholarly journals A review on the properties, reinforcing effects, and commercialization of nanomaterials for cement-based materials

2020 ◽  
Vol 9 (1) ◽  
pp. 303-322 ◽  
Author(s):  
Zhifang Zhao ◽  
Tianqi Qi ◽  
Wei Zhou ◽  
David Hui ◽  
Cong Xiao ◽  
...  
Keyword(s):  
Cement Hydration ◽  
State Of The Art ◽  
Research Progress ◽  
Market Survey ◽  
Future Perspectives ◽  
Nano Silica ◽  
Physical Processes ◽  
Existing Problems ◽  
Cement Based Materials ◽  
The Cost

AbstractThe behavior of cement-based materials is manipulated by chemical and physical processes at the nanolevel. Therefore, the application of nanomaterials in civil engineering to develop nano-modified cement-based materials is a promising research. In recent decades, a large number of researchers have tried to improve the properties of cement-based materials by employing various nanomaterials and to characterize the mechanism of nano-strengthening. In this study, the state of the art progress of nano-modified cement-based materials is systematically reviewed and summarized. First, this study reviews the basic properties and dispersion methods of nanomaterials commonly used in cement-based materials, including carbon nanotubes, carbon nanofibers, graphene, graphene oxide, nano-silica, nano-calcium carbonate, nano-calcium silicate hydrate, etc. Then the research progress on nano-engineered cementitious composites is reviewed from the view of accelerating cement hydration, reinforcing mechanical properties, and improving durability. In addition, the market and applications of nanomaterials for cement-based materials are briefly discussed, and the cost is creatively summarized through market survey. Finally, this study also summarizes the existing problems in current research and provides future perspectives accordingly.

scholarly journals Capturing Waste Heat Energy with Charge-Transfer Organic Thermoelectrics

Synthesis ◽  
2018 ◽  
Vol 50 (19) ◽  
pp. 3833-3842 ◽  
Author(s):  
Vladimir Dimitrov ◽  
Simon Woodward
Keyword(s):  
Waste Heat ◽  
Electrical Power ◽  
Structure Property ◽  
Future Perspectives ◽  
New Materials ◽  
Organic Salts ◽  
Electrically Conducting ◽  
Structure Property Relationships ◽  
Device Applications ◽  
Key Aspects

Electrically conducting organic salts, known for over 60 years, have recently demonstrated new abilities to convert waste heat directly into electrical power via the thermoelectric effect. Multiple opportunities are emerging for new structure–property relationships and for new materials to be obtained through synthetic organic chemistry. This review highlights key aspects of this field, which is complementary to current efforts based on polymeric, nanostructured or inorganic thermoelectric materials and indicates opportunities whereby mainstream organic chemists can contribute.1 What Are Thermoelectrics? And Why Use Them?2 Current Organic and Hybrid Thermoelectrics3 Unique Materials from Tetrathiotetracenes4 Synthesis of Tetrathiotetracenes5 Materials and Device Applications6 Future Perspectives

scholarly journals Effect of combination of dye carotene and phycocyanin using daucus carota and spirulina sp. on optical sensor performance

2020 ◽  
Vol 17 (2) ◽  
pp. 907
Author(s):  
Rahmadwati Rahmadwati ◽  
Luthfiyah Rachmawati ◽  
Panca Mudjirahardjo ◽  
Eka Maulana
Keyword(s):  
Optical Sensors ◽  
Optical Sensor ◽  
Daucus Carota ◽  
Spin Coating ◽  
Deposition Method ◽  
Mercury Lamp ◽  
Current Output ◽  
Sensor Performance ◽  
Absorption Of Light ◽  
Light Absorbance

<span>This research designed optical sensors using mercury lamp of 160W. These sensors provided voltage and current output. The design of optical sensors used the organic based material,i.e. dye  carotene and phycocyanin. Fabrication of optical sensor in this research used spin coating deposition method. Based on the results of absorbance test, dye carotene had the largest absorption of light of 2.882 (a.u).  Dye phycocyanin at length had the largest absorption of light of 2.787 (a.u). Combination between dye carotene and phycocyanin, for a 3: 1 (Carotene: Phycocyanin) ratio had a waveform like a dye carotene with a peak of 2.587 (au), whereas for 1: 3 had a waveform like phycocyanin with a peak of 2,279 (au). But, sample 1: 1 ratio had decrement the light absorbance rate with peaks of 1.183 (au). At the voltage testing result, combination of phycocyanin: carotene (1:3) had the best linearity. The response time of dye 3:1 (phycocyanin: carotene), 1:1, 1:3, phycocyanin, and carotene were 6.72 s, 2.469s, 1.171s, 2.66s and 7.01s respectively. </span>

Advanced Thermoelectric Materials and Systems for Automotive Applications in the Next Millennium

1997 ◽  
Vol 478 ◽  
Author(s):  
Donald T. Morelli
Keyword(s):  
Environmental Economic ◽  
Physical Properties ◽  
Thermoelectric Properties ◽  
Thermoelectric Materials ◽  
Experimental Results ◽  
Automotive Applications ◽  
New Materials ◽  
Thermoelectric Devices ◽  
Filled Skutterudites ◽  
Fundamental Physical

AbstractA combination of environmental, economic, and technological drivers has led to a reassessment of the potential for using thermoelectric devices in several automotive applications. In order for this technology to achieve its ultimate potential, new materials with enhanced thermoelectric properties are required. Experimental results on the fundamental physical properties of some new thermoelectric materials, including filled skutterudites and 1–1–1 intermetallic semiconductors, are presented.

scholarly journals Multiphoton quantum-state engineering using conditional measurements

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
Omar S. Magaña-Loaiza ◽  
Roberto de J. León-Montiel ◽  
Armando Perez-Leija ◽  
Alfred B. U’Ren ◽  
Chenglong You ◽  
...  
Keyword(s):  
Quantum State ◽  
Light Sources ◽  
Physical Processes ◽  
Quantum State Engineering ◽  
Fundamental Properties ◽  
Statistical Fluctuations ◽  
Squeezed Vacuum ◽  
Vacuum States ◽  
Quantum Phenomena ◽  
Fundamental Physical

Abstract The quantum theory of electromagnetic radiation predicts characteristic statistical fluctuations for light sources as diverse as sunlight, laser radiation, and molecule fluorescence. Indeed, these underlying statistical fluctuations of light are associated with the fundamental physical processes behind their generation. In this contribution, we experimentally demonstrate that the manipulation of the quantum electromagnetic fluctuations of two-mode squeezed vacuum states leads to a family of quantum-correlated multiphoton states with tunable mean photon numbers and degree of correlation. Our technique relies on the use of conditional measurements to engineer the excitation mode of the field through the simultaneous subtraction of photons from two-mode squeezed vacuum states. The experimental generation of nonclassical multiphoton states by means of photon subtraction unveils novel mechanisms to control fundamental properties of light. As a remarkable example, we demonstrate the engineering of a quantum state of light with up to ten photons, exhibiting nearly Poissonian photon statistics, that constitutes an important step towards the generation of entangled lasers. Our technique enables a robust protocol to prepare quantum states with multiple photons in high-dimensional spaces and, as such, it constitutes a novel platform for exploring quantum phenomena in mesoscopic systems.

Best System Approaches to Chance

2017 ◽  
Author(s):  
Wolfgang Schwarz
Keyword(s):  
Relative Frequency ◽  
David Lewis ◽  
Radioactive Elements ◽  
Physical Processes ◽  
Fundamental Physics ◽  
The One ◽  
Fundamental Physical ◽  
System Approaches ◽  
Statistical Summary ◽  
Probabilistic Theories

Certain physical processes, such as the decay of radioactive elements, seem to involve an objective, non-epistemic type of probability, often called “chance”. Best system accounts, first proposed by David Lewis, offer a Humean interpretation of chance. On this account, chance is not a fundamental physical quantity, but a kind of statistical summary of actual outcomes. The interpretation explains the close connection between chance on the one hand and relative frequency, disorder, and rational credence on the other hand. It has also proved useful in understanding probabilistic theories outside fundamental physics. On the downside, the proposal arguably fails to vindicate some philosophical preconceptions about chance.

Effect of a-SiC:H Film Composition on the Performance of Large Area Optical Sensors

2001 ◽  
Vol 685 ◽  
Author(s):  
P. Louro ◽  
Yu. Vygranenko ◽  
M. Fernandes ◽  
M. Vieira ◽  
M. Schubert
Keyword(s):  
Optical Sensors ◽  
Carrier Transport ◽  
Energy Band Diagram ◽  
Large Area ◽  
Conduction Band Offset ◽  
Sensor Performance ◽  
Diffusion Limited ◽  
Current Voltage ◽  
Capacitance Voltage ◽  
Limited Process

AbstractA series of large area single layers and heterojunction cells in the assembly glass/ZnO:Al/p (SixC1-x:H)/i (Si:H)/n (SixC1-x:H)/Al (0<x<1) were produced by PE-CVD at low temperature. Junction properties, carrier transport and photogeneration are investigated from dark and illuminated current-voltage and capacitance-voltage characteristics. For the heterojunction cells Atypical J-V characteristics under different illumination conditions are observed leading to poor fill factors. High serial resistances around 106 Ω are also measured. These experimental results were used as a basis for the numerical simulation of the energy band diagram, and the electrical field distribution of the whole structures. Further comparison with the sensor performance gave satisfactory agreement.Results show that the conduction band offset is the most limiting parameter for the optimal collection of the photogenerated carriers. As the optical gap increases and the conductivity of the doped layers decreases, the transport mechanism changes from a drift to a diffusion-limited process.

Discrimination between refractive index and temperature by two cascaded cladding-mode type fiber sensors

2012 ◽  
Author(s):  
Meng Jiang ◽  
Perry Ping Shum ◽  
Zhi Fang Wu ◽  
Xuan Quyen Dinh ◽  
Dora Juan Juan Hu ◽  
...  
Keyword(s):  
Refractive Index ◽  
Fiber Sensors ◽  
Cladding Mode ◽  
Type Fiber

Magnetic Reconnection in the Earth's Magnetotail

1985 ◽  
Vol 38 (6) ◽  
pp. 981 ◽  
Author(s):  
Edward W Hones Jr
Keyword(s):  
Solar Wind ◽  
Magnetic Reconnection ◽  
Plasma Sheet ◽  
Solar Flares ◽  
Reasonable Doubt ◽  
Physical Processes ◽  
Geomagnetic Disturbances ◽  
Magnetospheric Substorms ◽  
The Past ◽  
Fundamental Physical

Over the past few years satellite observations of the plasma sheet in the Earth's magnetotail during magnetospheric substorms have established beyond reasonable doubt that magnetic reconnection occurs in the magnetotail and that it plays a central role in the substorm process. The features seen at Earth by which substorms were originally identified (e.g. the auroras and geomagnetic disturbances) are simply superficial manifestations of a more fundamental physical process-the magnetosphere divesting itself of stored energy and plasma that was acquired earlier from the solar wind. It does so by shedding a part of its plasma sheet. This is accomplished by magnetic reconnection near the Earth that severs the plasma sheet, forming a plasmoid that flows out of the tail and that is lost to the solar wind. Recognition of the existence of plasmoids and our developing understanding of them have been important elements in confirming the occurrence of reconnection in the magnetosphere. In an analogous way, the best evidence for the occurrence of reconnection on the Sun has come from observations of closed magnetic configurations (plasmoids) in the solar wind and in the corona. But while magnetic reconnection is certainly the key ingredient in solar flares and substorms, analogies between them should not be carried too far, because there are basic differences in the environments in which they prevail and in the physical procesSes that lead to their occurrence.

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