scholarly journals A semi-analytical decomposition analysis of surface plasmon generation and the optimal nanoledge plasmonic device

RSC Advances ◽  
2016 ◽  
Vol 6 (21) ◽  
pp. 17196-17203 ◽  
Author(s):  
Zheng Zeng ◽  
Madu N. Mendis ◽  
David H. Waldeck ◽  
Jianjun Wei
Keyword(s):  
Numerical Modeling ◽  
Surface Plasmon ◽  
Experimental Studies ◽  
Decomposition Analysis ◽  
Optical Performance ◽  
Analytical Analysis ◽  
Plasmonic Device

A semi-analytical analysis of a nanoledged plasmonic device for optimal optical performance, validated with numerical modeling and experimental studies.

scholarly journals Generation of Flat Top Surface Plasmon Polariton Beams by Near Field Holography

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1377
Author(s):  
Peizhen Qiu ◽  
Chunyan Bai ◽  
Taiguo Lv ◽  
Dawei Zhang
Keyword(s):  
Surface Plasmon ◽  
Surface Plasmon Polariton ◽  
Structural Parameters ◽  
Near Field ◽  
Practical Application ◽  
Plasmonic Device ◽  
Transverse Profile ◽  
Plasmon Polariton ◽  
The Relationship

Controlling the shape and trajectory of the surface plasmon polariton (SPP) beams is the key to all SPP-based applications. In this paper, a novel plasmonic device that can generate in-plane flat top SPP beams is designed by near field holography. The relationship between the transverse profile intensity of the generated flat top SPP beams and the structural parameters of the designed device is analyzed. The results of this paper can provide the possibility for further practical application utilizing flat top SPP beams.

scholarly journals Singular-value decomposition analysis of source illumination in seismic interferometry by multidimensional deconvolution

Geophysics ◽  
2013 ◽  
Vol 78 (3) ◽  
pp. Q25-Q34 ◽  
Author(s):  
Shohei Minato ◽  
Toshifumi Matsuoka ◽  
Takeshi Tsuji
Keyword(s):  
Inverse Problem ◽  
Numerical Modeling ◽  
Singular Value Decomposition ◽  
Decomposition Analysis ◽  
Incident Field ◽  
Singular Value ◽  
Source Distribution ◽  
Seismic Interferometry ◽  
Source Illumination ◽  
Value Decomposition

We have developed a method to analytically evaluate the relationship between the source-receiver configuration and the retrieved wavefield in seismic interferometry performed by multidimensional deconvolution (MDD). The MDD method retrieves the wavefield with the desired source-receiver configuration from the observed wavefield without source information. We used a singular-value decomposition (SVD) approach to solve the inverse problem of MDD. By introducing SVD into MDD, we obtained quantities that revealed the characteristics of the MDD inverse problem and interpreted the effect of the initial source-receiver configuration for a survey design. We numerically simulated the wavefield with a 2D model and investigated the rank of the incident field matrix of the MDD inverse problem. With a source array of identical length, a sparse and a dense source distribution resulted in an incident field matrix of the same rank and retrieved the same wavefield. Therefore, the optimum source distribution can be determined by analyzing the rank of the incident field matrix of the inverse problem. In addition, the introduction of scatterers into the model improved the source illumination and effectively increased the rank, enabling MDD to retrieve a better wavefield. We found that the ambiguity of the wavefield inferred from the model resolution matrix was a good measure of the amount of illumination of each receiver by the sources. We used the field data recorded at the two boreholes from the surface sources to support our results of the numerical modeling. We evaluated the rank of incident field matrix with the dense and sparse source distribution. We discovered that these two distributions resulted in an incident field matrix of almost the same rank and retrieved almost the same wavefield as the numerical modeling. This is crucial information for designing seismic experiments using the MDD-based approach.

Theoretical and experimental studies on broadband photoacoustic response of surface plasmon sensing

2020 ◽  
Vol 116 (24) ◽  
pp. 243504
Author(s):  
Wei Song ◽  
Sijie Xiao ◽  
Changjun Min ◽  
Hui Fang ◽  
Xiaocong Yuan
Keyword(s):  
Surface Plasmon ◽  
Experimental Studies

Numerical modeling and experimental studies of light pulse propagation in inhomogeneous random media

1993 ◽  
Author(s):  
Sten Madsen ◽  
Michael S. Patterson ◽  
Brian C. Wilson ◽  
Satish M. Jaywant ◽  
Andreas Othonos
Keyword(s):  
Numerical Modeling ◽  
Light Pulse ◽  
Random Media ◽  
Pulse Propagation ◽  
Experimental Studies

Improvements in near-field optical performance using localized surface plasmon excitation by a scatterer-formed aperture

2003 ◽  
Vol 83 (6) ◽  
pp. 1083-1085 ◽  
Author(s):  
Kenji Tanaka ◽  
Hiroshi Hosaka ◽  
Kiyoshi Itao ◽  
Manabu Oumi ◽  
Takashi Niwa ◽  
...  
Keyword(s):  
Surface Plasmon ◽  
Near Field ◽  
Localized Surface Plasmon ◽  
Optical Performance ◽  
Plasmon Excitation ◽  
Surface Plasmon Excitation

scholarly journals ANALYSIS OF RHEOLOGICAL MODELS OF PROCESS OF SELF-FORMING OF GLUED WOODEN

2020 ◽  
Vol 16 (2) ◽  
pp. 94-100
Author(s):  
Vladislav Ponomarev ◽  
Galina Kashevarova
Keyword(s):  
Plastic Deformation ◽  
Numerical Modeling ◽  
Moisture Content ◽  
Rheological Model ◽  
Experimental Studies ◽  
Rheological Models ◽  
Model Experiments ◽  
Promising Technology ◽  
Expansion Coefficients ◽  
Elastic And Plastic Deformation

The article considers a promising technology for self-shaping glued wooden elements of curved forms. This method is based on rheological processes occurring in wood, such as dehumidification and swelling of wood and its anisotropic properties. To predict the final curved shape of the wooden structure, the authors analyzed existing rheological models of wood and concluded that the rheological model proposed by European researchers includes the most complete list of factors that affect the process of deformation of wood: elastic and plastic deformation, drying and swelling of wood, deformation of viscous-elastic creep and mechanical sorption deformation. Based on the results of experimental studies and numerical modeling of the change in the curvature of glued wooden elements, which were made by European researchers, it was found that the proposed rheological model of wood needs to be clarified, namely, the correction of hygro-expansion coefficients depending on the moisture content of wood. A further direction of the authors’ research will be aimed at conducting model experiments to determine the hygro-expansion coefficients of different grades of wood depending on the thickness of the wooden elements and the orientation of the layers in the glued structure.

scholarly journals THE ANALISIS OF MERCURY EMISSIONS FROM «USOLYEKHIMPROM» INDUSTRIAL SITE

2021 ◽  
Vol 4 (1) ◽  
pp. 193-198
Author(s):  
Vladimir F. Raputa ◽  
Ruslana A. Amikishieva ◽  
Tatyana V. Yaroslavtseva
Keyword(s):  
Numerical Modeling ◽  
Numerical Analysis ◽  
Experimental Studies ◽  
Mercury Vapor ◽  
Soil Survey ◽  
Industrial Site ◽  
Mercury Emissions ◽  
Long Period ◽  
Light Impurities ◽  
Reconstruction Model

The numerical analysis of mercury pollution in the vicinity of the “Usoliekhimprom" industrial site and a territory of Usolye-Sibirskoye was held. The main centers of atmospheric influx of mercury vapor, which are located in the area of the sludge storage and the former mercury electrolysis workshop, were determined by the results of the soil survey. Asymptotic descriptions of the processes of transfer of light impurities from ground-based sources, taking into account the relative position of foci and observation points, were proposed. A reconstruction model of concentration fields over a long period of time for the dominant sources of plant was developed. The model was tested on biomonitoring data for 2019. Quite satisfactory agreement between the data of experimental studies of the content of mercury in poplar leaves with the results of numerical modeling was obtained. The ratios of contributions to pollution from different objects of the enterprise were calculated. Recommendations on the use of the reconstruction model to control rehabilitation measures at the Usoliekhimprom industrial site, which are currently being carried out, have been proposed.

Preliminary Optical Performance Analysis of the Space Interferometer Mission Using an Integrated Modeling Methodology

2000 ◽  
Author(s):  
Ipek Basdogan ◽  
Robert Grogan ◽  
Andy Kissil ◽  
Norbert Sigrist ◽  
Lisa Sievers
Keyword(s):  
System Design ◽  
System Modeling ◽  
Experimental Studies ◽  
Integrated Modeling ◽  
Optical Performance ◽  
Reaction Wheel ◽  
Space Interferometer ◽  
Modeling Methodology ◽  
Reference Design ◽  
The Impact

Abstract The Space Interferometer Mission (SIM) scheduled for launch in 2008, is one of the premiere missions in the Origins Program, NASA’s endeavor to understand the origins of the galaxies, of planetary systems around distant stars, and perhaps the origins of life itself. The precise tolerance required by the SIM instrument facilitates the investigation of many design options, trades, and methods for minimizing interaction between the actively controlled optics and the structure. One of the activities that addresses these technological challenges is the integrated modeling methodology development and validation at Jet Propulsion Laboratory (JPL). The methodology integrates structural, optical, and control system modeling into a common computational environment and enables end-to-end performance evaluation of complex optomechanical systems. This paper provides an overview of the integrated modeling methodology and introduces the most recent SIM Reference Design model. The SIM integrated model is used in system requirement trade studies and performance analyses to support the overall system design and ongoing error budget efforts. Optical performance in interferometry is typically measured in terms of optical pathlength difference (OPD) and differential wavefront tilt (DWT). This paper focuses on the OPD performance metric and investigates the OPD jitter resulting from reaction wheel assembly (RWA) disturbances. The RWA is the largest anticipated disturbance source on the spacecraft. Therefore, assessing the impact of the wheel disturbance frequency content and magnitude levels on the optical performance is essential for the success of the mission. Broadband and discrete frequency models of a reaction wheel are used to perform the disturbance analysis. The overall system design can benefit from such analysis results by identifying the critical regions in the frequency domain and decoupling the dynamics of the optical and structural components from the disturbance spectrum and the control bandwidth. The preliminary performance results show that the current SIM Reference Design meets the mission requirements with respect to RWA induced disturbances. However, some of the modeling assumptions and component models must be validated by experimental studies before the subsystem requirements are finalized.

A modern approach to the design of foreign landing parachute systems

2020 ◽  
Author(s):  
S.Yu. Ploskov
Keyword(s):  
Numerical Modeling ◽  
Vortex Formation ◽  
Experimental Studies ◽  
Modern Approach ◽  
Parachute System ◽  
Parachute Canopy ◽  
Payload Mass ◽  
The Stability ◽  
Definition Of ◽  
Expanded Concept

Landing parachute systems are among the most demanded samples of parachute equipment. The purpose of the study was to find new principles for developing parachutes with increased stability according to the analysis of the results of numerical and experimental studies of canopies of various shapes. The paper proposes to supplement a traditional definition of the stability of a parachute system with the obligatory consideration of the system’s ability to maintain a given trajectory of movement with a neutral canopy, regardless of the change in the payload mass. It is the expanded concept of stability that is taken as the basis of the modern approach to the design of foreign landing parachute systems. The study substantiates the main criteria for choosing the optimal cutting shape for parachute systems of increased stability of various types at the stage of preliminary design. The results of numerical modeling of canopies are presented: quarter-spherical, hemispherical, polyconic canopies and a T-11 type parachute canopy. Based on the analysis of these results, the study was first to propose a hypothesis that a decrease in the intensity of vortex formation in the wake leads to an increase in the stability of the parachute descent. The results of numerical modeling of canopies of various shapes, as well as experimental studies of a model polyconic parachute, which prove the correctness of the proposed hypothesis, are presented.

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