Introduction

Wißmann, P.; Finzel, Hans-Ulrich

doi:10.1007/3-540-48490-6_1

Cited by 3 publications

(11 citation statements)

References 6 publications

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“…Such films led to the clouding effect which limited their use in the infrared range. The deposition of films on the substrates was at a pressure of 9 × 10 −7 MB because aluminium films strongly adhere on the substrates when deposition is carried out at a pressure less than 10 −7 of atmospheric pressure, to avoid oxidation, and is used to prepare thin films with controlled chemical composition [28]. The vacuum deposition process was selected for the deposition of thin films over other processes such as electrochemical deposition and flame spraying.…”

Section: Aluminium Films On Ceramic Basesmentioning

confidence: 99%

The Effect of Thickness of Aluminium Films on Optical Reflectance

Lugolole

Obwoya

2015

Journal of Ceramics

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In Uganda and Africa at large, up to 90% of the total energy used for food preparation and water pasteurization is from fossil fuels particularly firewood and kerosene which pollute the environment, yet there is abundant solar energy throughout the year, which could also be used. Uganda is abundantly rich in clay minerals such as ball clay, kaolin, feldspar, and quartz from which ceramic substrates were developed. Aluminium films of different thicknesses were deposited on different substrates in the diffusion pump microprocessor vacuum coater (Edwards AUTO 306). The optical reflectance of the aluminium films was obtained using a spectrophotometer (SolidSpec-3700/DUV-UV-VIS-NIR) at various wave lengths. The analysis of the results of the study revealed that the optical reflectance of the aluminium films was above 50% and increased with increasing film thickness and wavelength. Thus, this method can be used to produce reflector systems in the technology of solar cooking and other appliances which use solar energy.

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Section: Aluminium Films On Ceramic Basesmentioning

confidence: 99%

The Effect of Thickness of Aluminium Films on Optical Reflectance

Lugolole

Obwoya

2015

Journal of Ceramics

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“…(1) γ * + n → γ * ′ + n ′ (2) which are illustrated by the diagrams of scattering due to electric fields acting on the magnetic moment (upper part) and polarizability diagram for electromagnetic scattering of a neutron in a Coulomb field (lower part). κ n : anomalous magnetic moment of the neutron.…”

Section: The Early History and Basic Ideasmentioning

confidence: 99%

“…The electric (α) and magnetic (β) polarizabilities are defined through the second-order effective Hamiltonian H (2) . Standard text books prefer the Gauss unit system [25] whereas modern particle physics prefers the Heaviside system.…”

Section: Polarizabilities Defined For Real and Quasi-real Photonsmentioning

confidence: 99%

“…where ρ el is the energy density due to the electric field, ρ mag the energy density due to the magnetic field and H (2) the energy change. The factor 4π indicates that the electromagnetic polarizabilities have originally been defined in the Gauss unit system.…”

Section: Polarizabilities Defined For Real and Quasi-real Photonsmentioning

confidence: 99%

“…Instead it may be considered as some intermediate status report written in a way that future researchers are given an easy access to the field. This work is facilitated by the fact that there are two other excellent recent reviews (i) the publication of Drechsel, Pasquini and Vanderhaeghen "Dispersion relations in real and virtual Compton scattering" [1] and the work of Wissmann "Compton Scattering: Investigating the structure of the nucleon with real photons" [2]. The work of Drechsel et al [1] emphasizes recent progress made in dispersion theories, the work of Wissmann [2] is concerned with experimental methods and recent experimental results and their evaluation and interpretation in terms of the nonsubtracted fixed-t dispersion theory.…”

Section: Introductionmentioning

confidence: 99%

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Polarizability of the nucleon and Compton scattering

Schumacher

2005

Progress in Particle and Nuclear Physics

112

196

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One of the central challenges of hadron physics in the regime of strong (non-perturbative) QCD is to identify the relevant degrees of freedom of the nucleon and to quantitatively explain experimental data in terms of these degrees of freedom. Among the processes studied so far Compton scattering plays a prominent role because of the well understood properties of the electromagnetic interaction. Different approaches to describe Compton scattering have been discussed up to now. It will be shown that the most appropriate ones are provided by nonsubtracted dispersion theories of the fixed-t and fixed-θ types, where the properties of these two versions are complementary so that advantage can be taken from both of them. In the frame of fixed-t dispersion theory it was possible to precisely reproduce experimental differential cross sections obtained for the proton in a wide angular range and for energies up to 1 GeV. At energies of the first resonance region and below, precise values for the electromagnetic polarizabilities and spin-polarizabilities have been determined for the proton and the neutron. As a summary we give the following recommended experimental values for the electromagnetic polarizabilities and backward spin-polarizabilities of the nucleon: α p = 12.0±0.6, β p = 1.9∓0.6, α n = 12.5±1.7, β n = 2.7∓1.8, in units of 10 −4 fm 3 and γ * Supported by Deutsche Forschungsgemeinschaft SPP(1034) and projects SCHU222 and 436RUS 113/510. Email address: mschuma3@gwdg.de (Martin Schumacher)

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A Multi-Objective Optimization of 2D Materials Modified Surface Plasmon Resonance (SPR) Based Sensors: An NSGA II Approach

Varasteanu

Kusko

2021

Applied Sciences

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Modifying the structure of surface plasmon resonance based sensors by adding 2D materials has been proven to considerably enhance the sensor’s sensitivity in comparison to a traditional three layer configuration. Moreover, a thin semiconductor film placed on top of the metallic layer and stacked together with 2D materials enhances even more sensitivity, but at the cost of worsening the plasmonic couplic strength at resonance (minimum level of reflectivity) and broadening the response. With each supplementary layer added, the complexity of optimizing the performance increases due to the extended parameter space of the sensor. This study focused on overcoming these difficulties in the design process of sensors by employing a multi-objective genetic algorithm (NSGA II) alongside a transfer matrix method (TMM) and, at the same time, optimizing the sensitivity to full width at half maximum (FWHM), and the reflectivity level at a resonance for a four layer sensor structure. Firstly, the thin semiconductor’s refractive index was optimized to obtain the maximum achievable sensitivity with a narrow FWHM and a reflectivity level at a resonance of almost zero. Secondly, it was shown that refractive indices of barium titanate (BaTiO3) and silicon (Si) are the closest to the optimal indices for the silver—graphene/WS2 and MoS2 modified structures, respectively. Sensitivities up to 302 deg/RIU were achieved by Ag–BaTIO3–graphene/WS2 configurations with an FWHM smaller than 8 deg and a reflectivity level less than 0.5% at resonance.

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Introduction

Cited by 3 publications

References 6 publications

The Effect of Thickness of Aluminium Films on Optical Reflectance

The Effect of Thickness of Aluminium Films on Optical Reflectance

Polarizability of the nucleon and Compton scattering

A Multi-Objective Optimization of 2D Materials Modified Surface Plasmon Resonance (SPR) Based Sensors: An NSGA II Approach

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