Bibliografías temáticas / Plasma Dispersion effect

Literatura académica sobre el tema "Plasma Dispersion effect"

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Publicado: 6 de septiembre de 2023
Última modificación: 7 de septiembre de 2023

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Artículos de revistas sobre el tema "Plasma Dispersion effect"

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KNELLER, M. y R. SCHLICKEISER. "Mode limitation and mode completion in collisionless plasmas". Journal of Plasma Physics 60, n.º 1 (agosto de 1998): 193–202. http://dx.doi.org/10.1017/s0022377898006485.

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The relativistically correct solution of the dispersion relation of linear plasma waves in an isotropic unmagnetized equilibrium electron plasma leads to two new effects unknown from the nonrelativistic dispersion theory. First, the number of damped subluminal modes is limited to a few (mode-limitation effect); secondly, for relativistic plasma temperatures the few individual modes complement each other in the sense that the dispersion relations ωR=ωR(k) continuously match each other (mode-completion effect). The second effect does not occur at nonrelativistic temperatures.
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Ribeiro, Ana I., Martina Modic, Uros Cvelbar, Gheorghe Dinescu, Bogdana Mitu, Anton Nikiforov, Christophe Leys et al. "Effect of Dispersion Solvent on the Deposition of PVP-Silver Nanoparticles onto DBD Plasma-Treated Polyamide 6,6 Fabric and Its Antimicrobial Efficiency". Nanomaterials 10, n.º 4 (26 de marzo de 2020): 607. http://dx.doi.org/10.3390/nano10040607.

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Polyvinylpyrrolidone-coated silver nanoparticles (PVP-AgNPs) dispersed in ethanol, water and water/alginate were used to functionalize untreated and dielectric barrier discharge (DBD) plasma-treated polyamide 6,6 fabric (PA66). The PVP-AgNPs dispersions were deposited onto PA66 by spray and exhaustion methods. The exhaustion method showed a higher amount of deposited AgNPs. Water and water-alginate dispersions presented similar results. Ethanol amphiphilic character showed more affinity to AgNPs and PA66 fabric, allowing better uniform surface distribution of nanoparticles. Antimicrobial effect in E. coli showed good results in all the samples obtained by exhaustion method but using spray method only the DBD plasma treated samples displayed antimicrobial activity (log reduction of 5). Despite the better distribution achieved using ethanol as a solvent, water dispersion samples with DBD plasma treatment displayed better antimicrobial activity against S. aureus bacteria in both exhaustion (log reduction of 1.9) and spray (methods log reduction of 1.6) due to the different oxidation states of PA66 surface interacting with PVP-AgNPs, as demonstrated by X-ray Photoelectron Spectroscopy (XPS) analysis. Spray method using the water-suspended PVP-AgNPs onto DBD plasma-treated samples is much faster, less agglomerating and uses 10 times less PVP-AgNPs dispersion than the exhaustion method to obtain an antimicrobial effect in both S. aureus and E. coli.
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3

SHOKRI, B. "The effect of quantum oscillation in plasmas". Journal of Plasma Physics 67, n.º 5 (junio de 2002): 329–37. http://dx.doi.org/10.1017/s0022377802001666.

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Making use of the dielectric permitivitty of a solid state plasma obtained from linearizing a quantum hydrodynamic equation, volume and surface waves in cold semibounded plasma-like media and thin layers of solid state plasmas are investigated in the presence and absence of an external magnetic field. It is shown that quantum oscillation of free charged particles and its spatial dispersion even in cold plasmas lead to new spectra of collective oscillations. Furthermore, a new volume ion-acoustic-type wave is obtained with a quadratic dependence on the wavenumber in the long-wavelength limit. Moreover, it is shown that quantum oscillation affects the surface wave spectrum and extends it to a wider frequency region.
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4

Ataei, Elahe, Mehdi Sharifian y Najmeh Zare Bidoki. "Magnetized plasma photonic crystals band gap". Journal of Plasma Physics 80, n.º 4 (9 de abril de 2014): 581–92. http://dx.doi.org/10.1017/s0022377814000105.

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In this paper, the effect of the magnetic field on one-dimensional plasma photonic crystal band gaps is studied. The one-dimensional fourfold plasma photonic crystal is applied that contains four periodic layers of different materials, namely plasma1–MgF2–plasma2–glass in one unit cell. Based on the principle of Kronig–Penney's model, dispersion relation for such a structure is obtained. The equations for effective dielectric functions of these two modes are theoretically deduced, and dispersion relations for transverse electric (TE) and transverse magnetic (TM) waves are calculated. At first, the main band gap width increases by applying the exterior magnetic field. Subsequently, the frequency region of this main band gap transfers completely toward higher frequencies. There is a particular upper limit for the magnitude of the magnetic field above which increasing the exterior magnetic field strength doesn't have any significant influence on the dispersion function behavior. (With an increase in incident angle up to θ1= 66°, the width of photonic band gap (PBG) changes for both TM/TE polarization.) With an increase in incident angle up to θ1= 66°, the width of PBG decreases for TM polarization and the width of PBG increases for TE polarization, but it increases with further increasing of the incident angle from θ1= 66° to 89° for both TE- and TM-polarizations. Also, it has been observed that the width of the photonic band gaps changes rapidly by relative difference of the two-plasma frequency. Results show the existence of several photonic band gaps that their frequency and dispersion magnitude can be controlled by the exterior magnetic field, incident angle, and two plasma frequencies. The result of this research would provide theoretical instructions for designing filters, microcavities, fibers, etc.
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5

Cheng, Li-Hong y Ju-Kui Xue. "Laser-electron interaction in plasma channel with dispersion effect". Journal of Physics: Conference Series 875 (julio de 2017): 022038. http://dx.doi.org/10.1088/1742-6596/875/3/022038.

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6

Pinhas, Hadar, Omer Wagner, Yossef Danan, Meir Danino, Zeev Zalevsky y Moshe Sinvani. "Plasma dispersion effect based super-resolved imaging in silicon". Optics Express 26, n.º 19 (14 de septiembre de 2018): 25370. http://dx.doi.org/10.1364/oe.26.025370.

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7

Zhu, Qi, Xin Ma, Xing Cao, Bin-Bin Ni, Zheng Xiang, Song Fu, Xu-Dong Gu y Yuan-Nong Zhang. "Assessment of applicability of cold plasma dispersion relation of slot region hiss based on Van Allen Probes observations". Acta Physica Sinica 71, n.º 5 (2022): 051101. http://dx.doi.org/10.7498/aps.71.20211671.

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Electron scattering caused by plasmapheric hiss is the dominant mechanism that is responsible for the formation of slot region (1.8 ≤ <i>L</i> ≤ 3) between the Earth’s inner and outer radiation belts. The cold plasma dispersion relation of plasmaspheric hiss is widely used to quantify its scattering effect on energetic electrons. However, the existence of hot plasmas in the realistic magnetospheric environment will modify the dispersion properties of plasmaspheric hiss. According to Van Allen Probes observations, we select all hiss events in the slot region and compare the observed hiss wave amplitudes with the converted hiss wave amplitudes deduced from cold plasma dispersion relation and electric field observations, and then study the dependence of the applicability of cold plasma dispersion relation of slot region hiss on spatial position and geomagnetic activity. The results show that the cold plasma approximation tends to overestimate the amplitude of slot region hiss. The difference between the observed amplitude and the converted hiss wave amplitude has a strong day night asymmetry. However, it shows a slight dependence on the level of geomagnetic activities. In addition, we find that the converted wave magnetic field intensity is significantly lower (higher) than the observed magnetic field intensity at lower frequencies (higher frequencies), which indicates that the cold plasma approximation generally overestimates (underestimates) the scattering effects of hiss waves on the lower (higher) energy electrons in the slot region. Our study confirms that the application scope of the cold plasma dispersion relation of slot hiss has strong spatial and frequency limitations, which is of great importance in deepening our understanding of the dynamic evolution of electrons in the slot region.
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MENGESHA, ALEMAYEHU y S. B. TESSEMA. "Effect of viscosity on propagation of MHD waves in astrophysical plasma". Journal of Plasma Physics 79, n.º 5 (25 de enero de 2013): 535–44. http://dx.doi.org/10.1017/s0022377813000020.

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AbstractWe determine the general dispersion relation for the propagation of magnetohydrodynamic (MHD) waves in an astrophysical plasma by considering the effect of viscosity with an anisotropic pressure tensor. Basic MHD equations have been derived and linearized by the method of perturbation to develop the general form of the dispersion relation equation. Our result indicates that an astrophysical plasma with an anisotropic pressure tensor is stable in the presence of viscosity and a strong magnetic field at considerable wavelength.
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9

Siddique, M., M. Jamil, A. Rasheed, F. Areeb, Asif Javed y P. Sumera. "Impact of Relativistic Electron Beam on Hole Acoustic Instability in Quantum Semiconductor Plasmas". Zeitschrift für Naturforschung A 73, n.º 2 (26 de enero de 2018): 135–41. http://dx.doi.org/10.1515/zna-2017-0275.

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AbstractWe studied the influence of the classical relativistic beam of electrons on the hole acoustic wave (HAW) instability exciting in the semiconductor quantum plasmas. We conducted this study by using the quantum-hydrodynamic model of dense plasmas, incorporating the quantum effects of semiconductor plasma species which include degeneracy pressure, exchange-correlation potential and Bohm potential. Analysis of the quantum characteristics of semiconductor plasma species along with relativistic effect of beam electrons on the dispersion relation of the HAW is given in detail qualitatively and quantitatively by plotting them numerically. It is worth mentioning that the relativistic electron beam (REB) stabilises the HAWs exciting in semiconductor (GaAs) degenerate plasma.
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CHISTYAKOV, M. V. y D. A. RUMYANTSEV. "COMPTON EFFECT IN STRONGLY MAGNETIZED PLASMA". International Journal of Modern Physics A 24, n.º 20n21 (20 de agosto de 2009): 3995–4008. http://dx.doi.org/10.1142/s0217751x09043018.

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The process of Compton scattering γe± → γe± in strongly magnetized hot and cold electron–positron plasma is considered. The analytical expressions for the partial cross-sections in rarefied plasma and the simple expressions for the photon absorption rates in degenerate plasma are obtained. The numerical estimations of the absorption rates for various scattering channels are presented taking into account of the photon dispersion and wave function renormalization in strong magnetic field and plasma. The comparison of the scattering absorption rate with photon splitting probability shows the existence of plasma parameters range where these values are comparable with each other.
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Tesis sobre el tema "Plasma Dispersion effect"

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Liao, Ling. "High speed silicon-on-insulator optical modulators based on the free carrier plasma dispersion effect". Thesis, University of Surrey, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493010.

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Silicon-based optoelectronic integrated circuits for future communications and interconnect applications require high speed silicon (Si) optical modulators with GHz and tens of GHz bandwidth. The design, fabrication, and performance of three Si waveguide modulators meeting this speed criterion are presented in this thesis.
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2

Lanier, Steven t. "Dynamic Screening via Intense Laser Radiation and Its Effects on Bulk and Surface Plasma Dispersion Relations". Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1011758/.

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Recent experimentation with excitation of surface plasmons on a gold film in the Kretschmann configuration have shown what appears to be a superconductive effect. Researchers claimed to see the existence of electron pairing during scattering as well as magnetic field repulsion while twisting the polarization of the laser. In an attempt to explain this, they pointed to a combination of electron-electron scattering in external fields as well as dynamic screening via intense laser radiation. This paper expands upon the latter, taking a look at the properties of a dynamic polarization function, its effects on bulk and surface plasmon dispersion relations, and its various consequences.
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3

Snipes, Erica K. "Measurements of finite dust temperature effects in the dispersion relation of the dust acoustic wave". Wittenberg University Honors Theses / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=wuhonors1242224221.

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4

Serrano, Raquel. "Matrix effects in plasma-based spectroscopic techniques (ICP-AES/MIP-AES): application to the analysis of environmental samples". Doctoral thesis, Universidad de Alicante, 2019. http://hdl.handle.net/10045/112487.

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La determinación de metales y metaloides en muestras medioambientales se suele realizar mediante técnicas de Espectrometría Atómica debido a su: (i) exactitud y precisión; (ii) sensibilidad; (iii) límites de detección del orden de los µg kg-1 - ng kg-1; (iv) velocidad de análisis; y (iv) capacidad multielemental para determinar varios analitos de forma simultánea. No obstante, el análisis de muestras medioambientales mediante estas técnicas no está exento de dificultades ya que la matriz de este tipo de muestras (p. ej. sales, materia orgánica, etc.), así como los reactivos empleados durante el pretratamiento de muestra (p. ej. ácidos, disolventes orgánicos, etc.), pueden dar lugar a interferencias (espectrales y no espectrales) que afecten negativamente a la exactitud y precisión de los análisis. A pesar de los numerosos estudios realizados hasta la fecha, existe todavía un gran desconocimiento sobre el origen de los efectos de matriz en las técnicas de Espectrometría Atómica y, en particular, para la Espectrometría de Emisión Atómica de Plasma Acoplado Inductivamente (ICP-AES) y la Espectrometría de Emisión Atómica de Plasma Inducido por Microondas (MIP-AES). En la presente Tesis Doctoral se han estudiado los efectos de matriz derivados de los concomitantes más habituales en el análisis de muestras medioambientales (sales, ácidos y carbono) sobre la señal de emisión en ICP-AES y MIP-AES y, a partir de la información obtenida, se han desarrollado diferentes métodos analíticos para la determinación de metales y metaloides en muestras medioambientales libres de interferencias. En primer lugar, se ha investigado la influencia del C sobre la señal de emisión (atómica e iónica) en ICP-AES para 62 elementos y sus posibles implicaciones prácticas al analizar muestras medioambientales. A partir de los conocimientos obtenidos, se ha desarrollado un método analítico para evaluar el papel de la Cymodocea nodosa en la movilización de elementos traza en el ecosistema marino de una de las regiones más afectadas por la industria minera en el entorno de la laguna costera del Mar Menor (Murcia). Por otro lado, se ha investigado de forma sistemática interferencias (espectrales y no espectrales) producidas por matrices de tipo salino (CaNO3), ácido (H2SO4) y orgánico (glicerol, cloroformo y un disolvente supramolecular basado en THF y 1-decanol) sobre la señal analítica en MIP-AES. Finalmente, a partir de los resultados obtenidos, se ha desarrollado una metodología analítica para la determinación de Cd en aguas utilizando de forma conjunta la microextracción dispersiva líquido-líquido (DLLME) y MIP-AES.
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De, Rubeis Emanuele. "Campi magnetici in astrofisica". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21207/.

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I campi magnetici nel nostro Universo ricoprono un fondamentale ruolo nella nascita e nello sviluppo delle strutture cosmiche così come noi le osserviamo. Si pensi ad esempio ad oggetti "comuni" in ambito astrofisico che presentano un magnetismo "proprio", stelle, pianeti, galassie, o a fenomeni come i venti stellari, i getti nei nuclei galattici attivi, le aurore osservate da Terra: essi hanno una precisa morfologia ed evoluzione che dipende fortemente dalla struttura dei campi magnetici che sono ivi presenti. Eppure, nonostante la notevole importanza e onnipresenza, non si hanno ancora certezze sulla loro origine specialmente su larga scala, per cui rimangono aperti numerosi interrogativi e teorie a riguardo. Data l'enorme varietà di ambiti toccati dai fenomeni magnetici, la seguente tesi non affronta con completezza ogni singolo argomento ad essi legato. Nella prima parte di questa trattazione viene illustrato il comportamento del plasma magnetizzato introducendo i principi della magnetoidrodinamica (Capitolo 1), per poi passare alla seconda parte in cui invece vengono esposti i principali effetti astrofisici che permettono di misurare (o stimare) l'intensità del campo magnetico e di studiarne la morfologia. Si parla pertanto del principale meccanismo di emissione dovuto al magnetismo, ovvero la radiazione di sincrotrone (Capitolo 2), della propagazione di onde elettromagnetiche in un plasma con particolare riferimento alla rotazione di Faraday (Capitolo 3), valutando la misura di dispersione e di rotazione, e infine dell'effetto Zeeman (Capitolo 4) considerando anche la presenza di un campo magnetico interno alla particella. Nel capitolo dedicato al sincrotrone vi è poi un esempio astrofisico basato su una radiosorgente, J1511+0518, che espone le possibilità di utilizzo della condizione di equipartizione per la determinazione del campo magnetico di queste particolari strutture.
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Djebali, Ridha. "Simulation et modélisation des transferts dans les milieux multiphases et multiconstituants par une approche Boltzmann sur réseau". Limoges, 2011. https://aurore.unilim.fr/theses/nxfile/default/0c924101-f7db-4449-a0c9-7465ccfd34ec/blobholder:0/2011LIMO4035.pdf.

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Ces travaux de thèse portent sur l'étude du procédé de projection par plasma d'arc soufflé par l'approche Boltzmann sur réseau, LBM. Un modèle LBM axisymétrique turbulent a été développé, et a servi à la simulation d'un jet de plasma d'argon pure et d'un mélange d'argon-azote. Les résultats qui en découlent sont en excellent accord avec les résultats expérimentaux et numériques de références. Une formulation Lagrangiènne a été adoptée pour l'étude du phénomène de transport de particules eu projection et des transferts plasma-particules durant leurs séjours dans le gaz chaud. La validation, basée sur les histoires dynamique et thermique de particules de zircone ZrO2 et d'alumine Al2O3, a prouvé une très bonne performance de notre modèle par comparaison au code "Jets&Poudres". L'accent a été ensuite nus sur l'effet de la dispersion à l'injection de poudre d'alumine sur le comportement dynamique et thermique de particules eu vol. Nous avons conclu que l'interaction entre ces paramètres résulte en un champ de projection plus réaliste et que les paramètres d'arrivée (à l’impact sur le substrat) sont raisonnables. Nous concluons sur l'efficacité et l'efficience de la méthode LBM de rendre bien compte de la physique des milieux multiphases et multiconstituants sous conditions extrêmes, dont fait partir la projection thermique
In this thesis, we study the plasma spraying process by the help of the lattice Boltzmann approach. LBM. A LB turbulent axisymetric model has been developed and used to simulate a plasma jet flow of pure argon and argon-nitrogen mixture. The present findings are in excellent agreement with previous experimental and numerical results. A Lagrangian formulation was adopted to study the plasma-powder interactions (phenomenon of transport and transfers during the stay in the hot gas). Validation based on the dynamic and thermal stories of zirconia ZrO2 and alumina Al2O3 particles showed the good performance of the present spraying model compared with the "Jets & Poudres" code. Emphasis was, then, put on the effects of dispersions in injection of alumina powder on the dynamic and thermal behavior of in-flight particles. We concluded that the interaction of these parameters results in a more realistic projection field and the arrival parameters (at the impact on the substrate) are reasonable. We conclude on the effectiveness and efficiency of the LBM method to well account of the physics of multiphase and multicomponent media under extreme conditions, which include thermal spraying processes
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7

Mussard, Bastien. "Modélisation quantochimiques des forces de dispersion de London par la méthode des phases aléatoires (RPA) : développements méthodologiques". Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0292/document.

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Dans cette thèse sont montrés des développements de l'approximation de la phase aléatoire (RPA) dans le contexte de théories à séparation de portée. On présente des travaux sur le formalisme de la RPA en général, et en particulier sur le formalisme "matrice diélectrique" qui est exploré de manière systématique. On montre un résumé d'un travail sur les équations RPA dans le contexte d'orbitales localisées, notamment des développements des orbitales virtuelles localisées que sont les "orbitales oscillantes projetées" (POO). Un programme a été écrit pour calculer des fonctions telles que le trou de d'échange, la fonction de réponse, etc... sur des grilles de l'espace réel (grilles parallélépipédiques ou de type "DFT"). On montre certaines de ces visualisations. Dans l'espace réel, on expose une adaptation de l'approximation du dénominateur effectif (EED), développée originellement dans l'espace réciproque en physique du solide. Également, les gradients analytiques des énergies de corrélation RPA dans le contexte de la séparation de portée sont dérivés. Le formalisme développé ici à l'aide d'un lagrangien permet une dérivation tout-en-un des termes courte- et longue-portée qui émergent dans les expressions du gradient, et qui montrent un parallèle intéressant. Des applications sont montrées, telles que des optimisations de géométries aux niveaux RSH-dRPA-I et RSH-SOSEX d'un ensemble de 16 petites molécules, ou encore le calcul et la visualisation des densités corrélées au niveau RSH-dRPA-I
In this thesis are shown developments in the random phase approximation (RPA) in the context of range-separated theories. We present advances in the formalism of the RPA in general, and particularly in the "dielectric matrix" formulation of RPA, which is explored in details. We show a summary of a work on the RPA equations with localized orbitals, especially developments of the virtual localized orbitals that are the "projected oscillatory orbitals" (POO). A program has been written to calculate functions such as the exchange hole, the response function, etc... on real space grid (parallelepipedic or of the "DFT" type) ; some of those visualizations are shown here. In the real space, we offer an adaptation of the effective energy denominator approximation (EED), originally developed in the reciprocal space in solid physics. The analytical gradients of the RPA correlation energies in the context of range separation has been derived. The formalism developed here with a Lagrangian allows an all-in-one derivation of the short- and long-range terms that emerge in the expressions of the gradient. These terms show interesting parallels. Geometry optimizations at the RSH-dRPA-I and RSH-SOSEX levels on a set of 16 molecules are shown, as well as calculations and visualizations of correlated densities at the RSH-dRPA-I level
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8

Yu-ChunChang y 張煜群. "Design and Fabrication of the1x2 MMI-Based MZI Optical Modulators on SOS (Silicon-On-Silicon) and SOI (Silicon-On-Insulator) Utilizing the Plasma Dispersion Effect". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/28323918650158870671.

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碩士
國立成功大學
微電子工程研究所碩博士班
98
In this thesis, the attention is focused on an electrooptic Si-based modulator working at 1.55μm. The spin-on-dopant (SOD) thermal diffusion method was adopted to fabricate the optical modulator based on the p+-i-n+ structure. The advantages of using the SOD process include low cost and simplicity, and this very technique is therefore highly suitable to be used as an substitute for the conventional ion implantation. In addition, the SOD method is also compatible with the standard CMOS process. On the device side, the 1 x 2 multimode interference (MMI) based Mach-Zehnder (MMI-MZI) modulators on silicon-on-silicon (SOS) substrates operating at 1.55μm were designed and simulated using the numerical beam propagation method (BPM), before subjecting the final design for device fabrication. It was later realized that the signal modulation by current injection led to two competitive modulation mechanisms in play, namely, the thermo-optic and plasma dispersion effects. Consequently, two opposing mechanisms would bring about the opposite refractive index changes. The aforementioned modulators with different modulation lengths being tested would eventually render the modulation depth closes to 100% and 3dB frequency response up to 336.5 kHz. Furthermore, the same devices mentioned previously were also fabricated and later tested on silicon-on-insulator (SOI) substrates for performance comparison. The experimental results demonstrate that a nearly 100% modulation depth was achieved for modulators with different modulation lengths, and only 0.2 W of input power was needed for devices to reach first phase shift. Finally, the devices on SOI substrates operated significantly faster in terms of signal modulation as the rise/fall times smaller than 50 ns and the 3dB cutoff frequency of greater than 5 MHz were measured, outright showing that the signal modulation was dominated by plasma dispersion effect.
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Sur, Soutik. "Investigation of Optical and Electro-optical Effects at Material Interfaces". Thesis, 2023. https://etd.iisc.ac.in/handle/2005/6187.

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The key questions addressed in this thesis are related to light-matter interactions at the material interfaces and are related to both plasmonic as well as Pockels effects. Plasmonics enables the design of compact photonic circuits with sub-micron electric field confinements and authorizes optical signal processing at the nanoscale. At the same time, the Pockels effect is necessary for designing on-chip interferometers and ultra-high-speed modulators. These two are crucial for integrated optics and photonics engineering. Integrated optics deals with miniaturizing large-scale optical signal processing circuit functionalities on a small footprint. This leads to performance enhancement as well as low power consumption. An electro-optic modulator is one of the most integral parts of an integrated photonic circuit. LiNbO3 is a well-known material with asymmetric crystal symmetry with a high Pockels coefficient of around 40 pm/V. However, integrating asymmetric crystals on a chip leads to slow and expensive fabrication processes. Instead, considering amorphous and poly-crystalline materials, their fabrication procedure is cost-effective and can be deposited rapidly using solution-processed techniques. In the first part of this thesis, we present an observation of the Pockels effect at the interface of a sol-gel spin-coated amorphous titanium dioxide and a poly-crystalline metal. We have found nonlinear two-dimensional susceptibility χ2D(2)(omega; omega, 0) at the interface of these materials of the order of 10^7pm^2/V. The order of magnitude is similar to a recent report of χsurface(2)(2ω; ω, ω)~ 10^6pm^2/V for the silicon-air interface. This work presents the interface of centrosymmetric TiO2 and metal as a new electro-optic material. In the next part, we argue the possibility of free carrier absorption as the probable physics instead of the pure field Pockels in the observations regarding the electro-optic effect described in the beginning. We study theoretical models expressing the dependence of free carrier absorption and dispersion on the mobility of the medium. We note a quench in free carrier absorption for very low mobilities. Since our TiO2 dielectric is amorphous and has low measured mobility, we reject the free carrier absorption as a possibility. However, the plasma dispersion effect can dominate at higher mobilities. We then describe a mechanism to inject and modulate carriers up to 10^19 cm^-3 in high mobility. (μ≥ 1 cm^2V^-1s^-1) TiO2 with low intrinsic carrier concentration using ohmic contacts. Finally, we study these electro-modulated devices' optical properties using the transfer matrix method. It is possible to confine electromagnetic radiation at the interface of a metal and dielectric to nanoscale by converting it into surface plasmon polariton (SPPs). The SPPs are excellent tools for studying TiO2 and metal interface's electro-optical properties. In the last part of the thesis, we study the temporal coherence properties of these SPPs propagating on the surface of a metal and a dielectric. Despite the heavy loss, the coherence properties of the SPPs are preserved. We experimentally demonstrate this conservation of coherence up to 80 μm of propagation. Ultimately, we propose a miniaturized design of a plasmonic electro-optic modulator with TiO2 as dielectric.
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10

"Effects of nonlinear media and external static magnetic field on surface plasmon dispersion relation". 2014. http://repository.lib.cuhk.edu.hk/en/item/cuhk-1291639.

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Li, Ming Yip = 非線性介質和外加靜態磁場對表面等離子色散關係的影響 / 李銘業.
Thesis M.Phil. Chinese University of Hong Kong 2014.
Includes bibliographical references (leaves 88-91).
Abstracts also in Chinese.
Title from PDF title page (viewed on 01, November, 2016).
Li, Ming Yip = Fei xian xing jie zhi he wai jia jing tai ci chang dui biao mian deng li zi se san guan xi de ying xiang / Li Mingye.
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Libros sobre el tema "Plasma Dispersion effect"

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Buhmann, Stefan Yoshi. Dispersion Forces II: Many-Body Effects, Excited Atoms, Finite Temperature and Quantum Friction. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012.

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2

Solymar, L., D. Walsh y R. R. A. Syms. The electron as a particle. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198829942.003.0001.

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Describes the classical properties of electrons, starting with a discussion of fundamental phenomena such as drift, the hydrodynamic model, and the Hall effect. After that there is an excursion into electromagnetic theory, deriving the dispersion equation and showing that materials containing electrons may become transparent above a certain frequency. The effect of the magnetic field is studied by introducing cyclotron waves. There are further sections on plasmas, heat, and the fundamentals of Johnson noise.
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Capítulos de libros sobre el tema "Plasma Dispersion effect"

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del Castillo-Mussot, M., W. L. Mochán y R. G. Barrera. "Effect of Plasma Waves on the Dispersion Relation of Conductor-Insulator Superlattices". En Lectures on Surface Science, 28–31. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-71723-9_2.

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2

Mazur, V. A. y A. V. Stepanov. "Concerning the Dynamics of Energetic Protons in Coronal Magnetic Loops: Dispersion Effects of Alfven Waves". En Unstable Current Systems and Plasma Instabilities in Astrophysics, 559. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-6520-1_65.

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Singh, Sukhmander, Bhavna Vidhani, Sonia Yogi, Ashish Tyagi, Sanjeev Kumar y Shravan Kumar Meena. "Plasma Waves and Rayleigh–Taylor Instability: Theory and Application". En Plasma Science - Recent Advances, New Perspectives and Applications [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.109965.

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The presence of plasma density gradient is one of the main sources of Rayleigh–Taylor instability (RTI). The Rayleigh–Taylor instability has application in meteorology to explain cloud formations and in astrophysics to explain finger formation. It has wide applications in the inertial confinement fusion to determine the yield of the reaction. The aim of the chapter is to discuss the current status of the research related to RTI. The current research related to RTI has been reviewed, and general dispersion relation has been derived under the thermal motion of electron. The perturbed densities of ions and electrons are determined using two fluid approach under the small amplitude of oscillations. The dispersion equation is derived with the help of Poisson’s equation and solved numerically to investigate the effect of various parameters on the growth rate and real frequency. It has been shown that the real frequency increases with plasma density gradient, electron temperature and the wavenumber, but magnetic field has opposite effect on it. On the other hand, the growth rate of instability increases with magnetic field and density gradient, but it decreases with electron temperature and wave number.
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Bejaoui, Marouene, Hanen Oueslati y Haykel Galai. "Ternary Solid Dispersion Strategy for Solubility Enhancement of Poorly Soluble Drugs by Co-Milling Technique". En Chitin and Chitosan - Physicochemical Properties and Industrial Applications [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.95518.

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Amorphous ternary solid dispersion has become one of the strategies commonly used for improving the solubility and bioavailability of poorly water soluble drugs. Such multicomponent solid dispersion can be obtained by different techniques, this chapter provides an overview of ternary solid dispersion by co-milling method from the perspectives of physico-chemical characteristics in vitro and in vivo performance. A considerable improvement of solubility was obtained for many active pharmaceutical ingredients (e.g., Ibuprofen, Probucol, Gliclazid, Fenofibrate, Ibrutinib and Naproxen) and this was correlated to the synergy of multiple factors (hydrophilicity enhancement, particle size reduction, drug-carrier interactions, anti-plasticizing effect and complexation efficiency). This enhanced pharmacokinetic properties and bioavailability of these drug molecules (1.49 to 15-folds increase in plasma drug concentration). A particular focus was accorded to compare the ternary and binary system including Ibuprofen and highlighting the contribution of thermal and spectral characterization techniques. The addition of polyvinylpyrrolidone (PVP K30), a low molecular weight molecule, into the binary solid dispersion (Ibuprofen/β-cyclodextrin), leads to a 1.5–2 folds increase in the drug intrinsic dissolution rate only after 10 min. This resulted from physical stabilization of amorphous Ibuprofen by reducing its molecular mobility and inhibiting its recristallization even under stress conditions (75% RH and T = 40°C for six months).
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Kenyon, Ian R. "Electrons in solids". En Quantum 20/20, 75–94. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198808350.003.0005.

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Electron energy bands in solids are introduced. Free electron theory for metals is presented: the Fermi gas, Fermi energy and temperature. Electrical and thermal conductivity are interpreted, including the Wiedermann–Franz law. The Hall effect and information it brings about charge carriers is discussed. Plasma oscillations of conduction electrons and the optical properties of metals are examined. Formation of quasi-particles of an electron and its screening cloud are discussed. Electron-electron and electron-phonon scattering and how they affect the mean free path are treated. Then the analysis of crystalline materials using electron Bloch waves is presented. Tight and weak binding cases are examined. Electron band structure is explained including Brillouin zones, electron kinematics and effective mass. Fermi surfaces in crystals are treated. The ARPES technique for exploring dispersion relations is explained.
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Ali, Shahid y Ioannis Kourakis. "Wakefield Formation Due to a Short Electron Beam in Quantum Nanowires". En Emerging Developments and Applications of Low Temperature Plasma, 1–33. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-7998-8398-2.ch001.

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The basic properties of classical and quantum plasmas are discussed. Quantum plasmas behave differently due to high densities and low temperatures at nanometer scale in contrast to classical ones which are characterized by low densities and high temperatures. A literature survey is made to investigate the plasma phenomenon with quantum mechanical effects. Classical and quantum viewpoints are also presented to understand the free electron gas in metals. In particular, the excitation of stable plasmon wakefield is studied due to a short electron pulse propagating in axial direction of nanowire. The latter contains degenerate electrons and classical static ions. By using the Trivelpiece-Gould configuration and Fourier transform techniques, a general dispersion is obtained for the electrostatic plasmons and analyzed numerically. Nevertheless, an evolution equation for the wakefield is derived and carried out the stability analysis. In a gold nanowire, the amplitudes of wakefield become significantly modified by the variation of quantum diffraction, quantum exchange-correlations and mode quantization in the radial direction. The present findings may prove useful for investigating new radiation sources in the extreme-ultraviolet range.
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Rasouli, Milad, Nadia Fallah y Kostya (Ken) Ostrikov. "Lung Cancer Oncotherapy through Novel Modalities: Gas Plasma and Nanoparticle Technologies". En Lung Cancer - Modern Multidisciplinary Management. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.95494.

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Cold atmospheric pressure plasma (CAP) is emerging as new healthcare technology and it has a high potential through physical and chemical effects for cancer treatment. Recently, CAP, plasma activated liquid (PAL), and nanomaterial have been significant advances in oncotherapy. Reactive oxygen-nitrogen species (RONS), electrical field, and other agents generated by CAP interact with cells and induce selective responses between the malignant and normal cells. Nanomedicine enhances therapeutic effectiveness and decreases the side effects of traditional treatments due to their target delivery and dispersion in tumor tissue. There are various nanocarriers (NCs) which based on their properties can be used for the delivery of different agents. The combination of gas plasma and nanomaterials technologies is a new multimodal treatment in cancer treatment, therefore, is expected that the conjunction of these technologies addresses many of the oncology challenges. This chapter provides a framework for current research of NC and gas plasma therapies for lung cancer. Herein, we focus on the application of gas plasmas and nanotechnology to drug and gene delivery and highlight several outcomes of its. The types and features of the mentioned therapeutics strategy as novel classes for treating lung cancer individually and synergistic were examined.
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Adams, Charles S. y Ifan G. Hughes. "Light and matter". En Optics f2f, 213–32. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198786788.003.0013.

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This chapter considers the interaction between light and electrons in matter. The microscopic origins of refraction and dispersion are highlighted, as are the optical properties of metals and plasmas, and the effects of a non-linear optical response.
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Kaothekar, Sachin. "Transverse Thermal Instability of Radiative Plasma with FLR Corrections for Star Formation in ISM". En Plasma Science and Technology [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.99924.

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Impact of porosity, rotation and finite ion Larmor radius (FLR) corrections on thermal instability of immeasurable homogeneous plasma has been discovered incorporating the effects of radiative heat-loss function and thermal conductivity. The general dispersion relation is carried out with the help of the normal mode analysis scheme taking the suitable linearized perturbation equations of the difficulty. This general dispersion relations is further reduces for rotation axis parallel and perpendicular to the magnetic field. Thermal instability criterion establishes the stability of the medium. Mathematical calculations have been performed to represent the impact of different limitations on the growth rate of thermal instability. It is found that rotation, FLR corrections and medium porosity stabilize the growth rate of the medium in the transverse mode of propagation. Our outcome of the problem explains that the rotation, porosity and FLR corrections affect the dens molecular clouds arrangement and star configuration in interstellar medium.
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10

A. Akinyemi, Segun, Olajide F. Adebayo, Henry Y. Madukwe, Adeyinka O. Aturamu y Olusola A. OlaOlorun. "Mineralogy and Geochemistry of Shales of Mamu Formation in Nigeria: Effects of Deposition, Source Rock, and Tectonic Background". En Geochemistry and Mineral Resources. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.102454.

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Study of lithofacies identification, geochemical characterization of shales is vital to the provenance, paleoweathering, and tectonic setting reconstruction. The combination of morphological analysis, bulk chemical analysis and in-situ multi-element analysis was used to investigate the provenance, source area weathering, and depositional setting of outcropped Maastrichtian shale sequence of the Mamu Formation, Anambra Basin in Nigeria. Ten representative shale samples were examined by scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS). Geochemical analysis was performed by X-ray fluorescence (XRF) Spectroscopy and Laser Ablation-Induced Coupled Plasma Mass Spectrometry (LA-ICPMS) techniques. The structural and morphological development of kaolinite in the outcropped shale samples of Mamu Formation is due to mechanical disintegration during transportation and re-deposition. Major oxides such as SiO2, Al2O3 and Fe2O3 constitute greater than 86% of the bulk composition. The weathering indices suggest highly weathered source materials. The plot of Cr versus Ni indicated the studied samples are Late Archean shale. Binary plots of trace elements suggest derivation from acidic or felsic sources rather than intermediate or basic source rocks. Ternary plot of Na2O + K2O, SiO2/10 and CaO + MgO indicated multiple sources such as felsic igneous rocks or recycled residues of quartz-rich. Tectonic discrimination diagram depict a typical Passive Margin field.
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Actas de conferencias sobre el tema "Plasma Dispersion effect"

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Tiferet, Maor, Hadar Pinhas, Omer Wagner, Yossef Danan, Meir Danino, Zeev Zalevsky y Moshe Sinvani. "Plasma dispersion effect based super-resolved imaging in silicon". En Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XVI, editado por Dan V. Nicolau, Dror Fixler y Ewa M. Goldys. SPIE, 2019. http://dx.doi.org/10.1117/12.2508535.

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Pinhas, Hadar, Yossef Danan, Moshe Sinvani, Meir Danino y Zeev Zalevsky. "STED like microscopy based on plasma dispersion effect in silicon". En Computational Optical Sensing and Imaging. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/cosi.2017.cth3b.5.

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Noorden, Ahmad Fakhrurrazi Ahmad, Suzairi Daud y Jalil Ali. "Implication of plasma dispersion effect for controlling refractive index in microresonator". En INTERNATIONAL CONFERENCE ON PLASMA SCIENCE AND APPLICATIONS (ICPSA 2016). Author(s), 2017. http://dx.doi.org/10.1063/1.4978819.

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Perez-Galacho, Diego, Delphine Marris-Morini, Eric Cassan, Charles Baudot, Jean-Marc Fedeli, Segolene Olivier, Frederic Boeuf y Laurent Vivien. "Comparison among Silicon modulators based on Free-Carrier Plasma Dispersion Effect". En 2015 17th International Conference on Transparent Optical Networks (ICTON). IEEE, 2015. http://dx.doi.org/10.1109/icton.2015.7193697.

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Almeida, V. R., Qianfan Xu y M. Lipson. "Temperature-insensitive ultrafast optical integrated semiconductor switch based on plasma-dispersion effect". En 2005 Conference on Lasers and Electro-Optics (CLEO). IEEE, 2005. http://dx.doi.org/10.1109/cleo.2005.202212.

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Gardes, F. Y., G. T. Reed, A. P. Knights y G. Mashanovich. "Evolution of optical modulation using majority carrier plasma dispersion effect in SOI". En Integrated Optoelectronic Devices 2008, editado por Joel A. Kubby y Graham T. Reed. SPIE, 2008. http://dx.doi.org/10.1117/12.765258.

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Hodson, T., B. Miao, C. Chen, A. Sharkawy y D. Prather. "Silicon Based Photonic Crystal Electro-optic Modulator Utilizing the Plasma Dispersion Effect". En CLEO '07. 2007 Conference on Lasers and Electro-Optics. IEEE, 2007. http://dx.doi.org/10.1109/cleo.2007.4452748.

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Yang, Wei, Kun Wang, Yun Chen, Jingyi Yan, Chuansheng Zhang, Fei Kong y Tao Shao. "Effect of plasma modification on the dispersion of high thermal conductive nano-filler". En 2022 IEEE 5th International Electrical and Energy Conference (CIEEC). IEEE, 2022. http://dx.doi.org/10.1109/cieec54735.2022.9846111.

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Danan, Yossef, Tali Ilovitsh, Danping Liu, Hadar Pinhas, Moshe Sinvani, Yehonatan Ramon, Jonathan Azougi, Alexandre Douplik y Zeev Zalevsky. "Plasma dispersion effect assisted nanoscopy based on tuning of absorption and scattering resonances of nanoparticles". En SPIE BiOS, editado por Alexander N. Cartwright, Dan V. Nicolau y Dror Fixler. SPIE, 2016. http://dx.doi.org/10.1117/12.2210800.

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Hosseini, Seyedreza y Kambiz Jamshidi. "Fundamental peformance tradeoffs for reverse biased free carrier plasma dispersion effect based silicon optical modulators". En 2015 International Conference on Photonics in Switching (PS). IEEE, 2015. http://dx.doi.org/10.1109/ps.2015.7328998.

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