Irina PAIVA-VERETENNICOFF | Vrije Universiteit Brussel (original) (raw)
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Papers by Irina PAIVA-VERETENNICOFF
It is a great but difficult task to give an overview of the research in Quantum Electronics (QE) ... more It is a great but difficult task to give an overview of the research in Quantum Electronics (QE) taking place in Belgium in the present days. There are many reasons for this. First because the field has become so broad that it has ramifications in many of the domains belonging to the other IUPAP commissions and we have to avoid overlaps in the different presentations. Second, because the fundamental research in QE has lead to exciting real life and science fiction type of applications, with tremendous impact on society: it would be worth the while to spend some time on some specific applications, but cannot be done here. Third, because QE has become genuinely multidisciplinary: the topic evolved from fundamental solid state quantum physics to a discipline where physics works at the edge or is truly within material science, electrical engineering , information science and in some cases – within life sciences. And last but not least because, thanks to the continuous support of the Com...
Bulletin de la Classe des sciences, 1971
Balescu Radu, Paiva-Veretennicoff I. Correlation patterns for an electromagnetic field interactin... more Balescu Radu, Paiva-Veretennicoff I. Correlation patterns for an electromagnetic field interacting with a relativistic plasma. In: Bulletin de la Classe des sciences, tome 57, 1971. pp. 457-476
Bulletin de la Classe des sciences, 1973
The correlation pattern formalism is used to derive a kinetic equation for a relativistic plasma ... more The correlation pattern formalism is used to derive a kinetic equation for a relativistic plasma and radiation. Landau and Thomson scattering are taken into account to compute the collision operator for the homogeneous weakly coupled case. An H-theorem is proved. The corresponding linearized kinetic equation is a two dimensional matrix equation, the collision operator of which is hermitian. Its spectrum is shown to be definite negative and its collisional invariants are computed.
Optics and Photonics News, 1994
ABSTRACT
This work is devoted to the study of fluctuations of longitudinal electric field in dissipative n... more This work is devoted to the study of fluctuations of longitudinal electric field in dissipative nonequilibrium plasmas. These multicomponent systems are assumed to be near to a Maxwellian distribution, characterized by different constant temperatures and mean velocities per species. Taking the Langevin approach to the evaluation of kinetic fluctuations, it is shown that the standard generalizations of Callen-Welton's theorem for nonequilibrium systems have to be revised. Explicit values of the intensities of the electrostatic field fluctuations are presented in the high and low frequency regime. These corrections may play an important role in plasma-diagnostics involving scattering of electromagnetic waves.
2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC, 2013
ABSTRACT In the interaction between light and matter, linear momentum can be transferred from ele... more ABSTRACT In the interaction between light and matter, linear momentum can be transferred from electromagnetic waves to particles to generate so-called optical forces. Recently, it has been suggested that optical gradient forces can be used to actuate nanophotonic devices since measurable displacements can be achieved [1]. The typical setup consists of two waveguides positioned in each other's vicinity such that they are coupled through the interaction of the evanescent tails [2]. Although the gradient forces between these waveguides can be enhanced considerably with the use of electromagnetic resonators, the resulting displacements remain relatively small [1,2].
Proceedings of 1994 Nonlinear Optics: Materials, Fundamentals and Applications
ABSTRACT
2003 European Quantum Electronics Conference. EQEC 2003 (IEEE Cat No.03TH8665), 2003
Abstract This work presents a theoretical analysis that can explain the increase in sensitivity o... more Abstract This work presents a theoretical analysis that can explain the increase in sensitivity of a vertical-cavity surface-emitting laser (VCSEL) used as a Doppler velocimeter. The authors use an intensity rate equation model, consisting of two photon density equations (one for each polarisation mode) and one charge carrier equation. Effects of self-and cross-saturation between the modes are included, giving rise to a small region of bistability around the polarisation switching point. The Doppler-shifted optical feedback is introduced in the ...
Le Journal de Physique Colloques, 1979
Physics of Fluids B: Plasma Physics, 1989
SPIE Proceedings, 1989
ABSTRACT
Rarefied Gas Dynamics, 1985
ABSTRACT A model kinetic operator is proposed, describing, at the level of the first Chapman-Ensk... more ABSTRACT A model kinetic operator is proposed, describing, at the level of the first Chapman-Enskog approximation, the relaxational and hydrodynamical behavior of a weakly coupled, n-component plasma, each component being near to a local equilibrium state (n temperatures, n velocities). General expressions are derived for the associated Langevin forces, appearing when long-range fluctuations are present in the system. They display new couplings between the hydrodynamical variables. As a result, new Landau and Lifshitz formulas are obtained; some of them show a non-Markovian behavior, typical for plasmas.
High Speed Phenomena in Photonic Materials and Optical Bistability, 1990
ABSTRACT
Physical Review B, 1993
We present a simple model for the description of the linear and nonlinear optical response of con... more We present a simple model for the description of the linear and nonlinear optical response of conjugated polymers, where the pi electrons are confined in a periodic system composed of anharmonic potential wells. We calculate the optical band gap, the polarizability, and the second hyperpolarizability as a function of the molecular length for the oligomers of thiophene and benzene, adjusting the model parameters to two band-gap measurements. We find them to be in fair agreement with experimental data. Furthermore, the length dependencies are discussed and compared with experimental and theoretical reported values. The model is very suitable for studying the sensitivity of the optical response to conformational disorder.
Optics and Photonics News, 1996
ABSTRACT
Plasma Physics, 1977
ABSTRACT
Optical Computing '88, 1989
ABSTRACT
It is a great but difficult task to give an overview of the research in Quantum Electronics (QE) ... more It is a great but difficult task to give an overview of the research in Quantum Electronics (QE) taking place in Belgium in the present days. There are many reasons for this. First because the field has become so broad that it has ramifications in many of the domains belonging to the other IUPAP commissions and we have to avoid overlaps in the different presentations. Second, because the fundamental research in QE has lead to exciting real life and science fiction type of applications, with tremendous impact on society: it would be worth the while to spend some time on some specific applications, but cannot be done here. Third, because QE has become genuinely multidisciplinary: the topic evolved from fundamental solid state quantum physics to a discipline where physics works at the edge or is truly within material science, electrical engineering , information science and in some cases – within life sciences. And last but not least because, thanks to the continuous support of the Com...
Bulletin de la Classe des sciences, 1971
Balescu Radu, Paiva-Veretennicoff I. Correlation patterns for an electromagnetic field interactin... more Balescu Radu, Paiva-Veretennicoff I. Correlation patterns for an electromagnetic field interacting with a relativistic plasma. In: Bulletin de la Classe des sciences, tome 57, 1971. pp. 457-476
Bulletin de la Classe des sciences, 1973
The correlation pattern formalism is used to derive a kinetic equation for a relativistic plasma ... more The correlation pattern formalism is used to derive a kinetic equation for a relativistic plasma and radiation. Landau and Thomson scattering are taken into account to compute the collision operator for the homogeneous weakly coupled case. An H-theorem is proved. The corresponding linearized kinetic equation is a two dimensional matrix equation, the collision operator of which is hermitian. Its spectrum is shown to be definite negative and its collisional invariants are computed.
Optics and Photonics News, 1994
ABSTRACT
This work is devoted to the study of fluctuations of longitudinal electric field in dissipative n... more This work is devoted to the study of fluctuations of longitudinal electric field in dissipative nonequilibrium plasmas. These multicomponent systems are assumed to be near to a Maxwellian distribution, characterized by different constant temperatures and mean velocities per species. Taking the Langevin approach to the evaluation of kinetic fluctuations, it is shown that the standard generalizations of Callen-Welton's theorem for nonequilibrium systems have to be revised. Explicit values of the intensities of the electrostatic field fluctuations are presented in the high and low frequency regime. These corrections may play an important role in plasma-diagnostics involving scattering of electromagnetic waves.
2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC, 2013
ABSTRACT In the interaction between light and matter, linear momentum can be transferred from ele... more ABSTRACT In the interaction between light and matter, linear momentum can be transferred from electromagnetic waves to particles to generate so-called optical forces. Recently, it has been suggested that optical gradient forces can be used to actuate nanophotonic devices since measurable displacements can be achieved [1]. The typical setup consists of two waveguides positioned in each other's vicinity such that they are coupled through the interaction of the evanescent tails [2]. Although the gradient forces between these waveguides can be enhanced considerably with the use of electromagnetic resonators, the resulting displacements remain relatively small [1,2].
Proceedings of 1994 Nonlinear Optics: Materials, Fundamentals and Applications
ABSTRACT
2003 European Quantum Electronics Conference. EQEC 2003 (IEEE Cat No.03TH8665), 2003
Abstract This work presents a theoretical analysis that can explain the increase in sensitivity o... more Abstract This work presents a theoretical analysis that can explain the increase in sensitivity of a vertical-cavity surface-emitting laser (VCSEL) used as a Doppler velocimeter. The authors use an intensity rate equation model, consisting of two photon density equations (one for each polarisation mode) and one charge carrier equation. Effects of self-and cross-saturation between the modes are included, giving rise to a small region of bistability around the polarisation switching point. The Doppler-shifted optical feedback is introduced in the ...
Le Journal de Physique Colloques, 1979
Physics of Fluids B: Plasma Physics, 1989
SPIE Proceedings, 1989
ABSTRACT
Rarefied Gas Dynamics, 1985
ABSTRACT A model kinetic operator is proposed, describing, at the level of the first Chapman-Ensk... more ABSTRACT A model kinetic operator is proposed, describing, at the level of the first Chapman-Enskog approximation, the relaxational and hydrodynamical behavior of a weakly coupled, n-component plasma, each component being near to a local equilibrium state (n temperatures, n velocities). General expressions are derived for the associated Langevin forces, appearing when long-range fluctuations are present in the system. They display new couplings between the hydrodynamical variables. As a result, new Landau and Lifshitz formulas are obtained; some of them show a non-Markovian behavior, typical for plasmas.
High Speed Phenomena in Photonic Materials and Optical Bistability, 1990
ABSTRACT
Physical Review B, 1993
We present a simple model for the description of the linear and nonlinear optical response of con... more We present a simple model for the description of the linear and nonlinear optical response of conjugated polymers, where the pi electrons are confined in a periodic system composed of anharmonic potential wells. We calculate the optical band gap, the polarizability, and the second hyperpolarizability as a function of the molecular length for the oligomers of thiophene and benzene, adjusting the model parameters to two band-gap measurements. We find them to be in fair agreement with experimental data. Furthermore, the length dependencies are discussed and compared with experimental and theoretical reported values. The model is very suitable for studying the sensitivity of the optical response to conformational disorder.
Optics and Photonics News, 1996
ABSTRACT
Plasma Physics, 1977
ABSTRACT
Optical Computing '88, 1989
ABSTRACT