Acompanha: Ciência e arte na sala de aula e atividades / Este trabalho se propôs a repensar o ensino de alguns tópicos da óptica a partir das relações entre ciência e arte, entendidas como expressões humanas inseparáveis e instrumentos de compreensão do mundo. O referencial teórico possibilitou reflexões sobre o processo ensino-aprendizagem, sobre as relações entre Ciência a Arte como áreas do conhecimento humano construídas sócio historicamente e sobre o papel da criatividade e da imaginação no ensino de ciências. Baseando-se nestas relações, foi desenvolvida uma unidade didática alternativa para transposição de conceitos da óptica geométrica no ensino médio. A intervenção teve como concepção norteadora a pedagogia dialógico-problematizadora de Paulo Freire e se utilizou dos três momentos pedagógicos Estudo da Realidade, Organização do Conhecimento e Aplicação do Conhecimento, que são proposição dos pesquisadores J.A. Angotti e D. Delizoicov. Foi desenvolvida em três etapas e envolveu seis turmas de três colégios estaduais em Curitiba. O tema gerador foi a Arte Urbana (especialmente o grafite), presente no universo dos nossos educandos. A discussão gerada abordou o conceito de Ciência e a problematização foi feita utilizando-se a tela “An Experiment on a Bird in the Air Pump” (1766), de Joseph Wright of Derby. A estratégia de pesquisa foi do tipo observação participante e o tratamento de dados pelo método comparativo constante. Os dados foram obtidos no estilo cooperativo e a categoria geral definida para análise foi a das “Perspectivas tidas pelos sujeitos”, pois esta é consoante com a concepção freiriana de educação centrada nos sujeitos envolvidos e suas vivências. A pesquisa possibilitou concluir que são promissoras as possibilidades de incrementar o ensino de Física numa abordagem que busque reflexão sobre o papel da Ciência na construção coletiva e histórica do conhecimento, enriquecida pelas suas relações com a Arte; tanto na dimensão pedagógica quanto na acadêmica de pesquisa. / A summary of the stages of a qualitative research on Education, developed at UTFPR, Brazil, is presented. The purpose of this work is to rethink Education on some topics of Optics, on the basis of the relationship between Science and Art, which are understood here as inseparable human expressions and representations of the world. Based on this relationship, an alternative didactic unit was developed, aiming the transposition of concepts on Geometrical Optics in high school. The intervention was based on the dialogical and problem-posing approach due to Paulo Freire, and it was applied to six classes at three State high schools in Curitiba. The generative theme was Street Art, ubiquitous in the universe of students. The generated discussion involved the concept of Science and questioning was made using the painting “An Experiment on a Bird in the Air Pump”, by Joseph Wright of Derby (1766). The research strategy was participant observation, and data were processed by constant comparative method. The data were obtained from the cooperative style and the general category set for analysis was that of “Perspectives taken by subject”, since this is consonant with the Freirian conception for education centered on the involved subjects and their experiences. The research made it possible to conclude that the possibilities are promising to increase the teaching of Physics in an approach that aims to reflect on the role of science in building collective and historic knowledge, enriched by their relationships with art; both in pedagogical and academic research.

Acompanha: Ciência e arte na sala de aula e atividades / Este trabalho se propôs a repensar o ensino de alguns tópicos da óptica a partir das relações entre ciência e arte, entendidas como expressões humanas inseparáveis e instrumentos de compreensão do mundo. O referencial teórico possibilitou reflexões sobre o processo ensino-aprendizagem, sobre as relações entre Ciência a Arte como áreas do conhecimento humano construídas sócio historicamente e sobre o papel da criatividade e da imaginação no ensino de ciências. Baseando-se nestas relações, foi desenvolvida uma unidade didática alternativa para transposição de conceitos da óptica geométrica no ensino médio. A intervenção teve como concepção norteadora a pedagogia dialógico-problematizadora de Paulo Freire e se utilizou dos três momentos pedagógicos Estudo da Realidade, Organização do Conhecimento e Aplicação do Conhecimento, que são proposição dos pesquisadores J.A. Angotti e D. Delizoicov. Foi desenvolvida em três etapas e envolveu seis turmas de três colégios estaduais em Curitiba. O tema gerador foi a Arte Urbana (especialmente o grafite), presente no universo dos nossos educandos. A discussão gerada abordou o conceito de Ciência e a problematização foi feita utilizando-se a tela “An Experiment on a Bird in the Air Pump” (1766), de Joseph Wright of Derby. A estratégia de pesquisa foi do tipo observação participante e o tratamento de dados pelo método comparativo constante. Os dados foram obtidos no estilo cooperativo e a categoria geral definida para análise foi a das “Perspectivas tidas pelos sujeitos”, pois esta é consoante com a concepção freiriana de educação centrada nos sujeitos envolvidos e suas vivências. A pesquisa possibilitou concluir que são promissoras as possibilidades de incrementar o ensino de Física numa abordagem que busque reflexão sobre o papel da Ciência na construção coletiva e histórica do conhecimento, enriquecida pelas suas relações com a Arte; tanto na dimensão pedagógica quanto na acadêmica de pesquisa. / A summary of the stages of a qualitative research on Education, developed at UTFPR, Brazil, is presented. The purpose of this work is to rethink Education on some topics of Optics, on the basis of the relationship between Science and Art, which are understood here as inseparable human expressions and representations of the world. Based on this relationship, an alternative didactic unit was developed, aiming the transposition of concepts on Geometrical Optics in high school. The intervention was based on the dialogical and problem-posing approach due to Paulo Freire, and it was applied to six classes at three State high schools in Curitiba. The generative theme was Street Art, ubiquitous in the universe of students. The generated discussion involved the concept of Science and questioning was made using the painting “An Experiment on a Bird in the Air Pump”, by Joseph Wright of Derby (1766). The research strategy was participant observation, and data were processed by constant comparative method. The data were obtained from the cooperative style and the general category set for analysis was that of “Perspectives taken by subject”, since this is consonant with the Freirian conception for education centered on the involved subjects and their experiences. The research made it possible to conclude that the possibilities are promising to increase the teaching of Physics in an approach that aims to reflect on the role of science in building collective and historic knowledge, enriched by their relationships with art; both in pedagogical and academic research.

To investigate near-eld contributions for installed antennas, an in-house code iswritten to incorporate near-eld terms in Shooting and Bouncing Rays (SBR). SBRis a method where rays are launched toward an object and scatter using GeometricalOptics (GO). These rays induce currents on the object, from which the totalscattered eld can be found.To gauge the eect of near-eld terms, the in-house code can be set to excludenear-eld terms. Due to this characteristic, the method is named SBR Includingor Excluding Near-eld Terms (SIENT). The SIENT implementation is thoroughlydescribed. To make SIENT more exible, the code works with triangulated meshesof objects. Antennas are represented as near-eld sources, allowing complex antennasto be represented by simple surface currents. Further, some implementedoptimizations of SIENT are shown.To test the implemented method, SIENT is compared to a reference solution andcomparable commercial SBR solvers. It is shown that SIENT compares well to thecommercial options. Further, it is shown that the inclusion of near-eld terms actsas a small correction to the far-eld of the installed antenna. / För att undersöka närfältsbidrag för installerade antenner, har en kod skrivits för‌att ta med närfältstermer i Shooting Bouncing Rays (SBR). SBR är en metod där strålar (”rays”) skjuts mot ett object och sprids via Geometrisk Optik (GO). Dessa strålar inducerar strömmar på objectet, från vilka det totala sprida fältet kan hittas. För att undersöka bidraget från närfältstermer, så kan koden exkludera dessa. På grund av denna karaktär, kallas koden SBR Including or Excluding Near-field Terms (SIENT). Implementationen av SIENT beskrivs utförligt. För att göra SIENT mer flexibel, arbetar SIENT med triangulerade nät av objekt. Antenner representeras av närfältskällor, vilket låter komplexa antenner representeras med enkla yt-strömmar.Implementerade optimeringar av SIENT visas också.För att testa den implementerade metoden, jämförs SIENT med en referenslösning och jämförbara kommerciella SBR-lösare. Det visas att SIENT överensstämmer bra med kommerciella alternativ. Det visas också att närfältstermer agerar som enmindre korrektion till fjärrfältet av den installerade antennen.

Il existe au niveau d’interfaces séparant des milieux de constantes diélectriques de signes opposés des ondes électromagnétiques confinées à proximité de ces interfaces. On parle d’ondes de surface. C’est notamment le cas des métaux et des cristaux polaires : on parle alors de plasmons-polaritons de surface et de phonons-polaritons de surface respectivement. L’objectif de cette thèse est de revisiter certains aspects théoriques associés à ces ondes de surface.Dans un premier temps, en nous basant sur le formalisme de Green, nous donnons un moyen d’obtenir une expression du champ des ondes de surface sous forme de somme de modes. En présence de pertes, ces ondes ont nécessairement un vecteur d’onde ou une pulsation complexe. Nous donnons ainsi deux expressions de leur champ, correspondant à chacun de ces deux cas, et discutons de l’opportunité d’utiliser l’une ou l’autre de ces expressions.Nous posons par la suite les bases d’une optique de Fourier et d’une optique géométrique des ondes de surface. Nous montrons comment obtenir une équation de Helmholtz à deux dimensions pour les ondes de surface, un principe d’Huygens-Fresnel pour les ondes de surface, ainsi qu’une équation eikonale pour les ondes de surface, qui s’applique sous certaines hypothèses. Nous nous intéressons également à la superlentille proposée par Pendry, qui s’appuie sur les ondes de surface. Nous étudions notamment le fonctionnement de cette superlentille en régime impulsionnel, et montrons qu’en présence de pertes, il est possible d’obtenir une meilleure résolution avec certaines formes d’impulsion par rapport au régime harmonique, au prix d’une importante baisse de signal toutefois.Nous développons ensuite un traitement quantique des ondes de surface. Nous calculons au préalable une expression de leur énergie, et nous donnons une expression de leur hamiltonien et de leurs opérateurs champ. Sans pertes, nous montrons que le facteur de Purcell prédit par notre théorie quantique est rigoureusement égal au facteur de Purcell calculé avec des outils classiques. Nous comparons ensuite ce facteur de Purcell à celui calculé classiquement avec pertes, et montrons sur un exemple que les pertes peuvent être négligées dans de nombreux cas. Nous donnons enfin une expression des coefficients d’Einstein associés aux ondes de surface permettant d’étudier la dynamique de l’inversion de population d’un milieu fournissant un gain aux ondes de surface. Nous appliquons par la suite ce formalisme quantique à l’interaction électrons-phonons-polaritons de surface dans les puits quantiques, notamment leur interaction avec un mode de phonon du puits particulièrement confiné grâce à un effet de constante diélectrique proche de zéro (epsilon near zero, ENZ). / Interfaces between materials having opposite dielectric constants support electromagnetic waves confined close to these interfaces called surface waves. For metals and polar crystals, they are respectively called surface plasmon-polaritons and surface phonon-polaritons. The goal of this thesis is to revisit some theoretical aspects associated to these surface waves.Using the Green formalism, we derive an expression of the surface wave field as a sum of modes. With losses, these waves must have a complex wave vector or frequency. Thus we give two expressions of their field, for each of these cases, and discuss when each of these expressions should be used.We then give the basis of a surface wave Fourier optics and geometrical optics. We derive a 2D Helmholtz equation for surface waves, a Huygens-Fresnel principle for surface waves, and an eikonal equation for surface waves. We then take a look at Pendry’s superlens, in which surface waves play a major role. We study the behavior of the superlens in pulsed mode taking losses into account, and show that its resolution can be increased for some pulse shapes compared to the steady state, at the expense of a signal decay.We then develop a quantum treatment of surface waves. We first calculate their energy, and then give an expression of their hamiltonian and field operators. Without losses, we show that the Purcell factor given by our quantum theory is perfectly equal to the Purcell factor given by the classical theory. We then compare this Purcell factor to the lossy case on an example, and show that losses can often be neglected. We then derive the Einstein coefficients associated to surface wave emission and absorption, which allow studying the population inversion dynamics of a gain medium. We then use this quantum formalism to study the interaction between electrons and surface phonon-polaritons in quantum wells, particularly their interaction with a phonon mode which features high confinement thanks to an epsilon near zero (ENZ) effect.

Acompanha: Óptica, Joseph Wright e Edmodo / Esta dissertação investigou a compreensão dos conceitos introdutórios de Óptica mediados por uma plataforma de mídia social – Edmodo – utilizando a observação de telas do pintor inglês Joseph Wright (1734 – 1797). No século XVIII, na Inglaterra, marcado pela Revolução Industrial e o Iluminismo, as ciências físicas, químicas e biológicas tiveram um grande desenvolvimento. E é neste contexto que Joseph Wright produz uma série de pinturas de cenas noturnas representando questões científicas e industriais. Algumas de suas obras foram utilizadas para introduzir a Óptica em turmas de 2°ano do ensino médio de duas escolas estaduais do Paraná. O Ensino de Física atualmente demanda o uso de TIC e o Edmodo, que é uma plataforma de mídia social educativa, foi escolhida para mediar Arte e Física. Três atividades foram propostas: descrição de telas de Joseph Wright, questionário sobre o contexto histórico e fotografias contextualizadas. A abordagem da pesquisa foi qualitativa com procedimentos metodológicos segundo a pesquisa-ação. A coleta de dados consistiu na observação sistemática de atividades realizadas, da participação na plataforma e das interações provocadas com esta prática e, também na observação participante na apresentação das fotografias pelos estudantes. Concluiu-se que o conjunto Arte, História e Óptica consegue potencializar o ensino de conceitos de Óptica. Considerando a complexidade dos elementos envolvidos na pesquisa - as telas de Joseph Wright e o Edmodo - a postura dialógica nas práticas mostrou que os grupos de estudantes são potencialmente colaborativos quando estes elementos novos são introduzidos junto com os conteúdos da disciplina. Contudo, um tempo maior para esta ambientação com a TIC escolhida é necessário, visando estimular e ampliar a aprendizagem colaborativa. / This thesis investigated the understanding of introductory concepts of Optics mediated by a social media platform - Edmodo - and using the viewing screen of the english painter Joseph Wright (1734-1797). In the XVIII century in England, marked by the Industrial Revolution and the Enlightenment, the physical, chemical and biological sciences had a great development. It is in this context that Joseph Wright produces a number of night scenes paintings representing scientific and industrial issues. Some of his works were used to enter the Optics in classes of 2nd year of high school to two state schools of Paraná. The teaching of Physics currently requires the use of ICT and Edmodo, which is an educational social media platform, was chosen to mediate Art and Physics. Three activities are proposed: description of Joseph Wright screens, questionnaire on the historical context and contextual photographs. The research approach was qualitative and methodological procedures according to action research. Data collection consisted of systematic observation of activities performed, participation in the platform and interactions caused by this practice and also on participant observation in the presentation of photographs by students. It was concluded that all Art, History and Optics, can enhance the teaching optics concepts. Considering the complexity of the elements involved in the research - Joseph Wright’s screens and Edmodo - dialogical approach in practice has shown that student groups are potentially collaborative when these new elements are introduced along with the contents of the subject. However, a longer time for this setting with the chosen ICT is necessary to stimulate and expand the collaborative learning.

Acompanha: Óptica, Joseph Wright e Edmodo / Esta dissertação investigou a compreensão dos conceitos introdutórios de Óptica mediados por uma plataforma de mídia social – Edmodo – utilizando a observação de telas do pintor inglês Joseph Wright (1734 – 1797). No século XVIII, na Inglaterra, marcado pela Revolução Industrial e o Iluminismo, as ciências físicas, químicas e biológicas tiveram um grande desenvolvimento. E é neste contexto que Joseph Wright produz uma série de pinturas de cenas noturnas representando questões científicas e industriais. Algumas de suas obras foram utilizadas para introduzir a Óptica em turmas de 2°ano do ensino médio de duas escolas estaduais do Paraná. O Ensino de Física atualmente demanda o uso de TIC e o Edmodo, que é uma plataforma de mídia social educativa, foi escolhida para mediar Arte e Física. Três atividades foram propostas: descrição de telas de Joseph Wright, questionário sobre o contexto histórico e fotografias contextualizadas. A abordagem da pesquisa foi qualitativa com procedimentos metodológicos segundo a pesquisa-ação. A coleta de dados consistiu na observação sistemática de atividades realizadas, da participação na plataforma e das interações provocadas com esta prática e, também na observação participante na apresentação das fotografias pelos estudantes. Concluiu-se que o conjunto Arte, História e Óptica consegue potencializar o ensino de conceitos de Óptica. Considerando a complexidade dos elementos envolvidos na pesquisa - as telas de Joseph Wright e o Edmodo - a postura dialógica nas práticas mostrou que os grupos de estudantes são potencialmente colaborativos quando estes elementos novos são introduzidos junto com os conteúdos da disciplina. Contudo, um tempo maior para esta ambientação com a TIC escolhida é necessário, visando estimular e ampliar a aprendizagem colaborativa. / This thesis investigated the understanding of introductory concepts of Optics mediated by a social media platform - Edmodo - and using the viewing screen of the english painter Joseph Wright (1734-1797). In the XVIII century in England, marked by the Industrial Revolution and the Enlightenment, the physical, chemical and biological sciences had a great development. It is in this context that Joseph Wright produces a number of night scenes paintings representing scientific and industrial issues. Some of his works were used to enter the Optics in classes of 2nd year of high school to two state schools of Paraná. The teaching of Physics currently requires the use of ICT and Edmodo, which is an educational social media platform, was chosen to mediate Art and Physics. Three activities are proposed: description of Joseph Wright screens, questionnaire on the historical context and contextual photographs. The research approach was qualitative and methodological procedures according to action research. Data collection consisted of systematic observation of activities performed, participation in the platform and interactions caused by this practice and also on participant observation in the presentation of photographs by students. It was concluded that all Art, History and Optics, can enhance the teaching optics concepts. Considering the complexity of the elements involved in the research - Joseph Wright’s screens and Edmodo - dialogical approach in practice has shown that student groups are potentially collaborative when these new elements are introduced along with the contents of the subject. However, a longer time for this setting with the chosen ICT is necessary to stimulate and expand the collaborative learning.

Le travail réalisé dans le cadre de cette thèse s’intègre bien dans le domaine de la télédétection de l’environnement maritime. Il porte notamment, d’une part sur l’étude de l’interaction d’une onde électromagnétique avec une surface maritime en présence d’une cible complexe et observée en configuration bi-statique. D’autre part l’étude est complétée par l’étude et l’analyse de l’influence des différents paramètres à la fois liés à la cible et aussi à l’environnement. Dans ce contexte d’étude, le présent travail s’articule autour de deux volets importants. Le premier vise l’étude et la simulation de la Surface Equivalente Radar(SER) d’une cible complexe placée dans son environnement maritime. Et un deuxième volet applicatif traite l’imagerie radar ISAR d’une scène observée, avec prise en compte des cibles présentes sur la surface. Afin de traiter le premier point, le modèle électromagnétique retenu est basé sur une combinaison de méthodes asymptotiques (Optique Physique (OP), Optique Géométrique (OG), Méthode des courants équivalents (MCE)). Pour l’étude de l’influence de la surface de mer sur la réponse électromagnétique de la cible, nous avons opté pour une représentation de la scène (cible+surface de mer) par un ensemble de facettes triangulaires. Dans ce cadre, la cible discrétisée par un maillage triangulaire est générée à l’aide d’un outil de CAO (CATIA V5), quant à la surface de la mer, elle est générée en utilisant le spectre de mer d’Elfouhaily (et le modèle de Debye pour la prise en compte des paramètres diélectriques de l’eau de mer). Enfin, pour l’application de l’imagerie radar ISAR, le calcul de la SER de la cible navale a été effectué en considérant une nouvelle représentation de la cible en parallélépipèdes. La méthodologie proposée a été évalué via des simulations ainsi que des expérimentations sur un modèle générique d’un navire. / The work presented here interset with remote sensing of the maritime environment.It espacially carried with the study of electromagnetic scattering by sea surface with the presence of the target. This study is done in bistatic configuration. So, it is completed by the analysis of the influence of various parameters related to the target and also to the environment. In this context, this work focuses on two important parts. The first is the study and simulation of Radar Cross Section (RCS) of a complex target placed in the maritime environment.And the second part deals with the application of ISAR radar imagery of an observed scene, with consideration of target on the sea surface. We have opted for a combination between Physical Optics (PO), Geometrical Optics (GO) and Equivalent Edge Currents (ECM) (POGO/ EMC) to estimate the RCS. In order to take into account the infuence of sea surface, we have genereted a 2D sea surface from the Elfouhaily spectrum. In order to integrate the target into the scenario (the target in its environment, radar imagery), we propose a parallelepiped representation of the naval taget and RCS calculation. The proposed methodology was evaluated through simulations and measurements on a generic model of a ship.