Дисертації з теми "Nanophotonic method"
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Bilash, О. М., О. М. Galaichenko, O. A. Sushko, and M. M. Rozhitskii. "New nanophotonic detection method of benzo[a]pyrene." Thesis, КНУ імені Тараса Шевченка, 2011. http://openarchive.nure.ua/handle/document/8853.
Повний текст джерелаSushko, O. A., О. М. Bilash, and M. M. Rozhitskii. "Nanophotonic method for polycyclic aromatic hydrocarbons detection in water." Thesis, ISE, 2012. http://openarchive.nure.ua/handle/document/8866.
Повний текст джерелаSushko, O. A., О. М. Bilash, and M. M. Rozhitskii. "Nanophotonic method of organic carcinogens detection in water objects." Thesis, Technische Universität Ilmenau, 2012. http://openarchive.nure.ua/handle/document/8867.
Повний текст джерелаSushko, O. A., О. М. Bilash, and M. M. Rozhitskii. "Nanophotonic method and sensor for polycyclic aromatic hydrocarbons detection." Thesis, ECL 2014, 2014. http://openarchive.nure.ua/handle/document/8963.
Повний текст джерелаSushko, O. A., О. М. Bilash, and M. M. Rozhitskii. "Nanophotonic method for polycyclic aromatic hydrocarbons detection in water solutions." Thesis, Eurosvit, 2013. http://openarchive.nure.ua/handle/document/8870.
Повний текст джерелаArca, Ahmet. "The design and optimisation of nanophotonic devices using the Finite Element Method." Thesis, University of Nottingham, 2010. http://eprints.nottingham.ac.uk/11169/.
Повний текст джерелаBilash, О. М., О. М. Galaichenko, O. A. Sushko, and M. M. Rozhitskii. "Benzo[a]pyrene its influence on human organism and new nanophotonic detection method." Thesis, Benzo[a]pyrene its influence on human organism and new nanophotonic detection method, 2011. http://openarchive.nure.ua/handle/document/8860.
Повний текст джерелаHammond, Alec Michael. "Machine Learning Methods for Nanophotonic Design, Simulation, and Operation." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7131.
Повний текст джерелаKönig, Michael Christian [Verfasser], and K. [Akademischer Betreuer] Busch. "Discontinuous Galerkin Methods in Nanophotonics / Michael Christian König. Betreuer: K. Busch." Karlsruhe : KIT-Bibliothek, 2011. http://d-nb.info/1014279968/34.
Повний текст джерелаFavuzzi, Pedro Antonio. "Ab-initio design methods for selective and efficient optomechanical control of nanophotonic structures." 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/185207.
Повний текст джерелаZhang, Lei Ph D. Massachusetts Institute of Technology Department of Electrical Engineering and Computer Science. "A boundary element method with surface conductive absorbers for 3-D analysis of nanophotonics." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62462.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 127-132).
Fast surface integral equation (SIE) solvers seem to be ideal approaches for simulating 3-D nanophotonic devices, as these devices generate fields both in an interior channel and in the infinite exterior domain. However, many devices of interest, such as optical couplers, have channels that cannot be terminated without generating reflections. Generating absorbers for these channels is a new problem for SIE methods, as the methods were initially developed for problems with finite surfaces. In this thesis, we show that the obvious approach for eliminating reflections, making the channel mildly conductive outside the domain of interest, is inaccurate. We propose a new method in which the absorber has gradually increasing surface conductivity; such an absorber can be easily incorporated in fast integral equation solvers. We present two types of PMCHW-based formulations to incorporate the surface conductivity into the SIE method. The accuracy of the two-type formulations are examined and discussed using an example of the scattering of a Mie sphere with surface conductivities. Moreover, we implement two different FFT-accelerated algorithms for the periodic non-absorbing region and the non-periodic absorbing region. In addition, we use perturbation theory and Poynting's theorem, respectively, to calculate the field decay rate due to the surface conductivity. We show a saturation phenomenon when the electrical surface conductivity is large. However, we show that the saturation is not a problem for the surface absorber since the absorber typically operates in a small surface conductivity regime. We demonstrate the effectiveness of the surface conductive absorber by truncating a rectangular waveguide channel. Numerical results show that this new method is orders of magnitude more effective than a volume absorber. We also show that the transition reflection decreases in a power law with increasing the absorber length. We further apply the surface conductive absorber to terminate a waveguide with period-a sinusoidally corrugated sidewalls. We show that a surface absorber that can perform well when the periodic waveguide system is excited with a large group-velocity mode may fail when excited with a smaller group-velocity mode, and give an asymptotic relation between the surface absorber length, transition reflections and group velocity. Numerical results are given to validate the asymptotic prediction.
by Lei Zhang.
Ph.D.
Huynh, Dan-Nha. "Nonlinear optical phenomena within the discontinuous Galerkin time-domain method." Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/19396.
Повний текст джерелаThis thesis is concerned with the theoretical description of nonlinear optical phenomena with regards to the (numerical) discontinuous Galerkin time-domain (DGTD) method. It deals with two different material models: the hydrodynamic model for metals and the model for Raman-active dielectrics. In the first part, we review the hydrodynamic model for metals, where we apply a perturbative approach to the model. We use this approach to calculate the second-order nonlinear optical effects of second-harmonic generation and sum-frequency generation using the DGTD method. In this context, we will see how to optimize the second-order response of plasmonic nanoantennas by applying a deliberate tuning scheme for the optical excitations as well as by choosing an intelligent nanoantenna design. In the second part, we examine the material model for Raman-active dielectrics. In particular, we see how to derive the third-order nonlinear response by which one can describe the process of stimulated Raman scattering. We show how to incorporate this third-order response into the DGTD scheme yielding a novel set of auxiliary differential equations. Finally, we demonstrate the workings of the modified numerical scheme.
Weiss, Thomas. "Advanced numerical and semi-analytical scattering matrix calculations for modern nano-optics." Thesis, Clermont-Ferrand 2, 2011. http://www.theses.fr/2011CLF22150.
Повний текст джерелаThe optical properties of nanostructures such as photonic crystals and metamaterials have drawn a lot of attention in recent years [1–9]. The numerical derivation of these properties, however, turned out to be quite complicated, especially in the case of metallo-dielectric structures with plasmonic resonances. Hence, advanced numerical methods as well as semi-analytical models are required. In this work, we will show that the scattering matrix formalism can provide both. The scattering matrix approach is a very general concept in physics. In the case of periodic grating structures, the scattering matrix can be derived by the Fourier modal method [10]. For an accurate description of non-trivial planar geometries, we have extended the Fourier modal method by the concept of matched coordinates [11], in which we introduce a new coordinate system that contains the material interfaces as surfaces of constant coordinates. In combination with adaptive spatial resolution [12,13], we can achieve a tremendously improved convergence behavior which allows us to calculate complex metallic shapes efficiently. Using the scattering matrix, it is not only possible to obtain the optical properties for far field incidence, such as transmission, reflection, absorption, and near field distributions, but also to solve the emission from objects inside a structure and to calculate the optical resonances of a system. In this work, we provide an efficient method for the ab initio derivation of three-dimensional optical resonances from the scattering matrix [14]. Knowing the resonances in a single system, it is in addition possible to obtain approximated resonance positions for stacked systems using our method of the resonant mode coupling [15, 16]. The method allows describing both near field and far field regime for stacked two-layer systems, including the strong coupling to Fabry-Perot resonances. Thus, we can study the mutual coupling in such systems efficiently. The work will provide the reader with a basic understanding of the scattering matrix formalism and the Fourier modal method. Furthermore, we will describe in detail our extensions to these methods and show their validity for several examples
Fall, Mandiaye. "Modélisation multi-échelle de systèmes nanophotoniques et plasmoniques." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4777/document.
Повний текст джерелаNanophotonic structures are generally simulated by volume methods, as Finite-difference time-domain (FDTD) method, or Finite element method (FEM). However, for large structures, or metallic plasmonic structures, the memory and time computation required can increase dramatically, and make proper simulation infeasible.Surface methods, like the boundary element method (BEM) have been developed to reduce the number of mesh elements. These methods consist in expressing the electromagnetic filed in whole space as a function of electric and magnetic currents at the surface of scatterers. Combined with the fast multipole method (FMM) that enables a huge acceleration of the calculation of interaction between far mesh elements, very large systems can thus be handled.What we performed is the development of an FMM on a new BEM formalism, based on scalar and vector potentials instead of electric and magnetic currents, for the first time to our knowledge. This method was shown to enable accurate simulation of metallic plasmonic systems, while providing a significant reduction of computation requirements, compared to BEM-alone. Several thousands of unknowns could be handled on a standard computer. More complex nanophotonic systems have been simulated, such as a plasmonic lens consisting of a collection of gold nanorods
Viquerat, Jonathan. "Simulation de la propagation d'ondes électromagnétiques en nano-optique par une méthode Galerkine discontinue d'ordre élevé." Thesis, Nice, 2015. http://www.theses.fr/2015NICE4109/document.
Повний текст джерелаThe goal of this thesis is to develop a discontinuous Galerkin time-domain method to be able to handle realistic nanophotonics computations. During the last decades, the evolution of lithography techniques allowed the creation of geometrical structures at the nanometer scale, thus unveiling a variety of new phenomena arising from light-matter interactions at such levels. These effects usually occur when the device is of comparable size or (much) smaller than the wavelength of the incident field. This work relies on the development and implementation of appropriate models for dispersive materials (mostly metals), as well as on a large panel of classical computational techniques. Two major methodological developments are presented and studied in details: (i) curvilinear elements, and (ii) local order of approximation. This work is complemented with several physical studies of real-life nanophotonics applications
Lebbe, Nicolas. "Contribution à l'optimisation de forme et application à la nanophotonique." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAM047.
Повний текст джерелаThis thesis focuses on the mathematical field of shape optimization and explores two topics:one concerns the systematic determination of the design of nanophotonic components and the other one the optimal shape and location of boundary conditions defining partial differential equations (PDE).• In the mathematical setting of the three-dimensional, time-harmonic Maxwell equations, we proposea shape and topology optimization algorithm combining Hadamard’s boundary variation methodwith a level set representation of shapes and their evolution. A particular attention is devotedto the robustness of the optimized devices with respect to small uncertainties over the physical orgeometrical data of the problem. In this respect, we rely on a simple multi-objective formulation todeal with the two main sources of uncertainties plaguing nanophotonic devices, namely uncertaintiesover the incoming wavelength, and geometric uncertainties entailed by the lithography and etchingfabrication process. Several numerical examples are presented and discussed to assess the efficiencyof our methodology.• The second application concern the optimization of the shape of the regions assigned to different typesof boundary conditions in the definition of a “physical” PDE. This problem proves to be difficult inthe case of a Dirichlet-Neumann transition since it requires a precise study of the singular nature ofPDE solutions at the transition between two regions supporting these boundary conditions. On theone hand a full mathematical study is carried out on this theoretical problem and on the other handa numerical method based on a regularization of the boundary conditions is proposed to optimizethese regions. Various numerical examples are eventually presented in order to appraise the efficiencyof the proposed process
Gobé, Alexis. "Méthodes Galerkin discontinues pour la simulation de problèmes multiéchelles en nanophotonique et applications au piégeage de la lumière dans des cellules solaires." Thesis, Université Côte d'Azur, 2020. http://www.theses.fr/2020COAZ4011.
Повний текст джерелаThe objective of this thesis is the numerical study of light trapping in nanostructured solar cells. Climate change has become a major issue requiring a short-term energy transition. In this context, solar energy seems to be an ideal energy source. This resource is both globally scalable and environmentally friendly. In order to maximize its penetration, it is needed to increase the amount of light absorbed and reduce the costs associated with cell design. Light trapping is a strategy that achieves both of these objectives. The principle is to use nanometric textures to focus the light in the absorbing semiconductor layers. In this work, the Discontinuous Galerkin Time-Domain (DGTD) method is introduced. Two major methodological developments are presented, allowing to better take into account the characteristics of solar cells. First, the use of a local approximation order is proposed, based on a particular order distribution strategy. The second development is the use of hybrid meshes mixing structured hexahedral and unstructured tetrahedral elements. Realistic cases of solar cells from the literature and collaborations with physicists in the field of photovoltaics illustrate the contribution of these developments. A case of inverse optimization of a diffraction grating in a solar cell is also presented by coupling the numerical solver with a Bayesian optimization algorithm. In addition, an in-depth study of the solver's performance has also been carried out with methodological modifications to counter load balancing problems. Finally, a more prospective method, the Multiscale Hybrid-Mixed method (MHM) specialized in solving very highly multiscale problems is introduced. A multiscale time scheme is presented and its stability is proven
Dellinger, Jean. "Imagerie hyperspectrale en champ proche optique : développement et applications à la nanophotonique." Phd thesis, Université de Bourgogne, 2013. http://tel.archives-ouvertes.fr/tel-00908824.
Повний текст джерелаLuo, Haoming. "High frequency thermomechanical study of heterogeneous materials with interfaces." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI130.
Повний текст джерелаHeat transfer is actually intimately related to the sound propagation (acoustic transfer) in materials, as in insulators and semi-conductors the main heat carriers are acoustic phonons. The concept of the presence of interfaces has been largely exploited for efficiently manipulating phonons from long-wavelength to nanometric wavelengths, i.e., frequencies in THz regime, responsible for thermal transport at room temperature. In this thesis, the finite element method is used to perform transient analysis of wavepacket propagation in different mediums. I started with a parametric study of attenuation of acoustic wave-packets in a 2D semi-infinite elastic system with periodic circular interfaces. Three key parameters are investigated, including rigidity contrast, interface density and phonon wavelength. Different energy transfer regimes (propagative, diffusive, and localized) are identified allowing to understand the phonon contribution to thermal transport. Besides the circular interfaces, mechanical response and acoustic attenuation for different types of interfaces are also investigated, such as Eshelby’s inclusion, dendritic shape inclusion and porous materials with ordered/disordered holes. In order to extend the study to amorphous materials, I also considered a heterogeneous medium with random rigidities distributed in space according to a Gaussian distribution based on the theory of heterogeneous shear elasticity of glasses. Finally yet importantly, viscoelastic constitutive laws are proposed to take into account the frequency-dependent intrinsic phonon attenuation in glasses, with the aim of reproducing such intrinsic attenuation using a homogeneous viscous medium. Finite element simulation confirms that a continuum model may strictly follow the atomistic attenuation (G) for a well-calibrated macroscopic linear viscoelastic constitutive law. Compared with the experimental data in a-SiO2, our second constitutive law reproduces qualitatively and quantitatively the three regimes of acoustic attenuation versus frequency : successively Γ∝ω^2,ω^4,ω^2
Lin, Ronghui. "Design and topological optimization of nanophotonic devices." Diss., 2020. http://hdl.handle.net/10754/665997.
Повний текст джерелаJian-ShiungHong and 洪健雄. "Methods for Modeling and Simulation of Perfectly Conducting Subwavelength Structures in Nanophotonics." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/98177848330889861980.
Повний текст джерелаVincent, Serge M. "Full-Vector Finite Difference Mode Solver for Whispering-Gallery Resonators." Thesis, 2015. http://hdl.handle.net/1828/6630.
Повний текст джерелаGraduate