Tuning Far-field Light-matter Interactions Using Three Dimensional Plasmonic Meta-structures PDF Download
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Author: MD Imran Khan
Publisher:
ISBN:
Category :
Languages : en
Pages : 276
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Book Description
Plasmonic meta-structure paves the way to study and manipulate light both in far and near filed. Achieving invisibility (cloaking) by suppressing scattering from an object using a nanoassembled 3D plasmonic meta-structure is the principal study of this dissertation. The concept of "cloaking" an object is a very attractive one, especially in the visible (VIS) and near infra-red (NIR) regions of the electromagnetic spectrum, as that would reduce the visibility of an object to the eye. One possible route to achieving this goal is by leveraging the plasmonic property of metallic nanoparticles (NPs). In this dissertation a model was developed to simulate light in the VIS and NIR scattered by a core of a homogeneous medium, covered by plasmonic cloak that is a spherical shell composed of gold nanoparticles (AuNPs). To consider realistic, scalable, and robust plasmonic cloaks that are comparable, or larger, in size to the wavelength, a multiscale simulation platform was introduced. This model uses the multiple scattering theory of Foldy and Lax to model interactions of light with AuNPs combined with the method of fundamental solutions to model interactions with the core. Numerical results of the simulations for the scattering cross-sections of core-shell composite indicate significant scattering suppression of up to 50% over a substantial portion of the desired spectral range (400 - 600 nm) for cores as large as 900 nm in diameter by a suitable combination of AuNP sizes and filling fractions of AuNPs in the shell. Suppressing total scattering cross-section by a plasmonic meta-structure effects the angular distribution of the scattered energy both spectrally and spatially. The second project of this dissertation studies the engineering of spatial and spectral profiles applying the plasmonic meta-structures. The possibility of engineering spectral scattering was explored by three-dimensional mesoscale dielectric targets coated with gold nanoparticles (AuNPs) on the surface. By varying AuNP sizes (5-20 nm) and filling fractions of the AuNP coatings (0.1 - 0.3), simulations reveals that under optimal combination of these two parameters, a meta-structure demonstrates reduced or enhanced scattering efficiency compared to the bare core. Furthermore, analysis of the differential scattering cross-section shows that the presence of the AuNP coating alters the angular distribution of scattering by suppressing the angular sidelobes, thereby guiding the scattered power preferentially in the forward direction. The simulated results highlight that with the ability to tune both the spatial and spectral aspects of the scattering profile, these coated structures may serve as a platform for a variety of applications, including passive cloaking and high-resolution imaging. The final part of this dissertation is the experimental realization of nano assembled 3D plasmonic meta-structures following the demonstration of plasmonic cloaking by these structures. These meta-structures were designed based on the simulated results, they are comprised of a dielectric (silica) core coated with randomly distributed AuNPs. Silica surface modified by the suitable amine ligand enabled adsorption of the AuNPs, and electrostatic interactions between AuNPs promoted nanoscale self-assembly, resulted in robust core-shell structures. Furthermore, the meta-structure fabrication process was optimized to achieve the desired surface coverage (> 20%) of AuNPs for varied meta-structure sizes (500 nm, 700 nm). Measured scattering cross-section of bare silica and AuNP coated silica sphere revealed broadband scattering suppression by the plasmonic meta-structures up to 570 nm in the visible spectrum. Simulated and the measured scattering cross-sections of the bare cores and core-shell structures showed a very good agreement confirming the applicability of the multiscale simulation platform to real-world systems
Author: MD Imran Khan
Publisher:
ISBN:
Category :
Languages : en
Pages : 276
Get Book Here
Book Description
Plasmonic meta-structure paves the way to study and manipulate light both in far and near filed. Achieving invisibility (cloaking) by suppressing scattering from an object using a nanoassembled 3D plasmonic meta-structure is the principal study of this dissertation. The concept of "cloaking" an object is a very attractive one, especially in the visible (VIS) and near infra-red (NIR) regions of the electromagnetic spectrum, as that would reduce the visibility of an object to the eye. One possible route to achieving this goal is by leveraging the plasmonic property of metallic nanoparticles (NPs). In this dissertation a model was developed to simulate light in the VIS and NIR scattered by a core of a homogeneous medium, covered by plasmonic cloak that is a spherical shell composed of gold nanoparticles (AuNPs). To consider realistic, scalable, and robust plasmonic cloaks that are comparable, or larger, in size to the wavelength, a multiscale simulation platform was introduced. This model uses the multiple scattering theory of Foldy and Lax to model interactions of light with AuNPs combined with the method of fundamental solutions to model interactions with the core. Numerical results of the simulations for the scattering cross-sections of core-shell composite indicate significant scattering suppression of up to 50% over a substantial portion of the desired spectral range (400 - 600 nm) for cores as large as 900 nm in diameter by a suitable combination of AuNP sizes and filling fractions of AuNPs in the shell. Suppressing total scattering cross-section by a plasmonic meta-structure effects the angular distribution of the scattered energy both spectrally and spatially. The second project of this dissertation studies the engineering of spatial and spectral profiles applying the plasmonic meta-structures. The possibility of engineering spectral scattering was explored by three-dimensional mesoscale dielectric targets coated with gold nanoparticles (AuNPs) on the surface. By varying AuNP sizes (5-20 nm) and filling fractions of the AuNP coatings (0.1 - 0.3), simulations reveals that under optimal combination of these two parameters, a meta-structure demonstrates reduced or enhanced scattering efficiency compared to the bare core. Furthermore, analysis of the differential scattering cross-section shows that the presence of the AuNP coating alters the angular distribution of scattering by suppressing the angular sidelobes, thereby guiding the scattered power preferentially in the forward direction. The simulated results highlight that with the ability to tune both the spatial and spectral aspects of the scattering profile, these coated structures may serve as a platform for a variety of applications, including passive cloaking and high-resolution imaging. The final part of this dissertation is the experimental realization of nano assembled 3D plasmonic meta-structures following the demonstration of plasmonic cloaking by these structures. These meta-structures were designed based on the simulated results, they are comprised of a dielectric (silica) core coated with randomly distributed AuNPs. Silica surface modified by the suitable amine ligand enabled adsorption of the AuNPs, and electrostatic interactions between AuNPs promoted nanoscale self-assembly, resulted in robust core-shell structures. Furthermore, the meta-structure fabrication process was optimized to achieve the desired surface coverage (> 20%) of AuNPs for varied meta-structure sizes (500 nm, 700 nm). Measured scattering cross-section of bare silica and AuNP coated silica sphere revealed broadband scattering suppression by the plasmonic meta-structures up to 570 nm in the visible spectrum. Simulated and the measured scattering cross-sections of the bare cores and core-shell structures showed a very good agreement confirming the applicability of the multiscale simulation platform to real-world systems
Author: Paulo André Dias Gonçalves
Publisher: Springer Nature
ISBN: 3030382915
Category : Science
Languages : en
Pages : 232
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Book Description
This thesis presents a comprehensive theoretical description of classical and quantum aspects of plasmonics in three and two dimensions, and also in transdimensional systems containing elements with different dimensionalities. It focuses on the theoretical understanding of the salient features of plasmons in nanosystems as well as on the multifaceted aspects of plasmon-enhanced light–matter interactions at the nanometer scale. Special emphasis is given to the modeling of nonclassical behavior across the transition regime bridging the classical and the quantum domains. The research presented in this dissertation provides useful tools for understanding surface plasmons in various two- and three-dimensional nanostructures, as well as quantum mechanical effects in their response and their joint impact on light–matter interactions at the extreme nanoscale. These contributions constitute novel and solid advancements in the research field of plasmonics and nanophotonics that will help guide future experimental investigations in the blossoming field of nanophotonics, and also facilitate the design of the next generation of truly nanoscale nanophotonic devices.
Author: Abraham Vázquez-Guardado
Publisher:
ISBN:
Category :
Languages : en
Pages : 136
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Book Description
Light-matter interaction is a pivotal effect that involves the synergetic interplay of electromagnetic fields with fundamental particles. In this regard localized surface plasmons (LSP) arise from coherent interaction of the electromagnetic field with the collective oscillation of free electrons in confined sub-wavelength environments. Their most attractive properties are strong field enhancements at the near field, highly inhomogeneous, peculiar temporal and spatial distributions and unique polarization properties. LSP systems also offer a unique playground for fundamental electromagnetic physics where micro-scale systemic properties can be studied in the macro-scale. These important properties and opportunities are brought up in this work where I study hybrid cavity-coupled plasmonic systems in which the weak plasmonic element is far-field coupled with the photonic cavity by properly tuning its phase. In this work I preset the fundamental understanding of such a complex systems from the multi-resonance interaction picture along experimental demonstration. Using this platform and its intricate near fields I further demonstrate a novel mechanism to generate superchiral light: a field polarization property that adds a degree of freedom to light-matter interactions at the nanoscale exploited in advanced sensing applications and surface effect processes. Finally, the detection of non-chiral analytes, such as proteins, neurotransmitters or nanoparticles, and more complex chiral analytes, such as proteins and its conformation states, amino acids or chiral molecules at low concentrations is demonstrated in several biosensing applications. The accompanied experiential demonstrations were accomplished using the nanoimprinting technique, which places the cavity-coupled hybrid plasmonic system as a unique platform towards realistic applications not limited by expensive lithographic techniques.
Author: Peng Yu
Publisher: Springer Nature
ISBN: 303087544X
Category : Science
Languages : en
Pages : 348
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Book Description
This book highlights cutting-edge research in surface plasmons, discussing the different types and providing a comprehensive overview of their applications. Surface plasmons (SPs) receive special attention in nanoscience and nanotechnology due to their unique optical, electrical, magnetic, and catalytic properties when operating at the nanoscale. The excitation of SPs in metal nanostructures enables the manipulation of light beyond the diffraction limit, which can be utilized for enhancing and tailoring light-matter interactions and developing ultra-compact high-performance nanophotonic devices for various applications. With clear and understandable illustrations, tables, and descriptions, this book provides physicists, materials scientists, chemists, engineers, and their students with a fundamental understanding of surface plasmons and device applications as a basis for future developments.
Author: Mark L. Brongersma
Publisher: Springer
ISBN: 1402043333
Category : Science
Languages : en
Pages : 270
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Book Description
This book discusses a new class of photonic devices, known as surface plasmon nanophotonic structures. The book highlights several exciting new discoveries, while providing a clear discussion of the underlying physics, the nanofabrication issues, and the materials considerations involved in designing plasmonic devices with new functionality. Chapters written by the leaders in the field of plasmonics provide a solid background to each topic.
Author: Mingson Wang (Ph. D.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 346
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Book Description
Advances in nanofabrication and characterization of nanomaterials enable the development of plasmonic nanostructures with unique optical properties. Plasmonic nanostructures have been extensively studied for their potential applications in optical sensing, photothermal therapy, photovoltaics, and photocatalysis. In this dissertation, we present studies of light-matter interactions in hybrid systems consisting of plasmonic nanostructures and functional materials. These studies are focused on four major types of light-matter interactions in plasmonic nanostructures: (1) plasmon-induced resonance energy transfer (PIRET); (2) plasmon-enhanced spontaneous emission; (3) Fano interference between plasmonic nanostructures and emitters; and (4) strong plasmon-exciton coupling. We also achieved the tuning of light-matter interactions by modifying the physical properties of functional materials or plasmonic nanostructures. In addition, the active control of light-matter interactions was demonstrated by integrating plasmonic nanostructures with switchable materials, such as photochromic dyes. Specifically, we first demonstrated the blue-shifted PIRET from a single gold nanorod (AuNR) to dye molecules. AuNRs enable the energy transfer from plasmonic donors to dye acceptors with light having a longer wavelength and lower intensity, compared to dye donors. Secondly, we studied the tuning of plasmon-trion and plasmon-exciton resonance energy transfer from a single gold nanotriangle (AuNT) to monolayer MoS2. We achieved these phenomena by the combination of rationally designed monolayer MoS2-plasmonic nanoparticle hybrid systems and single-nanoparticle measurements. Thirdly, we realized the large modulation of hybrid plasmonic waveguide mode (HPWM) in single hybrid molecule-plasmon nanostructures through the strong molecule-plasmon coupling. The HPWM features both the capacity of plasmonic nanostructures to manipulate light at the nanoscale and the low loss of dielectric waveguides. Fourthly, we demonstrated the photoswitchable plasmon-induced fluorescence enhancement. This large switchable modulation of fluorescence was derived from the large near-field enhancement at the subnanometer gap between Au nanoparticles and switchable intersystem crossing as a nonradiative decay channel in photochromic dyes. Finally, we achieved tunable Fano resonances and plasmon-exciton coupling in two-dimensional (2D) WS2-AuNT hybrid structures at room temperature. The tuning of Fano resonances and plasmon-exciton coupling were achieved by the active control of the WS2 exciton binding energy and dipole-dipole interaction through controlling the dielectric constant of the surrounding medium.
Author: Panayotis G. Kevrekidis
Publisher: Springer Nature
ISBN: 3030449920
Category : Science
Languages : en
Pages : 389
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Book Description
This book explores the impact of nonlinearity on a broad range of areas, including time-honored fields such as biology, geometry, and topology, but also modern ones such as quantum mechanics, networks, metamaterials and artificial intelligence. The concept of nonlinearity is a universal feature in mathematics, physics, chemistry and biology, and is used to characterize systems whose behavior does not amount to a superposition of simple building blocks, but rather features complex and often chaotic patterns and phenomena. Each chapter of the book features a synopsis that not only recaps the recent progress in each field but also charts the challenges that lie ahead. This interdisciplinary book presents contributions from a diverse group of experts from various fields to provide an overview of each field’s past, present and future. It will appeal to both beginners and seasoned researchers in nonlinear science, numerous areas of physics (optics, quantum physics, biophysics), and applied mathematics (ODEs, PDEs, dynamical systems, machine learning) as well as engineering.
Author: G. Shvets
Publisher: World Scientific
ISBN: 9814355283
Category : Science
Languages : en
Pages : 469
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Book Description
Manipulation of plasmonics from nano to micro scale. 1. Introduction. 2. Form-Birefringent metal and its plasmonic anisotropy. 3. Plasmonic photonic crystal. 4. Fourier plasmonics. 5. Nanoscale optical field localization. 6. Conclusions and outlook -- 11. Dielectric-loaded plasmonic waveguide components. 1. Introduction. 2. Design of waveguide dimensions. 3. Sample preparation and near-field characterization. 4. Excitation and propagation of guided modes. 5. Waveguide bends and splitters. 6. Coupling between waveguides. 7. Waveguide-ring resonators. 8. Bragg gratings. 9. Discussion-- 12. Manipulating nanoparticles and enhancing spectroscopy with surface plasmons. 1. Introduction. 2. Propulsion of gold nanoparticles with surface plasmon polaritons. 3. Double resonance substrates for surface-enhanced raman spectroscopy. 4. Conclusions and outlook -- 13. Analysis of light scattering by nanoobjects on a plane surface via discrete sources method. 1. Introduction. 2. Light scattering by a nanorod. 3. Light scattering by a nanoshell. 4. Summary -- 14. Computational techniques for plasmonic antennas and waveguides. 1. Introduction. 2. Time domain solvers. 3. Frequency domain solvers. 4. Plasmonic antennas. 5. Plasmonic waveguides. 6. Advanced structures. 7. Conclusions
Author: Igal Brener
Publisher: Woodhead Publishing
ISBN: 0081024037
Category : Science
Languages : en
Pages : 310
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Book Description
Dielectric Metamaterials: Fundamentals, Designs and Applications links fundamental Mie scattering theory with the latest dielectric metamaterial research, providing a valuable reference for new and experienced researchers in the field. The book begins with a historical, evolving overview of Mie scattering theory. Next, the authors describe how to apply Mie theory to analytically solve the scattering of electromagnetic waves by subwavelength particles. Later chapters focus on Mie resonator-based metamaterials, starting with microwaves where particles are much smaller than the free space wavelengths. In addition, several chapters focus on wave-front engineering using dielectric metasurfaces and the nonlinear optical effects, spontaneous emission manipulation, active devices, and 3D effective media using dielectric metamaterials. Highlights a crucial link in fundamental Mie scattering theory with the latest dielectric metamaterial research spanning materials, design and applications Includes coverage of wave-front engineering and 3D metamaterials Provides computational codes for calculating and simulating Mie resonances
Author: Uwe Kreibig
Publisher: Springer Science & Business Media
ISBN: 3662091097
Category : Technology & Engineering
Languages : en
Pages : 552
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Book Description
Optical Properties of Metal Clusters deals with the electronic structure of metal clusters determined optically. Clusters - as state intermediate between molecules and the extended solid - are important in many areas, e.g. in air pollution, interstellar matter, clay minerals, photography, heterogeneous catalysis, quantum dots, and virus crystals. This book extends the approaches of optical molecular and solid-state methods to clusters, revealing how their optical properties evolve as a function of size. Cluster matter, i.e. extended systems of many clusters - the most frequently occuring form - is also treated. The combination of reviews of experimental techniques, lists of results and detailed descriptions of selected experiments will appeal to experts, newcomers and graduate students in this expanding field.
