Manipulating Light At Nanoscale
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Manipulating Light At Nanoscale
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Author : Zongfu Yu
language : en
Publisher:
Release Date : 2009
Manipulating Light At Nanoscale written by Zongfu Yu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Nanophotonics
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Author : Hongxing Xu
language : en
Publisher: CRC Press
Release Date : 2017-11-09
Nanophotonics written by Hongxing Xu and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-11-09 with Science categories.
The manipulation of light at the nanometer scale is highly pursued for both fundamental sciences and wide applications. The diffraction limit of light sets the limit for the smallest size of photonic devices to the scale of light wavelength. Fortunately, the peculiar properties of surface plasmons in metal nanostructures make it possible to squeeze light into nanoscale volumes and enable the manipulation of light and light–matter interactions beyond the diffraction limit. Studies on surface plasmons have led to the creation of a booming research field called plasmonics. Because of its various scientific and practical applications, plasmonics attracts researchers from different fields, making it a truly interdisciplinary subject. Nanophotonics: Manipulating Light with Plasmons starts with the general physics of surface plasmons and a brief introduction to the most prominent research topics, followed by a discussion of computational techniques for light scattering by small particles. Then, a few special topics are highlighted, including surfaceenhanced Raman scattering, optical nanoantennas, optical forces, plasmonic waveguides and circuits, and gain-assisted plasmon resonances and propagation. The book discusses the fundamental and representative properties of both localized surface plasmons and propagating surface plasmons. It explains various phenomena and mechanisms using elegant model systems with well-defined structures, is illustrated throughout with excellent figures, and contains an extensive list of references at the end of each chapter. It will help graduate-level students and researchers in nanophotonics, physics, chemistry, materials science, nanoscience and nanotechnology, and electrical and electronic engineering get a quick introduction to this field.
Plasmonic Devices For Manipulating Light At The Nanoscale
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Author : Yin Huang
language : en
Publisher:
Release Date : 2012
Plasmonic Devices For Manipulating Light At The Nanoscale written by Yin Huang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Manipulating Light With Nano Photonic Structures
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Author : Bo Zeng
language : en
Publisher:
Release Date : 2015
Manipulating Light With Nano Photonic Structures written by Bo Zeng and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Manipulation light in the nano scale, by controlling its phase or magnitude, is key to efficient and compact designs in modern photonic technology. Its application ranges from tele-communication, biological imaging to probing electronic phenomena and quantum computation. High Quality factor (Q) resonators for both dielectric and metallic devices with two dimensional form factors, and high on-off ratio wave modulators where light transmission can be tuned in situ are exemplary ideas and of great interest and importance in those applications. Among the light waves, terahertz radiation, known as the last frontier connecting microwave and optical regime in the electromagnetic spectrum, has been an increasingly active field of research. Recent development of THz sources and detection has led to an increasing demand of active devices for its wave manipulation. In the thesis, we focus our effort on developing novel nano photonic structures that act as better light modulator and resonators. We first develop theories regarding principles and techniques to achieve tunable high Q resonances in dielectric photonic structures using a new "diatomic" design. The essence of the "diatomic" design is that it can dramatically improve Q of the resonating modes by minimizing the radiative far-field coupling. We then extend the concept of "diatomic" in dielectric gratings to "diatomic" metallic cavities that results in high Q plasmonic metamaterial resonators compared to conventional designs. Lastly, we demonstrate, in simulation and experiment, a hybrid metamaterial design showing much larger modulation power by combining metallic nano-slits with graphene, a promising THz-active 2D material. Our investigation into THz metamaterial designs combines device fabrication, numerical simulation, semi-analytical modelling and ultra-fast time domain THz measurements. Our theoretical and experimental results could provide insight to the physical understanding and future development of THz metamaterial devices, as well as being of value to the THz community that seeks application with high performance modulator/resonators in general.
Bio Inspired Nanophotonics
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Author : Yang Zhao
language : en
Publisher:
Release Date : 2013
Bio Inspired Nanophotonics written by Yang Zhao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Metals interact very differently with light than with radio waves and finite conductivities and losses often limit the way that RF concepts can be directly transferred to higher frequencies. Plasmonic materials are investigated here for various optical applications, since they can interact, confine and focus light at the nanoscale; however, regular plasmonic devices are severely limited by frequency dispersion and absorption, and confined signals cannot travel along plasmonic lines over few wavelengths. For these reasons, novel concepts and materials should be introduced to successfully manipulate and radiate light in the same flexible way we operate at lower frequencies. In line with these efforts, optical metamaterials exploit the resonant wave interaction of collections of plasmonic nanoparticles to produce anomalous light effects, beyond what naturally available in optical materials and in their basic constituents. Still, these concepts are currently limited by a variety of factors, such as: (a) technological challenges in realizing 3-D bulk composites with specific nano-structured patterns; (b) inherent sensitivity to disorder and losses in their realization; (c) not straightforward modeling of their interaction with nearby optical sources. In this study, we develop a novel paradigm to use single-element nanoantennas, and composite nanoantenna arrays forming two-dimensional metasurfaces and three-dimensional metamaterials, to control and manipulate light and its polarization at the nanoscale, which can possibly bypass the abovementioned limitations in terms of design procedure and experimental realization. The final design of some of the metamaterial concepts proposed in this work was inspired by biological species, whose complex structure can exhibit superior functionalities to detect, control and manipulate the polarization state of light for their orientation, signaling and defense. Inspired by these concepts, we theoretically investigate and design metasurfaces and metamaterial models with the help of fully vectorial numerical simulation tools, and we are able to outline the limitations and ultimate conditions under which the average optical surface impedance concept may accurately describe the complex wave interaction with planar plasmonic metasurfaces. We also experimentally explore various technological approaches compatible with these goals, such as the realization of lithographic single-element nanoantenna and nanoantenna arrays with complex circuit loads, periodic arrays of plasmonic nanoparticles or nanoapertures, and stacks of rotated plasmonic metasurfaces. At the conclusion of this effort, we have theoretically analyzed, designed and experimentally realized and characterized the feasibility of using discrete metasurfaces to realize phenomena and performance that are not available in natural materials, oftentimes inspired by the biological world.
Manipulating Light With Tunable Nanoantennas And Metasurfaces
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Author : Davide Rocco
language : en
Publisher:
Release Date : 2018
Manipulating Light With Tunable Nanoantennas And Metasurfaces written by Davide Rocco and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Electronic books categories.
The extensive progress in nanofabrication techniques enabled innovative methods for molding light at the nanoscale. Subwavelength structured optical elements and, in general, metasurfaces and metamaterials achieved promising results in several research areas, such as holography, microscopy, sensing and nonlinear optics. Still, a demanding challenge is represented by the development of innovative devices with reconfigurable optical properties. Here, we review recent achievements in the field of tunable metasurface. After a brief general introduction about metasurfaces, we will discuss two different mechanisms to implement tunable properties of optical elements at the nanoscale. In particular, we will first focus on phase-transition materials, such as vanadium dioxide, to tune and control the resonances of dipole nanoantennas in the near-infrared region. Finally, we will present a platform based on an AlGaAs metasurface embedded in a liquid crystal matrix that allows the modulation of the generated second harmonic signal.
Manipulation Of Light In Plasmonic Nano Structures
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Author : Rehab Kotb Abd-Allah
language : en
Publisher:
Release Date : 2014
Manipulation Of Light In Plasmonic Nano Structures written by Rehab Kotb Abd-Allah and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Nanotechnology categories.
Abstract: Manipulating light at nano-scale is usually shadowed by the diffraction limit. Recently, plasmonics have emerged as a new technology that enables confining light at nano-scale. Using plasmonic structures, photonic devices can be shrunk from the micro-scale to the nano-scale. In this thesis, a novel structure to a plasmonic nano-filter is introduced and analyzed. The proposed nano-resonator has low loss, compact size and good sensing characteristics. A closed form model to the filter behavior is developed. The model is extracted from the waveguide physical parameters and provides a physical insight into the structure of the filter. An analytical model to the propagation constant and the losses of Metal-Insulator-Metal plasmonic waveguide is proposed. This model is simple, accurate, and shows a good agreement with Finite Difference Time Domain (FDTD) simulations. The model provides a good methodology to obtain high quality filters using cascaded inline filtering. Novel mechanisms for tuning and controlling the response of the plasmonic filter are introduced. These mechanisms allow for full control on the transmission response from these waveguide based structures. This control can be done mechanically, electrically, or optically. Wideband tuning range has been obtained using these schemes. The mechanical tunability is based on changing the filter dimensions using Micro/Nano electro mechanical systems (MEMS/NEMS). The electrical and optical tunability is based on using a nonlinear dielectric material with Pockels or Kerr effect. The tunability is achieved by applying an external voltage or through controlling the input light intensity. The proposed nano-filter supports both red and blue shift in the resonance response. A new approach to control the input light intensity by applying an external voltage to a previous stage is investigated. Tuning the resonance wavelength with high accuracy, minimum insertion loss and high quality factor is obtained using these approaches. The proposed nano-filter can be used in various plasmonic applications such as sensing, biomedical diagnostics and on-chip interconnects. Plasmonic structures can also be used to design nano-optical tweezers. A novel structure for nano optical tweezers using plasmonic triple slit structure is introduced and analyzed. The tweezers have deep potential wells that can trap sub-10-nm dielectric particle stably and efficiently. The resultant 50KT potential well provides tight trapping to the particle. The proposed plasmonic structure allows for steering the particle by simply changing the angle of the incident plane. This simple control allows efficient manipulation to the trapped particle over a wide angle range.
Manipulating Light Matter Interactions With Plasmonic Metamolecules And Metasurfaces
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Author : Nasim Mohammadi Estakhri
language : en
Publisher:
Release Date : 2016
Manipulating Light Matter Interactions With Plasmonic Metamolecules And Metasurfaces written by Nasim Mohammadi Estakhri and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
The interaction of electromagnetic waves with materials is at the basis of several phenomena influencing our everyday lives. Throughout the past few decades we are witnessing a rapid progress in the development of new platforms to engineer and design different aspects of wave-matter interaction for applications ranging from green energy harvesting, to high speed data communication, and medicine. In line with these developments, the advent of metamaterials, or artificially structured materials, introduces an alternative path to mold and control electromagnetic waves with degrees of freedom that are not accessible in natural materials. There is, however, a strong need to broaden the range of applicability of metamaterials thorough strong nanoscale light management, real-time tunability, ease of fabrication, and lowering the losses. In this study we discuss that to what extent it is possible to engineer the scattering, absorption, and local wave-matter interaction of metamolecules, as the basic building-blocks of metamaterials, as well as assembles of them forming complex systems. In this work, first, we propose and investigate new nanoparticle geometries with tailored complex absorption and scattering signatures. We demonstrate that plasmonic-based nanostructures can be tailored to provide unprecedented control of their scattering and absorption/emission response over broad bandwidths, specifically in the optical frequency range. We show that judicious combination of plasmonic-dielectric singular nanoparticles provides very efficient broadband and controllable light absorption and amplification. Based on these composite elements, we propose a nanoscale optical switch with strong sensitivity and tunability. These engineered nanoparticles are also particularly interesting for applications in nonlinear optics, spasing, and energy-harvesting devices. Next, we answer the fundamental question of "to what extent the unwanted scattering from a general absorbing body may be reduced?". We demonstrate the theoretical limitations of a furtive sensor and provide a proof of the concept implementation of minimum-scattering superabsorbers at optical and microwave frequencies. Based on our theoretical analysis, we also explore experimental realization of microwave low-scattering antennas. This study is of particular importance for the near-field subdiffractive probing and closely-packed antenna designs. Last, we propose a new degree of freedom in controlling the propagation and scattering of light through proper arrangements of dissimilar metamolecules over a surface, i.e. gradient metasurfaces. We theoretically investigate and design metasurfaces that are capable of performing complex wave shaping functionalities such as cloaking, yet, over a single ultrathin volume. Our full analytical approach enables us to underline the inherent limitations and wide range of capabilities of metasurfaces, and we propose novel techniques to significantly improve the efficiency of wave manipulation by metasurfaces. We also investigate the proposed concept of local wave manipulation in several practical applications in beam steering, improved energy harvesting, and cloaking arbitrary obstacles, accompanied by experimental realization of negative reflection from optical metasurfaces. Such unprecedented control of optical wave propagation along with compatibility of metasurfaces with standard lithographic techniques and on-chip technology will significantly impact the future application of metasurfaces, paving the way toward flat, compact optical devices.
Photonic Structures For Nanoscale Light Manipulation
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Author : Asaf David
language : en
Publisher:
Release Date : 2016
Photonic Structures For Nanoscale Light Manipulation written by Asaf David and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Manipulating Light Using Nanostructures
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Author : Anil Ghimire
language : en
Publisher:
Release Date : 2014
Manipulating Light Using Nanostructures written by Anil Ghimire and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Atomic force microscopy categories.
