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Phd Thesis On Metamaterials – 584804
In this thesis computational studies on electromagnetic properties of metamaterials and applications are introduced. The studies include an introduction to the time-domain transmission line modelling (TLM) method and the fundamental scattering properties of metamaterials. The first major objective of the thesis is directed to predicting the resonant frequencies of some forms of cut-wire (CW) metamaterials by using approximate equivalent circuits. The second objective is the improvement of metamaterial simulation efficiency based on two approaches: a simulation method based on retrieved metamaterial electromagnetic properties and one based on digital filtering (DF) techniques. By using the DF techniques, metamaterials are effectively modelled and the simulation times are significantly reduced. The third objective is focused on studying CW metamaterial as potential absorbers by deliberately including conductive losses. The proposed CW metamaterials are found to exhibit customisable absorptance characteristics with arbitrary polarisation. This metamaterial absorber study includes an experimental validation.
This session explores advanced power electronics designs and systems for space applications. Example topics include: power devices; power electronics; electro-magnetic devices; photo-voltaic modules; and power systems. Papers discuss technical aspects of power electronics including extreme thermal and power requirements, efficiency and power management, tolerance to space environments, and reliability.
Members | Choi Research Lab at Yonsei University
Das Family Distinguished Career Development Assistant Professor
PhD, Massachusetts Institute of Technology
Theoretical and numerical investigations on nanophotonics, optoelectronics, plasmonics, metamaterials
Principal Member of Technical Staff, Sandia National Laboratories: David Peters is a Principal Member of Technical Staff at Sandia National Laboratories in the Applied Photonic Microsystems organization. He received his PhD in Electrical Engineering from the Georgia Institute of Technology in 2001. From 2001 to 2004 he was a Director of Central Intelligence Post-Doc at Sandia National Laboratories investigating 2D and 3D photonic crystals. His current interests include the theory, design, and modeling of diffractive optics, plasmonic devices, metamaterials, and metal optics with a focus on infrared detectors and applications.
Homepage – Quantum Optoelectronics Group | ETH …
the Distributed School on Metamaterials) but also other aspects, such as the mutual recognition of the credits earned by students while attending the school events, student exchange programs, and the , a special recognition given to students discussing a PhD thesis on metamaterials.
the Doctoral Programmes on Metamaterials) and dedicated training events for researchers, professionists, and people working in industries and small-medium enterprises.
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Engineering Courses - University of Florida - Acalog …
(2011)Computational studies of the electromagnetic properties of metamaterials and applications. PhD thesis, University of Nottingham.
Acta Acustica united with Acustica: Aims and Scope
The exotic features of the acoustic metamaterials have been exploited for imaging a sub-wavelength object at frequencies into the middle audible – low ultrasonic range, thus beating the so-called diffraction limit. This has been investigated by means of both Finite Element Modelling and a series of experiments. These demonstrate that acoustic metamaterials fabricated using additive manufacturing with a polymer substrate can be used successfully for imaging a subwavelength object within a frequency range that was not previously explored. The experimental setup made use of coded waveform excitation for characterising the performance of these metamaterials in the frequency domain. Such broadband excitations waveforms can be exploited together with advanced signal processing techniques such as Pulse Compression (PuC) to enhance the Signal-to-Noise Ratio (SNR). Hence, a first step toward the realization of an acoustic metamaterial device that can be used with coded waveforms and PuC has been investigated.
The Pythagorean theorem water demo | The Kid …
This session explores innovations and new developments in hardware, network and software aspects of on-board and embedded computing architectures. Example hardware topics include: processors and peripherals; data handling and companion processing ASICs and FPGAs; network connections and network architectures; on-orbit reconfiguration; high speed interconnects; and new standards for embedded space electronics applications. Example software topics include: machine learning techniques; embedded cluster computing; on-board big data analytics; power aware optimal reconfiguration algorithms; Reconfigurable Software Implemented Hardware Fault Tolerance (RSIHFT) algorithms and designs; evolutionary platforms; and autonomous computing designs. Papers address the following topics: processing and network performance; size, weight and power comparisons of different components and architectures; standardized form factors and interfaces utilized; radiation hardness by design, process, or technology; mitigation of other spacecraft environmental factors; software support; and integration and test of elements, as applicable. Descriptions and performance of actual development, test, flight, or mission usage are highly sought.
Electrical Engineering < University of Dayton
This thesis shows both the use of acoustic metamaterials and coded waveforms for Non-Destructive Testing (NDT) applications.The exotic features of the acoustic metamaterials have been exploited for imaging a sub-wavelength object at frequencies into the middle audible – low ultrasonic range, thus beating the so-called diffraction limit. This has been investigated by means of both Finite Element Modelling and a series of experiments. These demonstrate that acoustic metamaterials fabricated using additive manufacturing with a polymer substrate can be used successfully for imaging a subwavelength object within a frequency range that was not previously explored. The experimental setup made use of coded waveform excitation for characterising the performance of these metamaterials in the frequency domain. Such broadband excitations waveforms can be exploited together with advanced signal processing techniques such as Pulse Compression (PuC) to enhance the Signal-to-Noise Ratio (SNR). Hence, a first step toward the realization of an acoustic metamaterial device that can be used with coded waveforms and PuC has been investigated.Parallel research on the optimal use of coded signals with PuC techniques has been carried out. The main characteristics of several widely-used coded waveforms and advanced algorithms have been reported. Their features have been investigated numerically so as to provide a benchmark for choosing an optimal coded waveform and pulse compression algorithm for a given NDT application. In addition, the improvement in inspection capabilities given by these advanced signal processing techniques has been tested using real industrial NDT applications in highly scattering and attenuating samples. This has been done by programming a tailored post-processing/imaging algorithm for each specific application.Furthermore, a portable instrumentation system is described, which is capable of providing a performance comparable to standard bench-top PuC instruments.Finally, an innovative strategy for using coded signals and PuC in active thermography inspection has been investigated. This results in an enhanced defect discrimination in challenging materials with respect to the standard PuC thermography procedure.
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