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Start Over Topic engineered materials, dielectrics and plasmas
3 results

1. High Dynamic Performance Nonlinear Source Emulator

Author

Khiem Nguyen-Duy, Arnold Knott, and Michael A. E. Andersen

Subjects
Engineering, Power, Energy and Industry Applications, energy resources, Testing, Transportation, Nuclear Engineering, 02 engineering and technology, Terrestrial application, Nonlinear circuits, Renewable energy sources, Electric inverters, Research and development, 0202 electrical engineering, electronic engineering, information engineering, Fuel cells, DC-DC converters, Components, Circuits, Devices and Systems, Renewable energy resources, Communication, Networking and Broadcast Technologies, Engineered Materials, Dielectrics and Plasmas, Current voltage characteristics, General Topics for Engineers, DC-DC power converters, Energy source, Fields, Waves and Electromagnetics, Maximum Power Point Tracking algorithms, High dynamic performance, Computing and Processing, Maximum power principle, Settling time, 020209 energy, Nonlinear circuit, Renewable energy source, Short-circuit currents, Capacitance, Generator (circuit theory), Batteries, Current-voltage characteristics, Downstream converters, Electronic engineering, SDG 7 - Affordable and Clean Energy, Electrical and Electronic Engineering, Aerospace, Clean energy sources, Load modeling, Power converters, Buck converter, business.industry, 020208 electrical & electronic engineering, Control engineering, Maximum power point trackers, Converters, Nonlinear system, Signal Processing and Analysis, Integrated circuit modeling, Filter (video), business
Abstract

As research and development of renewable and clean energy based systems is advancing rapidly, the nonlinear source emulator (NSE) is becoming very essential for testing of maximum power point trackers or downstream converters. Renewable and clean energy sources play important roles in both terrestrial and nonterrestrial applications. However, most existing NSEs have only been concerned with simulating energy sources in terrestrial applications, which may not be fast enough for testing of nonterrestrial applications. In this paper, a high-bandwidth NSE is developed that is able to simulate the behaviors of a typical nonlinear source under different critical conditions that can happen during their operations. The proposed 200-W NSE, which consists of a fourth-order output filter buck converter and a novel nonlinear small-signal reference generator, can quickly react not only to an instantaneous change in the input source but also to a load step between nominal and open circuit. Moreover, all of these operation modes have a very fast settling time of only 10 $\mu$ s, which is hundreds of times faster than that of existing works. This attribute allows for higher speed and a more efficient maximum power point tracking algorithm. The proposed NSE, therefore, offers a superior dynamic performance among devices of the same kind.

Published
2016

2. Modeling, fabrication and high power optical characterization of plasmonic waveguides

Author

Oleg Lysenko and Andrei V. Lavrinenko

Subjects
optical characterization, film thickness, Power, Energy and Industry Applications, thin gold films, Optical fiber, metallic thin films, Nanophotonics, Physics::Optics, Optical device fabrication, optical fabrication, optical waveguides, AuSiO2(role ss), law.invention, law, optical losses, Polariton, nanostructured materials, Si(role sur), linear propagation, silicon dioxide, SiO2(role sur), surface plasmon polaritons, Surface plasmon, Components, Circuits, Devices and Systems, O2(role ss), Surface waves, Engineered Materials, Dielectrics and Plasmas, Wavelength, SiO2(role ss), effective index method, nanophotonics, Optoelectronics, silicon compounds, Fields, Waves and Electromagnetics, propagation losses, wavelength 7.5E-07 1.7E-06 m, polaritons, Materials science, Fabrication, Au(role ss), Au(role sur), Bioengineering, plasmonics, Optics, O(role sur), Optical fibers, quality inspection, Si(role ss), high-power laser, Plasmon, AuSiO2(role sur), coupling losses, business.industry, surface plasmons, plasmonic waveguides, gold, wavelength 750 nm to 1700 nm, Surface plasmon polariton, Optical surface waves, propagation vector, Signal Processing and Analysis, Au-SiO2, O(role ss), business, plasmons, O2(role sur)
Abstract

This paper describes modeling, fabrication and high power optical characterization of thin gold films embedded in silicon dioxide. The propagation vector of surface plasmon polaritons has been calculated by the effective index method for the wavelength range of 750-1700 nm and film thickness of 15, 30 and 45 nm. The fabrication process of such plasmonic waveguides with width in the range of 1-100 μm and their quality inspection are described. The results of optical characterization of plasmonic waveguides using a high power laser with the peak power wavelength 1064 nm show significant deviation from the linear propagation regime of surface plasmon polaritons at the average input power of 100 mW and above. Possible reasons for this deviation are heating of the waveguides and subsequent changes in the coupling and propagation losses.

Published
2015

3. High capacity optical links for datacentre connectivity

Author

J. J. Vegas Olmos, Mario A. Usuga, and I. Tafur Monroy

Subjects
Engineering, High data rate, business.industry, Photonics and Electrooptics, Optical communication, short-range communications, High capacity, Components, Circuits, Devices and Systems, optical communications, Multiplexing, Communication, Networking and Broadcast Technologies, Engineered Materials, Dielectrics and Plasmas, Interfacing, connectivity, business, Efficient energy use, Computer network, datacentre
Abstract

There is a timely and growing demand for high capacity optical data transport solutions to provide connectivity inside data centres and between data centres located at different geographical locations. The requirements for reach are in the order of 2 km for intra-datacentre and up to 100 km for inter-datacentre connectivity. Moreover, the requirements for such connectivity solutions include also low cost, high data rate and desirable features such as energy efficiency and reduced interfacing cost. In this paper we review several approaches for intra and inter datacentre that use advanced modulation formats and multiplexing techniques to cope with the requirement of high capacity as well as techniques for reach extension.

Published
2015