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Full-Text Articles in Engineering
Computational Method To Calculate Output Current For Gated Spad To Determine Dcr And Pde, Ahmad Salih Azzahrani
Computational Method To Calculate Output Current For Gated Spad To Determine Dcr And Pde, Ahmad Salih Azzahrani
Theses and Dissertations
The problem of detecting a single-photon is receiving considerable attention with the development of new single-photon detectors in stressed free-space optical communication, low probability of intercept (LPI) optical communication, quantum communication, and remote sensing. The theoretical modeling of the waveforms of the single-photon detector output produced in particular systems will expedite the search for and analysis of detected signals. A mathematical model of the output current of a single-photon avalanche detector (SPAD) gated with sinusoidal and Gaussian signals is developed and discussed. The mathematical model is combined with existing circuit and physical models to produce a compact model of the …
Graphene Surface Plasmon Applications In Designing Novel Nano-Heterostructure Arrays, Seyededriss Mirniaharikandi
Graphene Surface Plasmon Applications In Designing Novel Nano-Heterostructure Arrays, Seyededriss Mirniaharikandi
Theses and Dissertations
Graphene is the flat monolayer of carbon atoms constructing a two-dimensional honeycomb lattice with an exotic mechanic, electronic, magnetic, and optical properties. Interestingly, the graphene has been experimentally shown its unique properties in photonics, where the first commercial application of graphene has been realized. Graphene possesses intrinsic plasmons that are electronically tunable, adjustable, and have low dissipation. Recently, the combination of graphene with noble metals and semiconductors structures promises a variety of exciting applications for conventional plasmonics and photonics. In this thesis, we present how to efficiently design heterostructure by combining graphene plasmonic metasurface with noble metals and semiconductors. First, …
A Novel Design Of Broadband Antennas With A Defected Radiating Patch Structure For Wireless Communication Systems, Ali Giuma F Esseid
A Novel Design Of Broadband Antennas With A Defected Radiating Patch Structure For Wireless Communication Systems, Ali Giuma F Esseid
Theses and Dissertations
Generally, conventional wireless communication systems transfer data between two points through a channel, consisting of broadband with a multi-frequency band. Broadband or multiband is very important in wireless telecommunication devices. It is quickly advancing as high-speed and high-level data rate wireless modern communication technology. In wireless modern communication the antenna plays a very crucial role. Broadband with a multi-frequency band purpose has been the incitement of this research. However, there are a lot of challenges in designing and accomplishing a broadband with a multi-frequency band antenna than with a tight impedance bandwidth single antenna. Appropriate broadband with multi-frequency band antenna …
Analysis And Computation Of Polaritonic Systems In Infrared Regime For Sensing Applications, Abdelgader Ahmed Alshiekh Alsalhin
Analysis And Computation Of Polaritonic Systems In Infrared Regime For Sensing Applications, Abdelgader Ahmed Alshiekh Alsalhin
Theses and Dissertations
Generally, the aims of this work tend to focus on introducing novel designs for IR-sensing and a solid related knowledge based on computational analysis and investigations for polaritonic systems. This modern field of nanophotonics has been interested and promising nowadays thanks to the development in nano-fabrications and computing power and speed. Therefore, the theme-work is organized into two main parts along with the goals were addressed initially. The first part provides the necessary concepts for different responses of materials exposed to electromagnetic (EM) intensity which usually known as EM-matter interaction. Also, this part highlights how engineering these interactions in nano-scale …
Infrared Detection And Waveguiding Using Metasurfaces, Navaneeth Premkumar
Infrared Detection And Waveguiding Using Metasurfaces, Navaneeth Premkumar
Theses and Dissertations
The goal of this work is to be able to detect thermal radiation in the long-wave and mid-infrared spectrum to a reasonable efficiency. In order to aid this effort, antenna arrays with large collection apertures are coupled with infrared bolometers. This dissertation shows the performance of a series-fed patch type of leaky-wave antenna array coupled to a Nickel bolometer in terms of the angular-frequency scanning abilities of the antenna. The antenna is then made out of electrooptic Graphene in order to be able to dynamically tune the radiation properties of the antenna. A two-dimensional leaky-wave antenna array made from Gold …
Voltage Controlled Laser Scribed Graphene (Lsg) Microstrip Attenuator, Nathaniel Michael D’Agati
Voltage Controlled Laser Scribed Graphene (Lsg) Microstrip Attenuator, Nathaniel Michael D’Agati
Theses and Dissertations
In this paper, a preliminary design of a voltage-tunable microstrip attenuator using Laser Scribed graphene (LSG) is proposed. The paper will demonstrate that the fabrication of LSG from graphene oxide on standard doubled-sided FR-4 Copper-clad Substrate can be used as a voltage-controlled resistor that results in a tunable microstrip attenuator across the microwave frequencies from 50MHz to 5.5GHz. The measured attenuation ranges from 2.6 dB to 11.5dB at 4 GHz with a DC bias voltage ranging from 0V (minimum attenuation) to 6.0V (maximum attenuation). Graphene is a unique material with interesting electromagnetic and mechanical properties. Graphene conducts electricity better than …
Microgravity Emergency Medical Containment System – A Concept Of Architecture, Prototyping, And Usability Research, Keith Elliott Crisman
Microgravity Emergency Medical Containment System – A Concept Of Architecture, Prototyping, And Usability Research, Keith Elliott Crisman
Theses and Dissertations
Exploration is intrinsic to human nature but is well understood to be accompanied by inherent risks to the explorer. This is particularly evident in the exploration of extreme environments such as long-duration space habitation; in which risk is increased due in particular to the distance from assistance, services, and replenishment of consumables. One of the major risks to extreme environment survivability is lack of access to emergency medical care. This risk is further amplified in the microgravity environment where terrestrial non-life-threatening conditions can become life threatening due to lack of next-level-care capabilities. The question posed within this research asks, ‘What …
Optical Nanoantenna Coupled Detector And Hybrid Surface Waveguide, Shenjie Miao
Optical Nanoantenna Coupled Detector And Hybrid Surface Waveguide, Shenjie Miao
Theses and Dissertations
In recent years, plasmonic resonant antennas have seen widespread consideration in many detection and chemistry applications due to their potential for enhancing and confining the emission and polarization of electromagnetic fields. Examples include optical couplers to ultra-compact photodetectors, high-resolution optical microscopy, enablers of single molecule Raman signal detection and heating elements that facilitate nanostructure growth. A wideband teardrop shape antenna coupled detector will illustrate in this dissertation. An asymmetric cross-bowtie antenna is investigated for providing a broad circular polarized frequency response in the long wave infrared (LWIR). The asymmetric cross-bowtie antenna is constructed with two perpendicular bowtie antennas with differing …