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Articles 1 - 6 of 6
Full-Text Articles in Electronic Devices and Semiconductor Manufacturing
Flux-Quanta Injection For Nonreciprocal Current Control In A Two-Dimensional Noncentrosymmetric Superconducting Structure, Serafim Teknowijoyo, Sara Chahid, Armen Gulian
Flux-Quanta Injection For Nonreciprocal Current Control In A Two-Dimensional Noncentrosymmetric Superconducting Structure, Serafim Teknowijoyo, Sara Chahid, Armen Gulian
Mathematics, Physics, and Computer Science Faculty Articles and Research
We designed and experimentally demonstrated a four-terminal superconducting device, a “quadristor,” that can function as a nonlatching (reversible) superconducting switch from the diode regime to the resistive state by application of a control current much smaller than the main transport current. The device uses a vortex-based superconducting-diode mechanism that is switched back and forth via the injection of flux quanta through auxiliary current leads. Our finding opens a new research area in the field of superconducting electronics.
Monte Carlo Analysis Of Millimeter-Wave Gan Based Gunn Effect Oscillators, Sridhara Viswanadham
Monte Carlo Analysis Of Millimeter-Wave Gan Based Gunn Effect Oscillators, Sridhara Viswanadham
Electrical & Computer Engineering Theses & Dissertations
Gunn diodes are one of the most common high frequency solid-state oscillators at the present time, and are considered as promising devices for millimeter and submillimeter wave applications. Monte Carlo studies of Gunn diodes based on bulk wurtzite GaN have been carried out in this thesis research. Two structures have been examined: (i) devices with conventional single notch structure and (ii) repetitive structures with serial segments to fashion a "multiple domain" device. Wurtzite GaN has been chosen because of the high drift velocity and because analytical expressions for the band structure have recently become available. Performance parameters of interest such …
Theory Of Sic Schottky Barrier Conduction And Model Analysis For Diode Breakdown With And Without Screw Dislocations, Lifeng Zheng
Theory Of Sic Schottky Barrier Conduction And Model Analysis For Diode Breakdown With And Without Screw Dislocations, Lifeng Zheng
Electrical & Computer Engineering Theses & Dissertations
Silicon Carbide is a very promising candidate for applications in high-power, high-temperature, and high-radiation conditions under which conventional semiconductors cannot perform adequately. However, the SiC processing technology has not yet reached maturity. There is also limited knowledge of its physical and chemical characteristics, and its device behavior is not well understood. The aim of this thesis is to analyze two specific problems in the SiC area. The first issue involves the large discrepancy between experimental I - V characteristics of SiC Schottky diodes and their theoretical values. The observed data, especially at low voltages, is found to be orders of …
Wavelength Modulation Spectroscopy With Diode Lasers, Ying Lu
Wavelength Modulation Spectroscopy With Diode Lasers, Ying Lu
Electrical & Computer Engineering Theses & Dissertations
Wavelength Modulation Spectroscopy is a non-intrusive technique which enables several parameters such as concentration, velocity, and temperature of a target specie to be measured. The method involves a modulation of a probe laser beam and detection at the fundamental, or any harmonic frequency, by a phase-sensitive apparatus. The theory of wavelength modulation is discussed. Effects of the finite value of the wavelength modulation index, together with the effects of any residual amplitude modulation that often occurs simultaneously in a diode laser, are included. It is shown that there are several advantages in using detection harmonics orders greater than the second. …
The Effect Of Contacts On The Performance Of Electron-Beam Controlled Gaas And Diamond Switches, Michael Kevin Kennedy
The Effect Of Contacts On The Performance Of Electron-Beam Controlled Gaas And Diamond Switches, Michael Kevin Kennedy
Electrical & Computer Engineering Theses & Dissertations
The performance of GaAs and diamond as electron-beam controlled closing and opening switches has been studied. An emphasis has been placed on the effect of contacts on the current-voltage characteristics. The two materials studied were GaAs and diamond. Using the same semi-insulating GaAs wafer as a source of material, a bulk device and a p-i-n device have been fabricated and compared. The asymmetry of the pin diode allows operation at higher voltage because of the ability to suppress the lock-on effect. Whereas GaAs was ionized through cathodoluminescence; diamond, in the form of thin films, has been directly ionized by the …
Monte Carlo Simulation Of Millimeter-Wave Gunn Effect Oscillators, Ramani Vaidyanathan
Monte Carlo Simulation Of Millimeter-Wave Gunn Effect Oscillators, Ramani Vaidyanathan
Electrical & Computer Engineering Theses & Dissertations
Monte Carlo simulations have been carried out to investigate the performance of microwave Gunn oscillators. Three separate aspects of the simulation problem have been comprehensively addressed in this work. First, the presence of an external circuit has been self-consistently incorporated into the calculations. The inclusion of the external circuit facilitates a study of the circuit controlled regime, and correctly models effects arising from the time dependent boundary conditions. Secondly, microscopic details of the electronic relaxation mechanisms which ultimately control the frequency response limits, have been taken into account through an iterative Monte Carlo-Poisson scheme. This procedure overcomes a potential shortcoming …