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Document Type

Open Access Dissertation

Degree Name

Doctor of Philosophy (PhD)

Degree Program

Electrical and Computer Engineering

Year Degree Awarded

2016

Month Degree Awarded

September

First Advisor

Sigfrid K. Yngvesson

Subject Categories

Electromagnetics and Photonics | Nanotechnology Fabrication

Abstract

Terahertz power generation continues to be a subject of great interest owing mainly to the sparsity and diversity of sources. Though there has been remarkable development in sources, ranging from quantum cascade lasers, time domain spectroscopy systems and multiplier sources, there still exists hurdles when it comes to integration and application. While some sources excel in a particular attribute like power, they are severely limited when it comes to on-chip or system integration, for example. Furthermore, tunable bandwidth and power are inversely related. Electrically driven radiation sources are emergent and this thesis presents work in terahertz generation from arrays of nano-structured graphene, single walled carbon nanotubes and Platinum thin films that are joule-heated and antenna-coupled. As a means of generating terahertz power, this method is simple, while being amenable to monolithic integration with other systems. In single walled carbon nanotube antenna coupled arrays, a measured radiated spectrum that followed the length dependent plasmon resonance model native to one dimensional conductors was demonstrated. Furthermore, the total measured radiated power from graphene and single walled carbon nanotube devices surpassed that predicted by the Nyquist formula while Platinum based arrays fell within the prediction, which is used to describe power from a purely thermal source. Finally, the devices fabricated and measured in this work were very compact and suitable for application in integrated circuits.

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