The important application for the infrared photodetectors is mainly thermal imaging by focal plane arrays (FPAs) for military and commercial purposes. So far, most mid-wavelength infrared (MWIR) and long-wavelength infrared (LWIR) FPAs are based either on HgCdTe (MCT) or quantum well infrared photodetectors (QWIPs). Even though those technologies are well...
The III-Nitride material system has already proven to be commercially viable for blue light emitting diodes (LEDs), blue laser diodes (LDs), and near UV photodetectors. Continued interest in this field has driven the desire for even lower emission and detection cut-off wavelengths into the solar-blind / deep UV portion of...
All-optical switches have far reaching applications in both quantum and classical information processing. Most current all-optical switches depend on intense interactions between light and nonlinear media which may be extremely inefficient. The need for high switching beam powers have prevented all-optical switching from being very useful in most applications. Our...
As device sizes decrease, more functionality can be placed in an integrated circuit. Therefore, the design complexity of these circuits increases. To deal with complexity, designers move to higher abstraction levels. Currently, the highest abstraction level is the system-level. In our work we investigate the synthesis and verification problem at...
Multi-hop wireless networks hold promise for increasing network capacity, lowering power requirements, and improving coverage over traditional cellular networks. However, their widespread adoption is hampered by challenges that include: 1) unreliable and complex routing protocols due to the transient nature of wireless nodes, 2) difficulties in guaranteeing quality of service...
Video transmission over wireless networks to multiple mobile users has remained a challenging problem due to potential limitations on bandwidth and the time-varying nature of wireless channels. Recent advances in wireless access technologies, such as, HSDPA and IEEE 802.16, are targeted at achieving higher throughput over wireless networks. Meanwhile, advances...
The ability of a machine to synthesize textual output in a form of human language is a long-standing goal in a field of artificial intelligence and has wide-range of applications such as spell correction, speech recognition, machine translation, abstractive summarization, etc. The statistical approach to enable such ability mainly involves...
This thesis reports on the use of optical antennas, and more broadly, metal optics for the engineered collection and enhancement of infrared photodetectors. These ideas would be useful in enhancing at other wavelengths and other types of detectors, but this work is specifically focused on the Quantum Well Infrared Photodetector...
As Power and Energy become the limiting factors for computer designs and systems, a holistic approach for tackling inefficiencies needs to be adopted. Computations need to be classified based on their importance and impact on the end quality, power consumption, and runtime so that the system can perform the needed...
A practical challenge in wireless communication systems is acquisition of channel state information at the transmitter and the receiver. In this thesis, we address the problem of training and limited-rate feedback optimization for fading channels. In a wideband (multi-carrier) channel, given limited coherence time and power, only a finite number...