July 18, 2016
Quantum Dot Nanophotonics
Thanks to their 3D-confined nanostructures, quantum dots (QDs) have properties that are far superior to the corresponding materials in bulk form, such as high quantum efficiency, size-dependent tunable emission and high sensitivity. We have demonstrated sub-diffraction limit QD waveguides, nanogap QD photodetectors with high sensitivity and spatial resolution, plasmonic-enhanced QD photodetectors with color selectivity and…
NELT-integrated MEMS for High-accuracy Mass Sensing
In this project, photonic crystal optical tweezers and microfluidic structures are integrated with MEMS resonators. By precisely trapping and positioning the particles on the surface of the MEMS resonators, the mass of the particles can be measured and monitored with high accuracy and repeatability. The technology can be used for living cells and nanoparticles, for…
Nanostructure-Enhanced Laser Tweezers
Optical manipulation of particles has broad applications in nanoscience, biological study and biomedicine. Conventional optical tweezers require high optical intensity due to low efficiency in direct conversion from optical energy to mechanical energy. We explore the enhanced field from plasmonic or photonic crystal nanostructures to increase the trapping efficiency and functionality of optical tweezers. Using…
July 15, 2016
Seattle Living Lab: Smart Urban Parking
Collaborators: Baosen Zhang, Seattle Department of Transportation We are developing new models of urban mobility, specifically parking, informed by a diverse set of real-world data. Using the learned models, we are designing novel low-level control and economic mechanisms to change individual user behavior as well as gain fundamental insights that inform high-level policy and regulation…
Vehicular Network Security
The vehicular ad hoc network (VANET) is an emerging wireless network that allows vehicles to communicate among themselves and with road-side infrastructure. The downside to easy access is that the network can allow eavesdroppers to estimate vehicle locations based on communication signal properties, such as signal strength. Therefore, the successful deployment of VANET infrastructure, such…
Energy-Aware Secure Group Communications in Wireless/Sensor Networks
Our research addressed the problem of securing multicast communications in an energy-constrained ad-hoc network environment. Existing efficient key distribution schemes for wired networks that rely on logical hierarchies are extremely energy inefficient for energy-constrained wireless ad-hoc networks. The joint consideration of routing and physical layer algorithms is critical for developing energy-efficient key distribution schemes. By…
Network Performance Analysis
One of the primary tasks of wireless sensor networks is to monitor a Field of Interest (FoI). The availability of observations is directly related to the number of sensors able to sense a particular event, and can be quantified by computing the fraction of the FoI covered by at least a threshold number of sensors,…
Secure Localization
Wireless sensor networks, which represent a basic tenet of what we call ubiquitous computing, are now or will soon be deployed in physical environments that are vulnerable not only to the vicissitudes of nature but also to acts that could be easily viewed as hostile attacks by potent adversaries. Indeed, unattended operation of sensor-network nodes…
Modeling Vulnerabilities
In order to protect user information and provide robust network operation, a network designer must know what types of attacks to protect against and what threats the network must be robust against. Hence, a necessary prerequisite to robust protocol design is to model network vulnerabilities and the impact of malicious attacks on the network. Protecting…
March 11, 2016
Hybrid Silicon Photonics
To improve the transceivers in current silicon photonics, we are looking into new materials, novel cavities and new modulation techniques. Our approach is to explore a hybrid silicon photonic platform, where the underlying photonic devices are made of silicon, on top of which we will integrate new materials (like electro-optic oxides, 2D materials, polymers and…
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