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Research Areas

Implantable Electrode, for collecting brain neural signals. Karen Cheung.

Circuits of the Future? Crossed single-walled carbon nanotubes. Dr. Alireza Nojeh.

Micromotors and Sensors: Mechanical parts are etched in silicon. Dr. Edmond Cretu.

Research in our group is in areas:

Research projects:

When electrons are confined in one or more dimensions, their wave nature and quantum mechanical effects become very apparent. Devices such as quantum wires and quantum dots operate based on this principle. We work on fabricating such devices by exploiting the inherent properties of nanotubes and nanowires.
We develop methods for thermal modulation of the widths of microchannels during operation of microfluidic devices. This allows arbitrary modulation of the channel width after device fabrication so that flow rate and flow velocity can be set independently.
We are developing technology for microflow control that is suitable for portable low-cost instruments. Building blocks are fully integratable devices including microvalves, micropumps and micromixers. Concerns are low power consumption, fast response time and low cost.
Reversible cell trapping in microfluidic channels using hydrogels
Our research group is developing a variety of sensing devices fabricated using inkjet printing. We are exploring physical and chemical sensing technology for applications in air quality monitoring, structural health monitoring, breath analysis, and other important applications.
Electrokinetic methods for isolation, concentration, and purification of pathogenic bacteria from complex media. Fabrication of integrated microfluidics for front-end purification followed by genetic and immunological characterization.
DEP setup
Gyroscopes are used to sense angular rate and when used along with accelerometers can be used as effective navigation sensors. Due to their tiny size(1cmx1cm)die and high sensitivity they could be used in minimally invasive surgery.
Modal Analysis
Application of printing methods in producing organic transistors has promised low-cost electronics, but a printed transistor has a poor performance due to the thick semiconductor layer. Also, most of organic transistors operate at high voltages (> 40V). We are investigating two types of organic transistors, OMESFET and dual gate transistor, to overcome the voltage problem and enhance the performance in a thick film transistor.
We develop methods to enhance current microfabrication technologies. Focus of this work is on material functionality and user friendliness.
Advanced Fabrication
We are developing FPGA-base high-speed control for arrays of electrostatically driven micromirrors.
Mirco-ring lasers (MRLs) are compact semiconductor lasers, where the output light is coupled directly into a planar waveguide, making them suitable for monolithic integration with other optical components, and promising for optical communications and optical interconnects. We are integrating a heterojunction bipolar transistor (HBT) structure into the MRL, and designing for very high frequency modulation modulation (>40 GHz).
This project aims to develop a multimodality optical imaging system by integrating multiphoton microscopy (MPM) with optical coherence tomography (OCT). MPM is sensitive to cells and extracellular matrix, and OCT to structural interfaces and tissue layers. The system will acquire structural and functional imaging of tissues simultaneously.
The objective of this project is to build an adaptive micro-optical systems using a 2D micromirror array adaptively controlled through digital signal processing algorithms implemented in reconfigurable hardware (FPGA)
The objective of this project is to design and construct a confocal imaging engine using MOEMS technology and to couple this with Raman Spectroscopy system in order to form a handheld device with dual complementary capabilities: cellular-level resolved confocal skin imaging combined with accurate and precise Raman spectroscopy of specific subsurface skin microstructures in vivo.
Protein adsorption at the biomaterial-tissue interface is the first and critical event that initializes a cascade of host responses, including platelet activation, blood coagulation, and complement activation.1 Many approaches have been used to prevent such non-specific biological interactions.This research is investigating an engineering surface that uses micromechanical vibration to minimize protein adsorption.
CMUT arrays promise a new generation of ultrasound imaging systems, with applications in 3D and 4D (real-time 3D) non-invasive imaging or high-frequency imaging (ultrasound biomicroscopy). The project targets the development of a portable CMUT-based ultrasound imaging system, to be used for breast cancer detection and monitoring.
High-resolution imaging, in particular using electron microscopes, is an integral part of device research. For nanoscale structures, artefacts such as those arising from sample charging and contamination deposition can severely affect the imaging process.
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We use techniques ranging from classical, continuum modeling, to molecular dynamics, to quantum mechanical simulations using the density functional theory and first-principles techniques such as the Hartree-Fock method. We investigate the mechanical properties, electronic structure, transport characteristics and optical properties of nanodevices.
It is well known that carbon nanotubes and arrays of metal nanowires are ultra-strong. What is less well known is that voltage can be applied to make these materials contract and expand, creating impressive muscle like actuation. We are studying this new method of actuation and its initial applications.