Research
On-chip Chemistry Using Micro-droplet Reactors
This research focuses on developing lab-on-a-chip systems for bio-chemical applications. This includes integration of microfluidic droplet generators and micro particle/droplet manipulation system.
Column synthesis
Dielectrophoresis Assisted Enzymatic Reaction
The research focuses on using microelectrodes to dielectrophoretically trap beads/droplets to perform on-chip enzymatic reaction.
On-chip Reaction Detection
Fluorescence microscopy is used to detect and quantify on-chip reactions.
Trapping and Manipulation of Submicron Particles
This research focuses on trapping and controlled manipulation of sub-micron sized particles. The work included modeling, fabrication and testing of chips that employ optical forces and/or dielectrophoretic forces to trap and transport nanoparticles. The goal is to develop lab-on-a-chip systems for biomedical and chemical applications.
Trapping and transport of nanoparticles using a Nano Optical Conveyor Belt
Plasmonic Trapping using C-engravings
C-shaped engravings (CSE) are used to focus light beyond the diffraction limit. The localized intensity enhancement can produce large optical gradient forces that can trap colloidal nanoparticles. Compared to conventional optical tweezers, such plasmonic tweezers can trap particles much smaller in size.
Polarization Sensitive Nano C-Apertures
Plasmonic C-aperture can demonstrate polarization dependent field intensity enhancement. When the incident light is polarized along the arms of the C-aperture, maximum intensity enhancement is achived. And equivalent circuit model can be used to model the phenomenon.
X-ray Imaging
We are researching to developed a compact, sensitive X-ray differential phase contrast (DPC) imaging system that improves field of view, increases fringe visibility and shortens imaging times.
Differential phase contrast imaging.
High-Resolution Differential Phase-Contrast (DPC) X-ray Imaging for Multiphase Flow in three-dimensional Porous Media
This research focuses on a grating-based Differential Phase-Contrast (DPC) X-ray imaging microscopy system for multiphase fluid flow in three-dimensional porous media.
Holographic X-ray detection
We introduce a new method for x-ray detection, holographic x-ray detection, which uses photorefractive materials to create a high resolution and high efficiency detector. The x-ray image is recorded in the volume of the photorefractive material, bypassing the aspect ratio issue of typical x-ray detectors.
Differential Phase-Contrast (DPC) X-ray Imaging for Security Screening
Traditional X-ray imaging systems have based on the absorption of material. Unlike such absorption-based X-ray imaging system, recently, the grating based Talbot-Lau interferometer employing a low brilliance and incoherent X-ray source is widely adopted in medical imaging.
Compressive Sensing of DPC and Material Identification using Machine Learning
DPC CT reconstruction with limited projection views can be achieved using compressive sensing methods. The reconstructed tri-signature CT images can be further used for automatic material identification by machine learning. Our studies indicate that perfect identification can be achieved using DPC tri-signatures, which offer results superior to those provided by absorption signature alone.
Design Optimization for Optical and Electrooptical Devices
This research develops algorithms to optimize the shape of physical devices.
iLabs
iLabs is a platform for interactive display of complex experiments or simulations. It provides an imersive, interactive, and social environment for exploring scientific questions, enabling improved publication of scientific results. This tool facilitates ongoing scientific education for audiences ranging from students through to peer researchers.
