Non-contact optical probing and manipulation of nano/micro objects by laser irradiation presents many significant advantages over conventional micro-manipulation techniques. This project envelops novel optical trapping probes for optical imaging, sensing and manipulation, particularly in the near-field region.
We're aim to achieve technological advances in the following areas:
- engineering of optical momentum and angular momentum, including the development of FDTD simulation model for near-field scattering and trapping
- optical nanometry system for measuring ultra-weak force and torque
- optical trapping with ultrashort pulsed lasers and morphology dependent resonance
- dynamic control of focal spots for near-field imaging, sensing and manipulation
- development of plasmonic trapping techniques for nanoparticle trapping and manipulation
- development of near-field super-resolution techniques
- develop surface plasma enhanced evanescent fields for optical manipulation and sensing
- laser trapping applications in micro-fluidic systems.
Figure: Optical stress (force per unit area) on a biconcave red blood cell under nearfield optical tweezers.
Project leader: Associate Professor Xiaosong Gan