Centre for Micro-Photonics

Optical trapping

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:

Optical stress (force per unit area) on a biconcave red blood cell under nearfield optical tweezers.

  • 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.

Research staff

Project leader: Associate Professor Xiaosong Gan