Advanced Undergraduate Laboratory

Department of Physics

University of Toronto

OPT: Optical Tweezers

Laser trapping of neutral particles is a powerful tool for studying everything from atoms to bacteria. Optical Tweezers are a trapping method for microscopic particles, and with our new apparatus you will initially try to trap and study the forces on microscopic plastic spheres.

Write-Up in Word (docx) and PDF Format.

(The experiment is currently located in MP248; last write-up revision: February 2019.)


This apparatus must not be disassembled in any way. It contains a powerful laser that could damage your eyes if the apparatus is altered in any way. You must receive safety instruction from the supervising professor before touching the equipment.

Some additional resources:

Photo of Optical Tweezers Apparatus

Optical Tweezers Apparatus

Last updated on 8 October 2019