Manipulating Micron-Sized Particles
Submission Type
Event
Expected Graduation Date
2013
Location
Atrium, Center for Natural Sciences, Illinois Wesleyan University
Start Date
4-20-2013 2:00 PM
End Date
4-20-2013 3:00 PM
Disciplines
Physics
Abstract
In this study, we trapped a micron-sized dielectric particle using a technique known as Optical Tweezers. A focused laser created a potential ‘well’ that catches and holds onto a selected bead near the laser’s focal point. Various sizes of silica beads (~1-16 μm diameter) were successfully trapped (even at relatively low power levels), as well as micro-droplets of birefringent liquid crystals. Using a quarter waveplate, we circularly polarized our laser beam, and then demonstrated that such beams possess angular momentum, by transferring some of that angular momentum to the liquid crystal micro-droplets. Besides SAM, beams may be created which contain orbital angular momentum (OAM). Future studies may include adding OAM using a spatial light modulator to laser beam, and implementing another optical trap to create a dual-trap system.
Manipulating Micron-Sized Particles
Atrium, Center for Natural Sciences, Illinois Wesleyan University
In this study, we trapped a micron-sized dielectric particle using a technique known as Optical Tweezers. A focused laser created a potential ‘well’ that catches and holds onto a selected bead near the laser’s focal point. Various sizes of silica beads (~1-16 μm diameter) were successfully trapped (even at relatively low power levels), as well as micro-droplets of birefringent liquid crystals. Using a quarter waveplate, we circularly polarized our laser beam, and then demonstrated that such beams possess angular momentum, by transferring some of that angular momentum to the liquid crystal micro-droplets. Besides SAM, beams may be created which contain orbital angular momentum (OAM). Future studies may include adding OAM using a spatial light modulator to laser beam, and implementing another optical trap to create a dual-trap system.