Macromolecular Systems I & II           cmclogo.gif (7533 bytes)   

 

 

In this project, a cylindrical glass tube is filled with corn syrup (which is optically active) and a small amount of latex particles (to help scatter).  As vertically polarized light progresses down the tube, the scattering donut rotates about. 

The setup, lights on.  Effect is visible! Lights out.
Richard Stein (wife Judy behind him) attended the SAACS meeting the day this was demonstrated. Mohan Srinivasarao, shown here in 2004 in Austin, TX, eating great Mexican food, suggested this demo. 
   

What do we learn? 

  1. Optically active materials rotate light.
  2. The donute effect is visible.

Question:  What if we rotated the laser mechanically?