The twist numbers of circular optical Möbius strips and twisted ribbons are shown to obey the index theorem under rotation of the plane of observation, and under change in the radius of the path.
© 2011 Optical Society of America
Original Manuscript: September 20, 2011
Revised Manuscript: October 11, 2011
Manuscript Accepted: October 15, 2011
Published: November 22, 2011
Isaac Freund, "Optical Möbius strips, twisted ribbons, and the index theorem," Opt. Lett. 36, 4506-4508 (2011)