Chiral Fiber Gratings
Victor I. Kopp,1*
Victor M. Churikov,1
Jonathan Singer,1
Norman Chao,1
Daniel Neugroschl,1
Azriel Z. Genack1,2
Chiral gratings with double helix symmetry were produced by twisting glass optical fiber with a noncircular core cross section as it passed through a miniature oven. We observed polarization-selective transmission in chiral fibers with pitches of tens of micrometers. Two modes of optical interaction were differentiated. In chirallong-period gratings, dips in transmission were observed at wavelengths associated with scattering into distinct cladding modes mediated by the chiral grating. In chiral intermediateperiod gratings, a broad scattering band was observed. These gratings can be used to produce sharp or broad polarization-selective filters.
1 Chiral Photonics, Inc., Clifton, NJ 07012, USA.
2 Department of Physics, Queens College, City University of New York, Flushing, NY 11367, USA.
* To whom correspondence should be addressed. E-mail: vickopp{at}chiralphotonics.com
