Chiral fiber gratings.
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.
Kopp
Victor I
VI
Chiral Photonics, Inc., Clifton, NJ 07012, USA. vickopp@chiralphotonics.com
Churikov
Victor M
VM
Singer
Jonathan
J
Chao
Norman
N
Neugroschl
Daniel
D
Genack
Azriel Z
AZ