A chiral liquid, whose constituent molecules lack mirror symmetry, exhibits a minor differential refractive index (RI) between the two circular polarization components. Theoretical analysis shows that the ultrahigh-order modes excited in a symmetrical metal-cladding waveguide (SMCW) are polarization-independent and have a highly sensitive response to the RI variation. We report the observation of circular differential reflectivity in a chiral liquid-filled SMCW and propose an alternative simple technique capable of determining enantiomeric excess with high sensitivity.
© 2013 Optical Society of America
Original Manuscript: August 8, 2013
Revised Manuscript: September 10, 2013
Manuscript Accepted: September 10, 2013
Published: October 9, 2013
Xianping Wang, Cheng Yin, Honggen Li, Minghuang Sang, Wen Yuan, and Zhuangqi Cao, "Ultrahigh-order mode-assisted determination of enantiomeric excess in chiral liquids," Opt. Lett. 38, 4085-4087 (2013)