Abstract

A macroscopic theory is developed to explain the intense and highly structured circular dichroism (CD) and optical rotary dispersion (ORD) measurements of cholesteric liquid crystals in spectral regions of absorption, e.g., in the infrared. Oseen’s helical model of the dielectric tensor of the liquid crystal is used. The effects of each absorption band are represented by frequency-dependent, complex terms in the dielectric tensor. Assuming reasonable values for the absorptive parameters of the band, we are able to explain the magnitude and shape of the CD and ORD spectra, as well as their trends with the pitch of the helix. The calculated sign of the Cotton effect is shown to depend upon the direction of polarization of the absorption band with respect to the background birefringence. The observed preponderance of bands with one sign is qualitatively explained on the basis of the molecular structure of the liquid crystal.

© 1973 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Thickness-independent dynamics in cholesteric liquid crystals

Yo Inoue, Mayo Hattori, and Hiroshi Moritake
Opt. Express 25(4) 3566-3577 (2017)

Enhanced light absorption using optical diodes based on cholesteric liquid crystals

Efthymios Kallos, Vassilios Yannopapas, and Demetri J. Photinos
Opt. Mater. Express 2(10) 1449-1461 (2012)

Theory of light reflection by cholesteric liquid crystals possessing a pitch gradient

Leslie E. Hajdo and A. Cemal Eringen
J. Opt. Soc. Am. 69(7) 1017-1023 (1979)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (3)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (25)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription