Abstract

We discuss a planar nematic liquid-crystal structure with the director periodically twisted in the light propagation direction (periodically twisted nematic) as a medium, which exhibits bandgap and strong reflection for any polarization at normal incidence. This is in contrast to the cholesteric liquid crystals, which reflect only one of the two circular polarizations. The size of the bandgap depends on the modulation profile and amplitude, and its maximal magnitude is smaller, but of the same order as the bandgap of cholesterics with similar material parameters (refractive indices and pitch). The second-order bandgap reflection exhibits polarization universality only for large enough modulation.

© 2006 Optical Society of America

Full Article  |  PDF Article

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 (4)

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 (45)

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

Metrics

You do not have subscription access to this journal. Article level metrics 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