Large electro-optic effects of liquid-crystal materials are attractive in applications to various optical devices in a wider wavelength region. Fundamental optical properties in the submillimeter wave region, such as refractive indices and transmission losses for some cyanobiphenyl nematic liquid crystals, have been investigated for the first time, to our knowledge, with a submillimeter laser. Refractive indices of the liquid crystal materials for ordinary and extraordinary rays are a little larger than those in the visible region, and a larger birefringence comparable with the visible region can also be obtained. Although the loss level is larger by ∼2 orders of magnitude than that of quartz plate, which is an excellent window in the submillimeter wave region, the transmission of the liquid crystal cell is high enough.
© 1997 Optical Society of America
Original Manuscript: October 17, 1996
Revised Manuscript: December 11, 1996
Published: September 1, 1997
Toshiaki Nose, Susumu Sato, Koji Mizuno, Jongsuck Bae, and Tatsuo Nozokido, "Refractive index of nematic liquid crystals in the submillimeter wave region," Appl. Opt. 36, 6383-6387 (1997)