Abstract

Time-resolved (TR) spectra of 5CB in the millisecond domain were obtained during excitation with electric fields of different time dependence: ac, dc, and ac + dc. The response to ac excitation occurs mainly at twice the modulating frequency. The effect of the addition of dc to an ac field is the induction of an additional response at the ac frequency. The additional 'single frequency' response persists indefinitely, even though the response to the application of only a permanent dc field relaxes within roughly 200 ms. The amplitude of the oscillating responses diminishes with increasing ac frequency. This result is in accordance with the expected response to the torque exerted by the ac field. Different functional group absorptions respond without a significant phase difference in this time scale.

DC-field-assisted grating formation and nonlinear diffractions in methyl-red dye-doped blue phase liquid crystals

Iam Choon Khoo
Opt. Lett. 40(1) 60-63 (2015)

AC electric field assisted photo-induced high efficiency orientational diffractive grating in nematic liquid crystals

Liang Song, Wing-Kee Lee, and Xiaosheng Wang
Opt. Express 14(6) 2197-2202 (2006)

Terahertz time-domain spectroscopy studies of the optical constants of the nematic liquid crystal 5CB

Tsong-Ru Tsai, Chao-Yuan Chen, Ci-Ling Pan, Ru-Pin Pan, and Xi-Cheng Zhang
Appl. Opt. 42(13) 2372-2376 (2003)

Electro-optic response of chromophores in a viscoelastic polymer matrix to a combined dc and ac poling field

Kim G. Jespersen, Thomas G. Pedersen, and Per Michael Johansen
J. Opt. Soc. Am. B 20(10) 2179-2188 (2003)

Second-order nonlinear optical effects in novel side-chain liquid crystalline polymers and monomers under bias of an applied dc electric field

W. M. K. P. Wijekoon, Y. Zhang, S. P. Karna, P. N. Prasad, A. C. Griffin, and A. M. Bhatti
J. Opt. Soc. Am. B 9(10) 1832-1842 (1992)