"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

Study on laser-induced ripple structures in dye-doped liquid crystal films in high-intensity regime

I. PALARIE1, C. DASCALU2,* , G. E. IACOBESCU1

Affiliation

  1. Faculty of Physics, University of Craiova, 13 A. I. Cuza Str., Ro 200585, Craiova, Romania
  2. Physics Department, Faculty of Applied Science, University “Politehnica” of Bucharest, 313 Splaiul Independentei, Bucharest, Romania

Abstract

The photoalignment effect induced by an Ar+ linearly polarized laser beam on a dye-doped nematic liquid crystal in a pumpprobe experiment is investigated. A symmetric capillary cell with two polymer coated glasses was used. An easy axis was induced by rubbing both surfaces in the same direction. The exciting Ar+ laser beam has the polarization direction perpendicular to the easy axis. The time dependent transmitted intensity of the probe He-Ne laser beam (polarized parallel to the easy axis) has been measured for various power of Ar+ laser in high-intensity regime and the beginning time of the ripple structure formation has been estimated. The spacing and the depth of the ripple structure were measured by using atomic force microscopy..

Keywords

Dye-doped liquid crystal, Ripple structure, Atomic force microscopy.

Submitted at: Dec. 15, 2009
Accepted at: Jan. 20, 2010

Citation

I. PALARIE, C. DASCALU, G. E. IACOBESCU, Study on laser-induced ripple structures in dye-doped liquid crystal films in high-intensity regime, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 1, pp. 115-118 (2010)