Index grating surface anchoring

Alexander Agashkov; Anatoly Kovalev; Janusz Parka

doi:10.1117/12.622260

6 October 2005 Index grating surface anchoring

Alexander Agashkov, Anatoly Kovalev, Janusz Parka

Proceedings Volume 5947, Liquid Crystals: Optics and Applications; 59470X (2005) https://doi.org/10.1117/12.622260
Event: Congress on Optics and Optoelectronics, 2005, Warsaw, Poland

Abstract

A simple model describing location of Raman-Nath index grating photoexcited in a planar cell with photoconductive orienting layers is proposed. We believe that index grating vector is parallel to cell boundaries. One of the most important features resulting from this model is that the index grating spacing equals to projection of the exciting optical grating spacing on cell boundaries. The experimental study was carried out with 9 micrometer thick planar cell filled with nematic liquid crystal 6CHBT, activated by anthraquinone dyes. DC or square-wave AC field has been applied to the cell. Holographic gratings were recorded by two (signal + pump) or three (signal + 2 pumps) coherent p-polarized beams from He-Ne laser operating at 632.8 nm. The crossing angle between signal and pump beams and the sample tilting angle were chosen to satisfy "angular resonance". The tilting angle varied from 20° to 45°, high diffraction orders were observed up to angle 77°. Calculations on the basis of our model and experimental results are in good agreement. We also discuss and present explanation of the observed effects in geometry with 2 pump beams.

Citation Download Citation

Alexander Agashkov, Anatoly Kovalev, and Janusz Parka "Index grating surface anchoring", Proc. SPIE 5947, Liquid Crystals: Optics and Applications, 59470X (6 October 2005); https://doi.org/10.1117/12.622260

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available