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Experimental evidence of an optical shuttering action in cholesteric phase of a double hydrogen bonded ferroelectric liquid crystal

V. N. VIJAYAKUMAR1, R, M . L. N. MADHU MOHAN1,*

Affiliation

  1. Liquid Crystal Research Laboratory (LCRL), Bannari Amman Institute of Technology Sathyamangalam 638 401, India

Abstract

A novel series of double hydrogen bonded liquid crystals have been isolated. Hydrogen bond was formed between non mesogen chiral ingredient levo tartaric acid (LTA) and mesogenic undecyloxy benzoic acids (11BA). Thermal and electrical properties exhibited by levo tartaric acid and undccyloxy benzoic acid (LTA+11BA) were discussed. Interesting feature of the present investigation was observation of an optical shuttering action in LTA+11BA hydrogen bonded complex on application of a stipulated applied dc bias voltage. By enhancement of the dc bias voltage the mesogen behaves like an optical shutter, thus this hydrogen bonded complex mesogen acts as an effective light modulator. It was noticed that this action of shuttering was reversible, in the sense that when applied bias voltage was removed the original texture was restored. Experimental results relating to textures, optical tilt, dielectric studies and optical shuttering action were presented.This optical shutter property of the mesogen can be exploited for commercial and display device applications..

Keywords

Hydrogen bonded liquid crystal, LTA+11BA, Optical shutter, Light modulator.

Submitted at: July 13, 2009
Accepted at: Aug. 7, 2009

Citation

V. N. VIJAYAKUMAR, R, M . L. N. MADHU MOHAN, Experimental evidence of an optical shuttering action in cholesteric phase of a double hydrogen bonded ferroelectric liquid crystal, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 8, pp. 1139-1146 (2009)