Spectroscopy Existing behind the Electro-Optical Properties with an Even-Odd Effect of nCB Liquid Crystal Molecules: A Theoretical Approach

N. Kumara, P. Singha, S. Chaudharya, K.B. Thapaa, P. Upadhyayb, A.K. Dwivedic, D. Kumara aDepartment of Physics, School of Physical and Decision Sciences, Babasaheb Bhimrao Ambedkar University, Vidya Vihar, Raebareli Road, Lucknow (U.P.) 226025, India bDepartment of Physics, Sri J.N.P.G. College (KKC), Charbagh, Lucknow-226001, India cDepartment of Physics, M.L.K.P.G. College, Balrampur (U.P.) 271201, India

Received: November 27, 2019; in final form February 4, 2020

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In this work, we have studied the effect of the external electric field on the nCB series with an extension of the alkyl chain length of liquid crystal molecules. The stretching of C-C and C-H atom contributes to the anisotropy of polarizability for the new compound of the nCB series. The molecular polarizability is responsible for an even-odd effect of the optical parameters. The electric field is another method (alternative of temperature) to find out the optical parameters of the liquid crystal series. Under the impact of an external electric field, the order parameter and birefringence are expression of an even-odd effect. The transition temperature and birefringence enhance for the odd member and reduce for even members of the alkyl chain. The birefringence decreases with an even-odd effect while the order parameter increases with minor deviation.

DOI:10.12693/APhysPolA.137.1135 topics: nCB liquid crystal, electric field, order parameter, birefringence, spectroscopy