1. Liquid Crystal Research Lab, Physics Department, University of Lucknow, Lucknow, India
2. Unite de Dynamique et Structure des Materiaux Moleculaires (UDSMM), Universite du Littoral Cote d'Opale (ULCO), Rue Ferdinand Buisson, Calais Cedex, France
3. Experimental quantum polarization and optics lab, Physics department, Indian Institute of technology Delhi, Delhi, India