Non Linear Optical Properties of Banana Shaped Liquid Crystals

Abstract

We report the nonlinear absorption and refraction of banana shaped liquid crystal, namely 1,3-phynelyne bis [N-(2-hydroxy-4-n-decyloxy-benzylidene)-4′-aminobenzoate] using Z-scan technique. The measurements were carried out using a Q-switched, frequency doubled Nd:YAG laser producing 7 nanosecond laser pulses at 532 nm. The Z-scan result shows that the compound exhibits negative non-linearity. The nonlinear refractive index and nonlinear absorption coefficient of this compound were found to be −1.283 × 10⁻¹¹ esu and 2.232 cm/GW, respectively. The real and imaginary parts of the third-order nonlinear optical susceptibility were of the order of 10⁻¹³ esu. The results suggest that these molecules are potential nonlinear optical materials for device applications.

Keywords:

• Banana shaped liquid crystal
• nonlinear optical property
• Q-switching
• Z-scan

Acknowledgment

We thanks the UGC for financial support to carryout this project.