Saturable Absorption and Self-Defocusing Response of Hippuric Acid-PMMA Organic Nanofiber for Nonlinear Optical Applications

HA-PMMA organic nanofiber was drawn using electrospinning technique in which organic guest orthorhombic structure Hippuric Acid (HA) embedded inside host polymer Poly (methyl methacrylate) (PMMA). SEM results show the drawn HA-PMMA fiber matrix was well-aligned, uniform, and beadless. The average diameter of HA-PMMA nanofiber is 135.4 nm. The average crystalline size of HA-PMMA fiber matrix is 20.67 nm. The transparency of the visible region of the HA-PMMA nanofiber was confirmed using UV-Vis spectroscopy study. SHG response of the sample was confirmed by the generation of green light under 1064 nm laser excitation using Kurtz-Perry powder setup. Z-scan measurements for the third-order intensity dependent optical characteristics were analysed using a continuous green wave laser. From the Z-scan test, a Gaussian beam obtained by open aperture (OA) confirms the saturable absorption property and closed aperture (CA) confirms the self-defocusing response of HA-PMMA nanofiber. These intriguing third-order nonlinear results confirm that HA-PMMA nanofiber may find use in photonics and optoelectronics.