Experimental observation of enhanced reverse saturable absorption in Bi ₂ Se ₃ nanoplates doped PMMA thin film

Abstract By employing the ultrafast Z-scan technique, we characterize nonlinear absorption property of PMMA/Bismuth Selenide ( Bi 2 Se 3 ) composite with varying concentrations. We report fabrication bismuth selenide nanoplate (topological insulator (TI)) doped poly methyl methacrylate (PMMA) thin film doping The effect on structural and linear properties PMMA has been investigated through UV-Vis spectroscopy, scanning electron microscope (SEM), Energy dispersive x-ray spectroscopy (EDS) elemental mapping techniques. Furthermore, optical PMMA/ composites have performed a single beam open aperture z-scan technique under femtosecond laser excitation at 750 nm. results exhibit an enhancement reverse saturable (RSA) increased coefficient β compared to pure measured intensity 320 GW cm −2 . RSA response gets enhanced increase in concentration also. Our experimental observations reveal that can provide promising platform realize photonic devices such as limiters, switches, efficient protectors from high power sources.