Reverse Saturable Absorption in Substituted Hydrazones and Its Structure-Property Relationship for Photonic Applications

Abstract

The third-order nonlinear optical properties of three hydrazone derivatives, namely, ethyl 2-((2E)-2-(4-(dimethylamino)benzylidene]hydrazinyl)-5-nitrobenzoate, ethyl 2-((2E)-2-(4-chlorobenzylidene)hydrazino)-5-nitrobenzoate, and methyl 5-nitro-2-((2E)-2-(4-nitrobenzylidene)hydrazino)benzoate were investigated by the single beam Z-scan technique with nanosecond laser pulses at 532 nm. The compounds were doped into PMMA (poly (methyl methacrylate)), and their third-order nonlinearity was studied with a prospective of reaching a compromise between processability and high nonlinear optical behavior. The optical limiting study of the samples was carried out at 532 nm. The measured values of the third-order nonlinear susceptibility, χ(3), and the nonlinear refractive index, n 2 , are of the order of 10 − 13 esu and 10 − 11 esu , respectively. The nonlinear absorption in materials was attributed to reverse saturable absorption. The results are quite promising for possible applications in photonic devices.

Pulsed laser ablation technique prepared gold nanoparticle in zinc tetraphenyl porphyrin for enhanced nonlinear optical response

“…They are charge transfer compounds which are susceptible to enormous molecular nonlinearity enhancement by the introduction of the noble metal nanoparticle at molecular chains' ring centre and the functionalization executed at the peripheral locations. Hence, they are interesting systems to design compounds with large third order nonlinear optical properties [8,9]. Through molecular engineering, the physical, chemical, and thermal properties of porphyrin molecule can be enhanced.…”