Investigation on third-order nonlinear optical properties of two Au(dmit)2/PMMA thin films by Z-scan technique in picosecond pulse regime

• Published in: Applied physics. A, Materials science & processing Materials science & processing, 2012-06, Vol.107 (4), p.829-833
• Main Authors: Fan, Heliang, Wang, Xinqiang, Ren, Quan, Li, Tingbin, Xu, Dong
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Condensed Matter Physics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Machines; Manufacturing; Nanotechnology; Optical and Electronic Materials; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of specific thin films; Physics; Physics and Astronomy; Polymers; organic compounds; Processes; Surfaces and Interfaces; Thin Films
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-012-6807-8

The third-order nonlinear optical properties of two Au(dmit) 2 /PMMA compound thin films, hexadecyltrimethylammonium bis(1,3-dithiole-2-thione-4,5-dithiolato)aurate and tetramethylammonium bis(1,3-dithiole-2-thione-4,5-dithiolato)aurate (abbreviated as MeAu and CtAu, respectively) with a doping concentration of 1 wt.% deposited on quartz-glass substrate were characterized by a single beam Z-scan technique at 1064 nm with 20 ps laser pulse width and 10 Hz repetition rate. The dominant nonlinear refraction and tiny nonlinear absorption of both materials lead to a larger possibility for them to be applied as promising candidates of all-optical switching. The results of two figures of merit, | W |≫1 and | T |≪1, were also calculated; this further validated the excellent properties of the materials for applications of the nonlinear optics.