Nonlinear organic liquids that exhibit two-photon absorption (TPA) function as a good optical limiters for sensor protection from laser pulses. L34 (4-butyl-4'-propyl-diphenylethyne) is a liquid organic compound exhibiting nonlinear optical absorption. A thiol- derivatized analog (thiol-L34) of L34 was prepared to bind the molecules to the surface of gold nanoparticles. Surface binding is necessary to investigate synergy between nonlinear optical absorption of gold nanoparticles and thiol-L34.  Thiol-L34 was prepared in a six-step organic synthesis starting from 3-(4-bromophenyl) propionic acid. The compounds were characterized by physico-chemical methods (elemental analysis, 1H-NMR, 13C-NMR, MS, IR). Au nanoparticles with <15 nm diameter have been prepared and sensitized with the thiol-L34 compound for assessment of their nonlinear optical behavior.

Preparation of a colloidal optical-limiting material based on diarylalkyne-sensitized gold nanoparticles

247th National Meeting (2014)

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