Optical bistability of an optical waveguide coated with nonlinear Langmuir-Blodgett films

A 30 layer copper tetra-4-(2,4-di-t-amylphenoxy)phthalocyanine(tapCuPc) film was deposited onto an optical glass waveguide of K ion-exchanges by the Langmuir-Blodgett (LB) technique. A four-layer dielectric waveguide with a LB film cladding was formed. Optical bistability of the optical waveguide coated with nonlinear tapCuPc LB film was observed at room temperature for the first time.