Surface-emitted green light generated in Langmuir–Blodgett film waveguides

Abstract
We demonstrate second‐harmonic generation due to counterpropagating beams in planar waveguides of 2‐docosylamino‐5‐nitropyridine (DCANP). The DCANP molecules were deposited by Langmuir–Blodgett techniques and have a preferred alignment within the substrate plane. Four‐layer waveguide structures were used to optimize the trade‐off between propagation loss and efficient surface‐emitted green light.