Optical waveguiding and nonlinear optical characterization of 2-docosylamino-5-nitropyridine Langmuir-Blodgett films

Well ordered Y-type Langmuir-Blodgett (LB) multilayers of 2-docosylamino-5-nitropyridine (DCANP) have been characterized with linear and nonlinear optical techniques. The nonlinear optical susceptibilities have been determined for the wavelengths λ = 1064 nm (d33 = (7.8±1) pm/V, d31 = (2.0 ± 0.5) pm/V) and λ = 1318 nm (d33 = (5.6 ± 1) pm/V). Waveguiding experiments with grating couplers allowed the excitation of TEo and TMo modes propagating over more than 20 mm. Guided wave attenuation coefficients as low as 12 dB/cm (at the wavelength λ = 632.8 nm) are reported. Coupling experiments allowed the determination of the dispersion of the refractive index n3 (n3632.8 nm = 1.598). The refractive index data could be used to calculate phase-matching conditions for frequency doubling with TE modes in DCANP waveguides.