Optical second-harmonic generation with coupled surface plasmons from a multilayer silver-quartz grating

Second-harmonic generation in resonant waveguide gratings incorporating ionic self-assembled monolayer polymer films

Experimental results on resonantly excited second-harmonic generation (SHG) in a periodic ionically self-assembled monolayer (ISAM) film are reported. A double-layer guided-mode resonance filter (GMRF) structure is coated with 40 bilayers of pyrlium-based chi(2) ISAM thin film and excited with the fundamental of a Nd:YAG laser. Enhanced second-harmonic conversion in the ISAM film is achieved because of the local field enhancement associated with the fundamental resonating leaky mode. This method of SHG is particularly promising, as the ISAM films under investigation exhibit anomalous dispersion that may be applied for phase matching to improve nonlinear conversion efficiency.

Experimental results of second-harmonic generation from a polyurethane waveguide on a silver grating coupler

Second-harmonic generation by excitation of guided modes and the surface plasmon in a polyurethane-coated silver grating coupler is presented. In order to study the spectral dependence of the second-harmonic efficiency, two different pump wavelengths are used, 1064 and 1319 nm. For the longer-wavelength pump we observe a large enhancement of the second-harmonic efficiency as the incident angle is scanned through an electromagnetic resonance, whereas for the shorter-wavelength pump the second-harmonic wavelength falls within the absorption band of the polymer, and we observe unexpected minima instead of maxima.