Surface-enhanced optical third-harmonic generation (THG)is observed in silver island films. The THG intensity from 2-D array of silver nanoparticles is enhanced by two orders of magnitude and the enhancement is attributed to the local field resonance at third-harmonic wavelength mediated by excitation of the local surface lasmons.
Incoherent: diffuse and depolarized,component of the enhanced third harmonic generation (THG)intensity is associated with the third-order hyper-Rayleigh scattering (HRS)in 2-D random ensemble of silver nanoparticles. A comprehensive analysis of the linear and nonlinear light scattering in combination with the results of atomic force microscopy revealed the fractal nature of the silver island films.
The enhancement of the second-harmonic generation (SHG) in all-silicon coupled microcavities (CMC) based on one-dimensional photonic crystals is experimentally studied. CMC are fabricated from alternating layers of electrochemically grown mesoporous silicon and consist of two identical half-wavelength-thick cavity spacers separated by additional porous silicon photonic crystal. The enhancement of the second-harmonic response of CMC in the vicinity of splitted cavity modes is experimentally observed in both angular (wave vector) and frequency domain spectra. The variation of transmission of the intermediate photonic crystal, which controls the interaction between coupled cavity spacers, leads to monotonic dependence of the SHG resonances splitting on the number of pairs of the intermediate Bragg reflector.
Incoherent second-harmonic (SH) and third-harmonic (TH) generation, or hyper-Rayleigh scattering (HRS) on SH and TH, is proposed as a probe of nonlinear-optical properties of silver island films (SIF). HRS on SH and TH indicatrices and linear (Rayleigh) scattering (RS) indicatrices are measured. By the atomic force microscopy (AFM) we apply to study the surface topographic inhomogeneity. The density-density correlation function which describes the correlation of the spatial nonlinear susceptibilities fluctuations is derived from the AFM images of SIF. The interpretation of the experimental results is based on the correlation between optical ) properties and structural
features of SIF.
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