Second-harmonic generation spectroscopy and hyper-Rayleigh scattering in Langmuir-Blodgett films of fullerenes

[摘要] Optical second-harmonic generation (SHG) spectroscopy and hyper-Rayleigh scattering (HRS) were studied in thin Langmuir-Blodgett films of fullerenes. For films above five monolayers a coherent SHG signal was observed, whereas a one-monolayer film only produced HRS. The HRS indicatrices were measured, and a correlation length of the non-linear polarization of about 100 nm was obtained. The increase in SHG intensity For C-60-CN films in comparison with that of C-60 films is well pronounced, particularly at the blue end of the SHG spectra, and is attributed to a resonant surface electric-dipole contribution. (C) 1997 Elsevier Science B.V.

[发布日期] 1997-06-20

[关键词] fullerenes;second harmonic generation;surface structure