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

Abstract

Optical second-harmonic generation (SH G ) spectroscopy and hyper-Rayleigh scattering (H R S) were studied in thin Langmuir-Blodgett films o f fullerenes. For films above five monolayers a coherent SHG signal was observed, whereas a onemonolayer film only produced HRS. The HRS indicatrices were measured, and a correlation length of the non-linear polarization o f about 100 nm was obtained.The increase in SHG intensity for C60-CN films in comparison with that o f C60 films is well pronounced, particularly at the blue end o f the SHG spectra, and is attributed to a resonant surface electric-dipole contribution. © 1997 Elsevier Science B.V.

Lysozyme adsorption on carbonaceous nanoparticles probed by second harmonic light scattering

“…16 Both coherent and incoherent second harmonic generation (SHG) have been reported from fullerene although in the first approximation, fullerenes, because of their spherical shape having a center of symmetry, are not supposed to generate an electric dipole allowed SH signal. However, higher order effects and inhomogeneity of the spherical surface make SHG in fullerenes sustainable 18 and the response is resonance-enhanced. Thus, we first measured the first hyperpolarizability ( β ) of CNPs and observed that CNPs are good scatterers of second harmonic (SH) light.…”

Second Harmonic Generation of C60Incorporated in Alkali Metal Ion Zeolites and Mesoporous MCM-41 Silica

“…21,22 Despite its molecular symmetry, it is known that films of C 60 exhibit SHG activity arising from magnetic dipoles and electrical quadrupoles within the crystals. [23][24][25][26][27][28] Herein, we have prepared a series of powders containing C 60 adsorbed inside the pores of zeolites and MCM-41 aluminosilicates and observed an enhanced SHG activity as a result of C 60 encapsulation. The relative SHG efficiency has been found to depend on the structure and composition of porous host.…”

Nonlinear optical interferometry and second harmonic generation spectroscopy of Langmuir films of fullerene-indopane derivative

“…solid films on a substrate is studied using the SHG The second harmonic generation (SHG) techspectroscopy and interferometry. As a model nique was shown to be a rather simple and inforsystem the C 60 -indopane derivative (C 60 -IND) mative tool to study the structure, symmetry and films fabricated by the Langmuir-Schaefer (LS) morphology of interfaces and very thin (down to technique is chosen, in the range of film thickness monolayers) films [1][2][3]. In particular, SHG of 1-15 layers.…”