A Spectroscopic Study on the Nonlinear Optical Susceptibilities of Organic Molecules

We report on the investigation of the spectral dependence of nonlinear optical susceptibilities, that describe second harmonic generation - circular dichroism, the nonlinear optical analogue of circular dichroism. The design and implementation of a state of the art experimental setup, used for the characterization of a series of organic molecules in the near-infrared range, will be discussed. We emphasize on the main characteristics like wavelength control, polarization and data-acquisition to present the setup. Some preliminary results show its strength to detect chirality at the molecular and supramolecular level

Nonlinear-optical studies of magnetic dipole metamaterials

Second harmonic generation in planar arrays of metal-dielectric-metal nanodiscs in the spectral vicinity of magnetic dipole plasmon resonance is experimentally studied. Observed features allow to reveal the mechanism of nonlinear-optical response

Coherent and incoherent second harmonic generation in planar G-shaped nanostructures

Azimuthal anisotropy of Stokes parameters of the second harmonic generation ( SHG) generated and observed in reflection from a periodic planar area of G-shaped gold nanostructures is studied. A strong anisotropy of both coherent and incoherent SHG components is observed. Finite-difference time-domain calculations prove that the observed effects are due to the anisotropic enhancement of the fundamental radiation within the G-shaped structures. (C) 2011 Optical Society of Americ