Directional Second Harmonic Generation Controlled by Sub-wavelength Facets of an Organic Mesowire
Directional harmonic generation is an important property characterizing the ability of nonlinear optical antennas to diffuse the signal in well-defined region of space. Herein, we show how sub-wavelength facets of an organic molecular mesowire crystal can be utilized to systematically vary the directionality of second harmonic generation (SHG) in the forward scattering geometry. We demonstrate this capability on crystalline diamonoanthraquinone (DAAQ) mesowires with subwavelength facets. We observed that the radial angles of the SHG emission can be tuned over a range of 130 degrees. This angular variation arises due to spatially distributed nonlinear dipoles in the focal volume of the excit…
si-movie1.avi
The video describes the SHG signal from an organic meso wire under laser illumination. We show the generation of SHG from different facets of the wire by moving the illumination spot transversly accross the mesowire axis.
si-movie1.avi
The video describes the SHG signal from an organic meso wire under laser illumination. We show the generation of SHG from different facets of the wire by moving the illumination spot transversly accross the mesowire axis.