Tuesday, 17 June 2014, 11:00 a.m.
Sala Grande Palazzina B via alla Cascata 56/C
Multi-harmonic generation in microstructured ferroelectrics
Laser Spectroscopy Research Group, Department of Physics of Materials,
University Autonoma of Madrid, Spain
Ferroelectric patterning is often used in advanced photonics and optoelectronic devices to increase their operational bandwidth and functionality providing novel and unique performances. In fact, alternate ferroelectric domains structures with increasingly smaller sizes and periods are ever more required to control the generation and light distribution in several scientific and technologically relevant fronts.
Here, careful processing based on e-beam lithography and poling has been employed to demonstrate a step forward in the range of harmonic generation with currently available broadband sources in the VIS-NIR. We experimentally show the possibility to obtain widely tunable simultaneous second to fifth harmonic generation of conical waves by combining multiple quasi-phase matching interactions in a fully dense square lattice of alternate ferroelectric domains with a poling period ~2 µm, which represents the shortest period achieved in 2D bulk optically active LiNbO3 crystal. Together, the results highlight the outstanding opportunities offered by patterned ferroelectrics as innovative avenues to manipulate the light generation and control with reliable multifunctional optical character.