In-situ diagnostics of the crystalline nature of single organic nanocrystals by nonlinear microscopy

摘要

We elucidate the crystalline nature and the three-dimensional orientation ofisolated organic nanocrystals embedded in a sol-gel matrix, using a polarizednonlinear microscopy technique that combines two-photon fluorescence and secondharmonic generation. This technique allows the distinction betweenmono-crystalline structures and nano-scale poly-crystalline aggregatesresponsible for incoherent second harmonic signals.