title: Blue-shifted random-laser-mode selection in gain-assisted anisotropic complex fluids.
abstract: Random laser action in organic materials is of great topical interest that is fueled by the rapid development of active compounds and new dye molecules. We propose a pure-diffusive model to describe the strong connection established between a dye-host interaction and the scattering when considering an anisotropic complex fluid. The model considers multiple scattering induced by dielectric tensor fluctuations and a suitable quantistic description for light amplification in order to explain the generation of the narrow-band blue-shifted lasing mode experimentally observed in such systems. We also find that the introduction of a strong intermolecular force field provides the condition to enhance diffusive processes. The agreement between experimental observations and simulations advances the understanding of the physical mechanism behind mode selection in these systems.
authors: LICRYL (Liquid Crystal Laboratory), National Institute for the Physics of Matter (INFM-CNR), Center of Excellence CEMIF.CAL and Department of Physics, University of Calabria, I-87036 Arcavacata di Rende (CS), Italy. alessandro.veltri@fis.unical.it
authors: Alessandro
authors: A
authors: Veltri
authors: Melissa
authors: M
authors: Infusino
authors: Sameh
authors: S
authors: Ferjani
authors: Antonio
authors: A
authors: De Luca
authors: Giuseppe
authors: G
authors: Strangi