252 / 2024-08-28 02:42:48

Scattering light in nanomaterials

Random laser, nanoparticle, scattering, quartzite, silica, cellulose

The investigation of the scattering of light in nano or submicron particles led to the study of a low-coherence photon source, the random laser (RL), in which the optical feedback relies on scattering processes. We demonstrated an RL system based on cellulose nanocrystalline (CNC) needles in a suspension containing rhodamine6G (Rh6G) in ethylene glycol (EG), presenting a higher efficiency when compared to other nanoparticle-based RL suspensions. Also, a self-supported hydroxypropyl cellulose (HPC) flexible film showed a slightly better performance and a similar threshold. The influence of the morphology of SiO₂ nanoparticle scatters for random laser efficiency was demonstrated, by comparison of the effect of two scattering centers, Quartzite nanoparticles (QtzNP - crystalline SiO₂) and amorphous silica nanoparticles, in a RL, associating the laser efficiency to the morphology, phase and refractive index (RI) of the scatterers. Finite Element Method (FEM) computational simulations were also performed, corroborating experimental findings.

The investigation of the scattering of light in nano or submicron particles led to the study of a low-coherence photon source, the random laser (RL), in which the optical feedback relies on scattering processes. We demonstrated a RL system based on cellulose nanocrystalline (CNC) needles in a suspension containing rhodamine6G (Rh6G) in ethylene glycol (EG), presenting a higher efficiency when compared to other nanoparticle-based RL suspensions. Also, a self-supported hydroxypropyl cellulose (HPC) flexible film showed a slightly better performance and a similar threshold. The influence of the morphology of SiO₂ nanoparticle scatters for random laser efficiency was demonstrated, by comparison of the effect of two scattering centers, Quartzite nanoparticles (QtzNP - crystalline SiO₂) and amorphous silica nanoparticles, in a RL, associating the laser efficiency to the morphology, phase and refractive index (RI) of the scatterers. Finite Element Method (FEM) computational simulations were also performed, corroborating experimental findings.