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Published on: September 22, 2017
Blue-shifted random-laser-mode selection in gain-assisted anisotropic complex fluids
Alessandro Veltri1, Melissa Infusino, Sameh Ferjani
1LICRYL (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
Summary
Researchers developed a diffusive model for organic random lasers, linking dye-host interactions and scattering in complex fluids. This model explains the blue-shifted lasing mode observed in experiments.
Area of Science:
- Optics and Photonics
- Materials Science
- Physical Chemistry
Background:
- Random laser action in organic materials is a rapidly developing field.
- Active compounds and novel dye molecules are crucial for advancements.
- Understanding dye-host interactions and scattering is key to controlling laser properties.
Purpose of the Study:
- To propose a pure-diffusive model for organic random lasers.
- To elucidate the connection between dye-host interaction, scattering, and lasing.
- To explain the experimentally observed narrow-band blue-shifted lasing mode.
Main Methods:
- Developed a pure-diffusive model for anisotropic complex fluids.
- Incorporated multiple scattering via dielectric tensor fluctuations.
- Utilized a quantum mechanical description for light amplification.
Main Results:
- The model successfully explains the narrow-band blue-shifted lasing mode.
- Strong intermolecular forces enhance diffusive processes.
- Simulations show good agreement with experimental observations.
Conclusions:
- The proposed model advances the understanding of physical mechanisms in organic random lasers.
- Dye-host interactions and scattering play a critical role in mode selection.
- Further research can leverage this model for designing advanced organic laser systems.
