Magnetically tunable random lasing from polymer dispersed liquid crystal doped ferromagnetic nanoparticles in capillary

Abstract

In this paper, magnetically tunable random lasing from a polymer dispersed liquid crystal (PDLC) in a capillary was achieved by means of doping with magnetic nanoparticles (MNPs). We experimentally explored the effects of the concentration of MNPs and the amplitude and direction of the magnetic field on the emission properties of random lasing, such as threshold, envelope of the emission spectrum, and intensities. The related mechanism was also investigated theoretically. Experimental results also showed that weakly tuned effects appeared from the sample with a polymer or pure liquid crystal (LC) doped with MNPs in comparison with PDLCs. Our research would provide an additional way to achieve tunable compact LC-based lasers.

Recent progress and prospects of random lasers using advanced materials

“…141 , and it is made of a laser dye and scatterers (TiO 2 + Fe 3 O 4 NPs) that can be controlled magnetically. Other exotic works also use magnetic nanoparticle scatterers to control and observe random lasing emission 142,143 .…”

“…Other exotic works also use magnetic nanoparticle scatterers to control and observe random lasing emission. 142,143 5.2.3. Electrically controlled random lasers.…”

Dye-Doped Fe3O4 Nanoparticles for Magnetically Controlling Random Laser Parameters at Visible Wavelengths: Literature Review and Experiment

“…Thus, the lasing emission of the MCRLs can be switched on/off with great responsivity and durability by installing/removing the magnet. Some researchers fabricated a magnetically tunable random laser (Dai et al, 2019). In this case, polymer-dispersed liquid crystal (PDLC) in the capillary was achieved by employing doping magnetic NPs at varied pump energies.…”