Enhancement of random lasing assisted by Ag nanoparticle doped dye medium in solidified fiber

Abstract

We have studied the random laser action from a Ag nanoparticle (NP) doped Rhodamine-B dye medium in different structures: cuvette, liquid crystal cell, fiber. For Ag NPs at a concentration of 50 μg ml−1, a much lower threshold of 0.15 mJ cm−2 was observed from the Ag NP doped Rhodamine-B dye medium in optical fiber. The experimental results indicate that the reduction of the threshold energy is due to the combination of localized surface plasmon resonance (LSPR) enhancement effects from the Ag NPs and the confinement effect of the fiber structure. Meanwhile, the solidification of the dye solution makes the lasing mode stable and the emission intensity higher.