Improving the random lasing performance using Au@SiO2 nanocubes-silver film hybrid structure

Properties and Applications of Random Lasers as Emerging Light Sources and Optical Sensors: A Review

“…This is significant because the high-threshold laser emission usually hinders the further applicability of RLs; for example, applications in the biological field where the excitation intensity is required to be low to avoid photo-toxicity to tissues. In this regard, changing the shape of scatterers to increase the surface area [ 12 ] or optimizing the size of scatterers [ 92 ] can facilitate the scattering efficiency and, therefore, lower the RL threshold. In other reports, additional disorders were introduced into a spatial distribution of pump light to lower the RL threshold [ 84 , 85 ].…”

“…In other reports, additional disorders were introduced into a spatial distribution of pump light to lower the RL threshold [ 84 , 85 ]. The RL threshold can also be lowered by employing metal nanoparticles (NPs), in which, the surface plasmon resonance can enable a high gain for lasing even at a low excitation intensity [ 16 , 60 , 92 , 101 , 102 , 103 ]. Furthermore, external optical cavities such as the fiber structure [ 47 , 94 , 104 ], FP cavity [ 39 , 105 , 106 , 107 , 108 , 109 ] and WGM cavity [ 38 , 110 ] were proposed to enhance the optical feedback of RLs and eventually reduce the lasing threshold.…”

ASE from polymer films embedded with silver nanowires

“…It was reported that the threshold for random lasing may be greatly lowered by using a plasmonic hybrid structure. An example is using gold-silica (Au core-SiO2) shell nanocubes coated on silver (Ag) film (Au@SiO2 NCs-Ag film) [6]. However, all these works rely on liquid-based samples.…”

Synergy between plasmonic nanocavities and random lasing modes: a tool to dequench plasmon quenched fluorophore emission

“…26 It has been observed that replacing the dielectric scatterers with MNPs reduces the lasing threshold considerably, leading to plasmonic random lasers (PRLs). [27][28][29] The large scattering cross-section of MNPs leads to enhanced scattering, resulting in increased optical feedback, and the LSPR due to MNPs can lead to an enhanced excitation of the gain media. However, when a fluorophore (gain media) comes in the close vicinity of a plasmonic MNP, either quenching [30][31][32] or enhancement [33][34][35] of the fluorophore emission is observed due to their mutual interaction.…”