Dynamic random lasing in silica aerogel doped with rhodamine 6G

Abstract

Silica aerogel is a lightweight material, well known for its good mechanical and thermal characteristics, but its optical properties have received less attention, because it is weakly scattering. Here we present for the first time the lasing properties and their complex dynamics of silica aerogel doped with R6G. It is shown that the Q factors of the lasing modes determine the operation of the laser, being either resonant or ASE-lasing.For resonant lasing, the number of resonators is easily varied and the number of modes in a single resonator and their emission frequency can be dynamically adjusted, making this a truly versatile photonics material.

Engineered protein-based functional nanopatterned materials for bio-optical devices

“…64,65 Our approach benets from a combination of enhanced Rh6G emission in the solid state and efficiently supported feedback provided by the highly dened periodical patterning. 66 Owing to its large uorescence quantum yield (0.94) 67 and outstanding optical gain properties, Rh6G has been the choice as the optical gain medium to develop optically-pumped lasers upon its dispersion on a myriad of organic matrices including for instance mesoporous silica, 68,69 aerogels, 70,71 latex, 72 PMMA, 73 methyl methacrylate copolymers, 74,75 cellulose nano-bers 76 or cellulose acetate, 77,78 among many others. The solidstate biological lasing platform demonstrated in this work offers attractive assets for integration of light sources in biological media aiming for instance at in vivo imaging or diagnosis.…”

Random Lasing Emission of ZnO Nanorods from Different Seeding Thickness

“…4(a) and 4(b), stimulated emission from the samples represented by sharp peak in intensity were results from coherent feedback that formed localized states and the action of optical confinement is indicated by occurrence of RL emission [28]. Whilst the smallest value for the peak to appear indicates threshold of RL emission [29]. In comparison, the first sample growth from 100 nm seed layer has the lowest threshold and RL peak starts to appear at excitation power density of 37.86 kW/cm 2 , while the other sample shows close to triple of threshold value at excitation power density of 4(c), the first sample with higher density achieved the lowest lasing threshold, as compared to the second sample.…”

Concentration-Dependent Emission of Annealed Sol-Gel Layers Incorporated with Rhodamine 19 and 6G as the Route to Tunable High-Temperature Luminescent Materials

“…The reactions are often carried out at room temperature, enabling the stable incorporation of organic dyes without losing their spectroscopic properties. These materials are used in lasers [ 4 ], solar panels [ 5 ], numerous optical sensors [ 6 , 7 , 8 ], and drug delivery [ 9 ]. Despite the exceptional spectroscopic properties of organic dyes, the sol-gel technology faces problems not observed in doping with inorganic compounds.…”