Broadband plasmonic silver nanoflowers for high-performance random lasing covering visible region

Abstract

Multicolor random lasing has broad potential applications in the fields of imaging, sensing, and optoelectronics. Here, silver nanoflowers (Ag NF) with abundant nanogaps are fabricated by a rapid one-step solution-phase synthesis method and are first proposed as effective broadband plasmonic scatterers to achieve different color random lasing. With abundant nanogaps and spiky tips near the surface and the interparticle coupling effect, Ag NFs greatly enhance the local electromagnetic field and induce broadband plasmonic scattering spectra over the whole visible range. The extremely low working threshold and the high-quality factor for Ag NF-based random lasers are thus demonstrated as 0.24 MW cm −2 and 11,851, respectively. Further, coherent colorful random lasing covering the visible range is realized using the dye molecules oxazine (red), Coumarin 440 (blue), and Coumarin 153 (green), showing high-quality factor of more than 10,000. All these features show that Ag NF are highly efficient scatterers for high-performance coherent random lasing and colorful random lasers.

Flexible and smart fibers decorated with Ag nanoflowers for highly active surface‐enhanced Raman scattering detection

“…The RGO fibers in Figure b act as a reaction platform where the silver ions are reduced to elemental silver by ascorbic acid, and Ag 0 selectively agglomerates into small nanoparticles under the influence of PVP and CA as capping agents. Loose flower‐like particles are preliminarily obtained as subseeds and thus accelerate the formation of compact 3D Ag NFs via further growth processes . At the same time, numerous Ag NFs are fabricated in the reaction solution.…”

Flexible Random Laser Using Silver Nanoflowers

“…Ag NFs were synthesized using the ice-water bath method [25]. AgNO 3 (Aldrich, Fengxian, Shanghai, China), citric acid (Aladdin, Fengxian, Shanghai, China), PVP (polyvinylpyrrolidone, Aladdin, Fengxian, Shanghai, China), and ascorbic acid (Aldrich, Fengxian, Shanghai, China) were chosen as the oxidant, dispersant, blocking agent, and reductant, respectively.…”

“…Among metal nanostructures, silver nanoflowers (Ag NFs), which provide an abundance of nanogaps and spiky tips, have been widely used in surface-enhanced Raman scattering [22,23,24]. Recently, high-performance random lasing covering visible region was achieved by doping Ag NFs in a dye solution [25]. However, solid-state random lasers using Ag NFs have been rarely reported.…”

Tailoring Whispering Gallery Lasing and Random Lasing in A Compound Cavity

“…Among them, the random lasing was achieved by strong multiple scattering of light in disordered gain media. A particular advantage of the random laser was that they can be produced on small size, cavity-less, and low spatial coherence [10][11][12]. The WGM lasing was achieved via total internal reflection, which resulted in low threshold and narrow linewidth lasers [13][14][15].…”