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Random laser in dye-doped electrospun nanofibers: Study of laser mode dynamics via temporal mapping of emission spectra using Pearson's correlation
摘要： The development of optically active flexible nanostructures has been pursued in the last years owing to their potential application in photonic devices. Herein, we report a random laser architecture based on a flexible Rhodamine B-doped PMMA nanofibers produced via electrospinning technique with 1% and 5% (w/w) of dye. The lower concentrated sample provided only incoherent emission due to the low absorption mean free path. The most concentrated one provided both coherent and incoherent random laser emission depending on the position of the sample the excitation took place. Pearson’s correlation coefficient maps showed a clear correspondence with the already established mode locking transition in random laser. A temporal mapping of successive emission spectra was performed, which provided qualitative information about mode competition dynamic when applied to coherent emission spectra and a highly sensitive way of tracking line widening and red/blueshift in incoherent random laser emission spectra. The developed system can be further employed to design novel miniaturized chemical and temperature sensors.
关键词： Electrospun nanofibers,Random laser,Mode correlation,Temporal dynamics
更新于2025-09-19 17:13:59
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Random Laser Action from Electrospun Polymeric Nanofibers Doped Either with Organic Dye or Semiconductor Nanoprisms
摘要： The search for light sources with targeted characteristics motivates the work of a large part of the photonics community. One topical subject in this area is the study of Random Lasers (RLs), which use as feedback mechanism the light scattering in a random medium instead of a Fabry-Perot cavity. A large variety of RLs and a diversity of applications have already been demonstrated. Of interest in many applications are RLs based on flexible hosts, which act not only as mechanical support, but also as scattering agent. Such host can be obtained, for example, by electrospinning fibers made by environment-friendly materials. In this work, we report on a technique to produce a system composed by electrospun acetate ester of cellulose nanofibers (AEC-NFs) containing poly(ethylene oxide) – PEO (10% or 20% wt. - known to improve the mechanical properties of AEC-NFs), which presence originates a double-peaked diameter distribution centred around 120 nm and 600 nm. RL experiments were made with either Rhodamine 6G (Rh6G, 2 mM) or 40% wt. ZnO nanoprisms (NPs), that act as gain media. By varying the PEO amount in the AEC-NFs we investigate how the structures with smaller diameters act as scatterers for obtaining RL emission. Raman spectroscopy was performed in order to assure that PEO has been incorporated to the AEC-NFs in the desired amount.
关键词： poly(ethylene oxide),Rhodamine 6G,Random Lasers,ZnO nanoprisms,electrospun nanofibers
更新于2025-09-11 14:15:04
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Rapid Fabrication of Photoluminescent Electrospun Nanofibers without the Need of Chemical Polymeric Backbone Modifications
摘要： Photoluminescent electrospun nano?bers were fabricated by incorporating a cyclopentadiene derivative AIE-active luminogen within the polymeric matrices of polyvinylpyrrolidone (PVP), poly(vinylidene ?uoride)-co-hexa?uoropropylene (PVDF-HFP), and poly(methylacrylate) (PMMA) under di?erent solvents. Raman, infrared, and ?uorescence spectroscopy showed the molecular integrity of the AIEgen is maintained during the electrospinning process while exhibiting a strong and uniformed phosphorescent radiative pathway of τ average = 8.9 μs. This method allows for the rapid fabrication of photoluminescent nano?bers into a wide range of polymeric matrices without the need of chemical modi?cations. Taken together, the prepared electrospun phosphorescent nano?bers are a stepping stone for AIEgens to be applied in the digital manufacturing and design of smart textiles.
关键词： smart textiles,photoluminescent,AIE-active luminogen,electrospun nanofibers,polymeric matrices
更新于2025-09-10 09:29:36