2011
DOI: 10.1364/oe.19.002996
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Colloidal quantum dot random laser

Abstract: We report random laser action in a system where optical amplification is provided by colloidal quantum dots (CQDs). This system is obtained by depositing from solution CdSe/ZnS core-shell CQDs into rough micron-scale grooves fabricated on the surface of a glass substrate. The combination of CQD random packing and of disordered structures in the glass groove enables gain and multiple scattering. Upon optical excitation, random laser action is triggered in the system above a 25-mJ/cm2 threshold. Single-shot spec… Show more

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Cited by 132 publications
(82 citation statements)
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“…As fluence increases, a larger fraction of the excited volume reaches the regime of optical gain, in turn increasing and reducing, respectively, stimulated and spontaneous emission. The saturation of the 1S excitonic level could also play a role in the reduction of the slope of detected PL and a similar behavior was previously seen in films of CdSe/ZnS CQDs [34]. The amplified component fully dominates at the higher fluence regime when all spontaneously emitted photons that are guided in the CQD layer are amplified significantly by stimulated emission.…”
Section: Experimental Methodssupporting
confidence: 71%
“…As fluence increases, a larger fraction of the excited volume reaches the regime of optical gain, in turn increasing and reducing, respectively, stimulated and spontaneous emission. The saturation of the 1S excitonic level could also play a role in the reduction of the slope of detected PL and a similar behavior was previously seen in films of CdSe/ZnS CQDs [34]. The amplified component fully dominates at the higher fluence regime when all spontaneously emitted photons that are guided in the CQD layer are amplified significantly by stimulated emission.…”
Section: Experimental Methodssupporting
confidence: 71%
“…39-41, 45, 47, 53 Quantum dot based random lasing has already been observed in CdSe/ZnS core-shell CQDs, by depositing them on glass substrates with roughened grooves. 54 In this case the rough surfaces of the grooves are considered to be important for enabling laser feedback, and a threshold fluence of 25 mJ/cm 2 is reported.…”
Section: Introductionmentioning
confidence: 97%
“…In this work, we present a systematic and thorough investigation of CQD-based random lasing, while the earlier report 54 only provides principle evidence that random lasing in CQDs is feasible. Our samples are uniform films of CdSe/CdS CQDs on planar glass substrates.…”
Section: Introductionmentioning
confidence: 99%
“…light emitters, optical multiplexers, biosensors, spectral tuners, quantum computing, logic gates, among others [1][2][3][4][5][6]. Nowadays, it has been possible to combine nanostructures with other polymeric materials such as optical fibers, giving rise to nanocomposites, which are generally composed of several phases such as SiO2, where one or several of its dimensions are found at the nanoscale [6][7][8][9][10]. The optical fibers are a important elements for the propagation of light waves with water and for the propagation of electromagnetic waves in the optical, infrared and ultraviolet range, however, there are other important applications for optical fibers in the area of sensors and in the study of nonlinear optical phenomena.…”
Section: Introductionmentioning
confidence: 99%