Two-photon pumped random laser in nanocrystalline ZnO

Chelnokov, E.; Bityurin, N.; Ozerov, Igor; Marine, W.

doi:10.1063/1.2370879

Cited by 76 publications

(57 citation statements)

References 20 publications

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“…11.118 binding energy (59 meV [6]), which allows intense near-band-edge excitonic emission at room temperature (thermal energy ∼26 meV) and beyond that has rekindled the interest in this material. Because of this property, its potential as an UV-blue emitter for lasers and diodes becomes obvious, but also in solar cells, gas and biosensors, and is a newly emerging field of study with enormous potential [7][8][9][10][11][12]. Extensive and excellent reviews on ZnO's properties were recently published by Özgür [10,13], Djurisic [9], Schmidt-Mende [11], and their respective co-workers.…”

Section: Introductionmentioning

confidence: 98%

Aqueous starch as a stabilizer in zinc oxide nanoparticle synthesis via laser ablation

Zamiri

Zakaria

Ahangar

et al. 2012

Journal of Alloys and Compounds

122

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a b s t r a c tZinc oxide is a semiconductor with exceptional thermal, luminescent and electrical properties, even compared with other semiconducting nanoparticles. Its potential for advanced applications in lasers and light emitting diodes, as bio-imaging agent, in biosensors and as drug delivery vehicles, in ointments, coatings and pigments has pulled zinc oxide into the focus of various scientific and engineering research fields. Recently we started investigating if nanoparticle synthesis via laser ablation in the presence of natural stabilizers allows control over size and shape and constitutes a useful, uncomplicated alternative over conventional synthesis methods. In the current paper, we determined the ability of natural starch to act as a size controller and stabilizer in the preparation of zinc oxide nanoparticles via ablation of a ZnO plate in a starch solution with a nanosecond Q-Switched Nd:YAG pulsed laser at its original wavelength ( = 1064 nm). Our results show that the particle diameter decreases with increasing laser irradiation time to a mean nanoparticle size of approximately 15 nm with a narrow size distribution. Furthermore, the obtained particle size in starch solution is considerably smaller compared with analogous ZnO nanoparticle synthesis in distilled water. The synthesized and capped nanoparticles retained their photoluminescent properties, but showed blue emission rather than the often reported green luminescence. Evaluation of old preparations compared with freshly made samples showed no agglomeration or flocculation, which was reflected in no significant change in the ZnO nanoparticle size and size distribution. Overall, our experimental results demonstrate that starch can indeed be effectively used to both control particle size and stabilize ZnO nanoparticles in solution.

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Section: Introductionmentioning

confidence: 98%

Aqueous starch as a stabilizer in zinc oxide nanoparticle synthesis via laser ablation

Zamiri

Zakaria

Ahangar

et al. 2012

Journal of Alloys and Compounds

122

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show abstract

“…The noncentrosymmetry of the wurtzite structural ZnO indicates a good nonlinear optical effect. Multiphoton induced photoluminescence in ZnO micro/nanostructures, 18,19 two-photon pumped random laser, 20 and FP laser 21 in ZnO nanopolycrystals and microtubes have been reported so far. Very recently, Czekalla et al 11 obtained WGM laser with clear regular mode structure and high quality factor from an individual ZnO microwire under the single-photon excitation at low temperature.…”

mentioning

confidence: 98%

Two-photon excited whispering-gallery mode ultraviolet laser from an individual ZnO microneedle

Zhu

et al. 2009

Applied Physics Letters

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Wurtzite structural ZnO microneedles with hexagonal cross section were fabricated by vapor-phase transport method and an individual microneedle was employed as a lasing microcavity. Under excitation of a femtosecond pulse laser with 800 nm wavelength, the ultraviolet (UV) laser emission was obtained, which presented narrow linewidth and high Q value. The UV emission, resonant mechanism, and laser mode characteristics were discussed in detail. The results demonstrated that the UV laser originated from the whispering-gallery mode induced by two-photon absorption assisted by Rabi oscillation.

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“…As the incident photon energy (1.82 eV) is too low to promote an electron from the valence band to the conduction band of ZnO (bandgap of 3.4 eV), the process of excitation which leads to the observation of two luminescence bands involves the simultaneous absorption of two photons [29,30]. Besides this two-photon absorption process through a virtual level, the excitation mechanism can also imply a two-step absorption through a defect level within the bandgap.…”

Section: Discussionmentioning

confidence: 99%

Quantum Size Effect and very localized random laser in ZnO@mesoporous silica nanocomposite following a two-photon absorption process

Bouvy¹,

Chelnokov²,

Marine³

et al. 2009

Journal of Non-Crystalline Solids

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Two-photon pumped random laser in nanocrystalline ZnO

Cited by 76 publications

References 20 publications

Aqueous starch as a stabilizer in zinc oxide nanoparticle synthesis via laser ablation

Aqueous starch as a stabilizer in zinc oxide nanoparticle synthesis via laser ablation

Two-photon excited whispering-gallery mode ultraviolet laser from an individual ZnO microneedle

Quantum Size Effect and very localized random laser in ZnO@mesoporous silica nanocomposite following a two-photon absorption process

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