Optical properties of ZnO nanocrystals embedded in PMMA

Chaieb, A.; Chari, A.; Sahraoui, B.

doi:10.1007/s11082-013-9693-1

Cited by 14 publications

(9 citation statements)

References 32 publications

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“…Very high values of the nonlinear optical tensor components were retrieved, d33=2.975⋅10 -10 m/V=297.5 pm/V and d31= -148.5pm/V, from Maker fringes curves, obtained in transmission mode using a pump beam tuned at 1064 nm (16 ps) [81]. The extremely high values are attributed to quantum confinement mainly due to the low dimensionality of crystallites of ZnO dispersed in PMMA matrix as well as to surface effects.…”

Section: Shg In Zno Nanostructuresmentioning

confidence: 94%

“…In Reference 81 ZnO nanocrystals with very small radius (1.8 nm) and hexagonal wurtzite structure were synthesized and embedded in polymethylmethacrylate (PMMA) starting from a colloidal solution and then by spin coating [81]. The resulting film thickness is 100 nm.…”

Section: Shg In Zno Nanostructuresmentioning

confidence: 99%

“…The optical absorption spectrum of the material at room temperature shows the maximum of the absorption at 4.54 eV. Since the bulk ZnO band gap energy is 3.37 eV, the blue shift of 1.17 eV is ascribed to quantum confinement due to size effect [81]. Luminescence spectrum leads to three bands located at 481.5 nm, 531.09 nm and 671.28 nm.…”

Section: Shg In Zno Nanostructuresmentioning

confidence: 99%

“…The reduced crystallites' size allows quantization of energy levels, enlargement of band gap and the creation of excitons. When excited with field associated to the incident wave, these electron-hole pairs create dipoles [81], contributing to the nonlinear optical signal.…”

Section: Shg In Zno Nanostructuresmentioning

confidence: 99%

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Second harmonic generation from ZnO films and nanostructures

Larciprete¹,

Centini²

2015

Applied Physics Reviews

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Zinc oxide ZnO is a n-type semiconductor having a wide direct band gap (3.37 eV) as well as a\ud non-centrosymmetric crystal structure resulting from hexagonal wurtzite phase. Its wide transparency\ud range along with its second order nonlinear optical properties make it a promising material\ud for efficient second harmonic generation processes and nonlinear optical applications in general. In\ud this review, we present an extensive analysis of second harmonic generation from ZnO films and\ud nanostructures. The literature survey on ZnO films will include some significant features affecting\ud second harmonic generation efficiency, as crystalline structure, film thickness, surface contributes,\ud and doping. In a different section, the most prominent challenges in harmonic generation from ZnO\ud nanostructures are discussed, including ZnO nanowires, nanorods, and nanocrystals, to name a few.\ud Similarly, the most relevant works regarding third harmonic generation from ZnO films and nanostructures\ud are separately addressed. Finally, the conclusion part summarizes the current standing of\ud published values for the nonlinear optical coefficients and for ZnO films and nanostructures,\ud respectively

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Section: Shg In Zno Nanostructuresmentioning

confidence: 94%

Section: Shg In Zno Nanostructuresmentioning

confidence: 99%

Section: Shg In Zno Nanostructuresmentioning

confidence: 99%

Section: Shg In Zno Nanostructuresmentioning

confidence: 99%

See 2 more Smart Citations

Second harmonic generation from ZnO films and nanostructures

Larciprete¹,

Centini²

2015

Applied Physics Reviews

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“…ZnO nanoparticles or quantum dots have been incorporated inside polymers for many years. Their optical properties have been combined to develop new applications, like nonlinear optics [10], photovoltaic applications [11,12], and UV-Vis absorbers [13]. ZnO could be combined with a transparent matrix to form suitable UV-shielding materials, filters, and luminescent films.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional UV and Gas Sensors Based on Vertically Nanostructured Zinc Oxide: Volume Versus Surface Effect

Ocola

Wang

Divan

et al. 2019

Sensors

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This article reports that it is possible to make multifunctional sensing devices with ZnO infiltrated polymers while the sensing interactions could occur throughout the polymer. As such, we find that infiltrated devices with SU-8 polymer can result in highly sensitive UV sensors. Mesh dielectric core devices were found to make sensitive gas sensors with a better than 5 ppm sensitivity for formaldehyde and NO2. A new type of p-n junction device is further demonstrated that is sensitive to UV illumination, thus making it an enhanced UV sensor. Sensing devices relying on volume interactions, such as light absorption, can significantly benefit from the infiltrated polymer. In contrast, devices that rely on surface interactions, such as gas sensors, do not gain performance in any significant way with or without the infiltrated polymer.

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