Optical SHG for ZnO films with different morphology stimulated by UV-laser thermotreatment

Ebothé, J.; Miedzinski, R.; Kapustianyk, V.; Turko, B.; Kulyk, B.; Gruhn, W.; Kityk, I.V.

doi:10.1088/1742-6596/79/1/012001

Cited by 21 publications

(15 citation statements)

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“…In the form of thin film, ZnO is a very promising alternative in flat display screens (Ghosh and Basu 1991) compared to tin-doped indium oxides (ITOs) which is a limited natural resource. When it is doped, ZnO film presents promising second-order nonlinear optical properties, which achieve the giant nonlinear optical effects about 50 pm/V (Ebothe et al 2007). Many methods have been employed to prepare ZnO thin films like spray pyrolysis (Benny et al 1999), molecular beam epitaxy (Feng et al 2006), chemical vapor deposition (Funakubo et al 1999), RF magnetron sputtering (Lai and Lee 2008) and sol-gel (Hwangbo et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Structural, optical and electrical properties of ZnO:Al thin films for optoelectronic applications

et al. 2013

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Undoped and aluminum-doped ZnO thin films are prepared by the sol-gel spincoating process. Zinc acetate dihydrate, ethanol and mono-ethanolamine are used as precursor, solvent and stabilizer, respectively. The atomic percentage of dopant in solution were [Al/Zn] = 1 %, 2 % and 3 %. The effect of Al doping on the optical and electrical properties of ZnO films was investigated by X-ray diffraction (XRD), Four-Point probe technique and UV-visible spectrophotometery. The results from the X-ray diffraction show that the pure ZnO thin films had a polycrystalline structure of the hexagonal Wurtzite Type. A minimum resistivity of 3.3 × 10 −3 · cm was obtained for the film doped with 2 mol % Al. Optical transmissions reveal a good transmittance within the visible wavelength spectrum region for all of the films. The value of the band gap is enhanced from 3.21 eV (undoped ZnO) to 3.273 eV (Al/Zn = 3 %), the increase in the band gap can be explained by the Burstein-Moss effect.

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Section: Introductionmentioning

confidence: 99%

Structural, optical and electrical properties of ZnO:Al thin films for optoelectronic applications

et al. 2013

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“…The parameters of the task are chosen according to the conditions of existing experiments for the given ZnO structure [1,4,[14][15][16]. As a fundamental beam, there are considered the output beam of a Q-switched Nd doped yttrium aluminum garnet laser generating at  = 1,064 nm with 16 ps pulse duration and 10 Hz repetition rate.…”

Section: Resultsmentioning

confidence: 99%

“…As is known, in this compound the crystal ZnO responsible for nonlinear properties of a structure and PMMA plays the role of matrix. Authors of this work use nonlinear interaction in ZnO, which is connected to relevant second order susceptibility (up to 10 pm/V) and which strongly depend on degree of the crystallinity of the film and the grain boundaries [1]. In the process of doubling, the generation of radiation takes place on a wavelength of the order of 0.532 mcm.…”

Section: Resultsmentioning

confidence: 99%

“…It should be noted that the technology of the bulk crystal synthesis is relatively expansive since it requires highly developed technology for crystal growth methods and long processing time. Exploration of semiconductors and dielectrics by harmonic generation method yields information on morphology and structure of these compounds [1].…”

mentioning

confidence: 99%

“…The first reason is relevant second order susceptibility (up to 10 pm/V) [2]. Furthermore these crystals have excellent optical and photomechanical properties [1], and ability to deposit the layers on different kinds of substrates [3]. A series of works for instance Refs.…”

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Phase Effects at Second-Harmonic Generation in ZnO/PMMA Nanocomposite Films

Kasumova¹,

Mamedov²,

Shamilova³

2017

JPSA

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Abstract:In this paper analysis of constant-intensity approximation of nonlinear interaction of the second-harmonic generation in ZnO/PMMA nanocomposite films for different concentrations of ZnO was carried out with regard to the losses and phase changes of all the interacting waves. The investigated samples were manufactured on the basis of ZnO nanoparticles embedded into polyvinylchloride polymeric matrix (PMMA) by the method of electrochemical deposition. The main goal of work is the exploration of the ZnO morphology and parameters of the second order susceptibilities. It is verified that the surface effects in ZnO/PMMA structures will give a larger contribution than the volume effects. The factors restricting the efficiency of the process of frequency conversion have been analyzed.

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Second‐Harmonic Generation from ZnO/Al₂O₃ Nanolaminate Optical Metamaterials Grown by Atomic‐Layer Deposition

Wickberg

Kieninger

Sürgers

et al. 2016

Advanced Optical Materials

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CommuniCationeven larger than for bulk ZnO crystals. [4][5][6][7][8][9][10][11][12][13][14] These publications have also highlighted some of the important links between the structural properties of the thin films and their nonlinear optical susceptibility. In the work by Cao et al., thin films of ZnO were fabricated on sapphire substrates by pulsed laser ablation. [5] The second-order susceptibility was determined to be 13.40 pm V (2) 1. Furthermore, it was shown that the second-order susceptibility decreases with increasing crystalline quality and with increasing film thickness. This finding was attributed to a strong contribution of grain boundaries and interfaces to the second-order susceptibility. Another group highlighted the strong dependence of the structural and second-order nonlinear properties on the deposition conditions and the choice of the substrate. [4] Clearly, different deposition techniques lead to different growth behavior, hence different structural properties and thus different nonlinear optical properties. Atomic-layer deposition (ALD) is a fabrication technique that is particularly well-suited for the needs of optical integration. ALD is CMOS-compatible and allows for an inexpensive and conformal deposition on a large variety of substrates with a precision down to a monolayer. [15] Unfortunately, ZnO crystallites grown by ALD seem to have properties unfavorable for a strong second-order nonlinear response as there is not a single publication covering this topic. As we will show in this publication, the weak second-order response can be ascribed to the random orientation of the ZnO crystallites in pure ALD-grown ZnO thin films. In general, there are only few publications showing the realization of ALD-grown second-order nonlinear thin films and these are solely based on the idea of a strong interface-connected response. [16,17] In this Communication, we use the concept of nanolaminates to tune the second-order nonlinear properties as it has previously been demonstrated for the mechanical, linear optical, and also the third-order nonlinear optical properties of ALD-grown thin films. [18][19][20] Using this approach, we are able to control the ZnO crystallite growth and thus, for the first time, achieve a strong bulk second-order nonlinear susceptibility in ALD-grown thin films.The literature on ZnO thin films suggests that two key factors have to be controlled to maximize the second-order susceptibility in ALD-grown ZnO films. The first key factor is a well-defined ZnO crystallite orientation to avoid mutual cancellation of the contributions of neighboring misaligned crystallites. Without a preferential direction within a plane parallel to the substrate, the substrate normal is the only extraordinary direction. Indeed, ZnO films with a strong nonlinear

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Optical SHG for ZnO films with different morphology stimulated by UV-laser thermotreatment

Cited by 21 publications

References 20 publications

Structural, optical and electrical properties of ZnO:Al thin films for optoelectronic applications

Structural, optical and electrical properties of ZnO:Al thin films for optoelectronic applications

Phase Effects at Second-Harmonic Generation in ZnO/PMMA Nanocomposite Films

Second‐Harmonic Generation from ZnO/Al₂O₃ Nanolaminate Optical Metamaterials Grown by Atomic‐Layer Deposition

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Optical SHG for ZnO films with different morphology stimulated by UV-laser thermotreatment

Cited by 21 publications

References 20 publications

Structural, optical and electrical properties of ZnO:Al thin films for optoelectronic applications

Structural, optical and electrical properties of ZnO:Al thin films for optoelectronic applications

Phase Effects at Second-Harmonic Generation in ZnO/PMMA Nanocomposite Films

Second‐Harmonic Generation from ZnO/Al2O3 Nanolaminate Optical Metamaterials Grown by Atomic‐Layer Deposition

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Second‐Harmonic Generation from ZnO/Al₂O₃ Nanolaminate Optical Metamaterials Grown by Atomic‐Layer Deposition