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Study of Second Harmonic Generation in KDP/Al₂O₃ Crystalline Nanocomposite

100%

Andrushchak N., Kulyk B., Göring P., Andrushchak A., Sahraoui B.

Acta Physica Polonica A

2018

vol. 133

issue 4

856-859

Crystalline nanocomposite KDP/Al₂O₃ was obtained by growth of KDP nanocrystals inside nanopores of amorphous alumina matrix (Al₂O₃) with pores diameter of 35 nm. Performed atomic force microscopy and X-ray diffraction analysis confirmed that Al₂O₃ matrix is filled up with a tetragonal phase KDP nanocrystals in preferred crystallographic orientation [100]. The nonlinear optical response was studied by means of second harmonic generation via the Maker fringe technique employing picosecond laser pulses at wavelength of 1064 nm. The polarization dependent second harmonic generation response was observed mainly due to the macroscopic crystalline structure anisotropy of KDP/Al₂O₃ nanocomposite. The investigation of such type of nanocomposites which combine nanoscale nonlinear optical materials has a great importance since they may improve the performance of entire system.

Radiation Effects in DMAAS:Cr Ferroelectric Crystal

86%

Kapustianik V., Czapla Z., Eliyachevskyy Y., Korchak Y., Kulyk B., Rudyk V.

Acta Physica Polonica A

2003

vol. 104

issue 6

571-580

This paper presents the results of investigations of the radiation effects in NH_2(CH_3)_2Al(SO_4)_2×6H_2O crystals doped with chromium. On the basis of absorption spectroscopy and resonance Raman scattering study it has been shown that comparatively low doses of radiation first of all causes recharging of Cr^{3+} on Cr^{4+} ions. Besides, the processes of dehydrogenation and the changes in arrangement of the hydrogen bond network were observed. These changes are followed by distortion of the complexes bonded by such a type of bonds.

Structural Properties and Temperature Behaviour οf Optical Absorption Edge in Polycrystalline ZnO:X (Cu,Ag) Films

86%

Kulyk B., Figà V., Kapustianyk V., Panasyuk M., Serkiz R., Demchenko P.

Acta Physica Polonica A

2013

vol. 123

issue 1

92-97

Silver- and copper-doped ZnO films were prepared by radio-frequency magnetron sputtering on glass substrates. The influence of dopants content on the structural, morphological properties as well as on evolution of the optical absorption edge was considered. It has been found that Ag- and Cu-doped ZnO films are characterized by wurtzite crystalline structure with the preferred direction of crystalline orientation (002). The sizes of grains within the films were found to be dependent on the type of dopant. The temperature evolution of the optical absorption edge is described by the modified Urbach rule that reflects polycrystalline nature of the material. The corresponding parameters concerning electron- (exciton-) phonon interaction, phonon energies and temperature changes of the band-gap were determined and analysed.

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3 Acta Physica Polonica A

1 2018

1 2013

1 2003

3 Kulyk B.

1 Andrushchak A.

1 Andrushchak N.

1 Czapla Z.

1 Demchenko P.

1 Eliyachevskyy Y.

1 Figà V.

1 Göring P.

1 Kapustianik V.

1 Kapustianyk V.

1 Korchak Y.

1 Panasyuk M.

1 Rudyk V.

1 Sahraoui B.

1 Serkiz R.

Search results

Study of Second Harmonic Generation in KDP/Al₂O₃ Crystalline Nanocomposite

Radiation Effects in DMAAS:Cr Ferroelectric Crystal

Structural Properties and Temperature Behaviour οf Optical Absorption Edge in Polycrystalline ZnO:X (Cu,Ag) Films