Articole din publicaţii internaţionale: Recent submissions

  • Wavelength modulated optical reflectivity spectra of CuAl1 -XGaXSe2crystals 
    SYRBU, N. N.; DOROGAN, A. V.; URSAKI, V. V.; MASNIK, A. (IOP Publishing, 2010)
    Exciton spectra of CuAl1 − XGaXSe2 solid solutions are investigated by wavelength modulated optical reflectivity at low temperatures (10 K). The energy position of n = 1 and 2 lines of the Γ4(A), Γ5(B) and Γ5(C) exciton ...
  • Birefringence of CuGaxAl1-xSe2 crystals 
    SYRBU, N. N.; DOROGAN, A. V.; MASNIK, A.; URSAKI, V. V. (IOP Publishing, 2011)
    Excitonic reflection spectra of CuAlSe2 crystals were studied at 10 K. The spectral dependences of refractive indices no and ne were calculated. The isotropic wavelength (the point of intersection of no and ne) in the ...
  • Raman scattering investigation of MnxFe1−xIn2S4 solid solutions 
    GUC, M.; URSAKI, V. V.; BODNAR, I. V.; LOZHKIN, D. V.; ARUSHANOV, E.; IZQUIERDO-ROCA, V.; PÉREZ RODRÍGUEZ, A. (ELSEVIER, 2012)
    Spinel-type MnxFe1−xIn2S4 solid solutions grown by the planar melt crystallization method (the horizontal version of the Bridgman method) are investigated by means of energy dispersive X-ray analysis and Raman scattering ...
  • Birefringence and excitonic spectra of TlGaS2 crystals 
    STAMOV, I. G.; SYRBU, N. N.; URSAKI, V. V.; ZALAMAI, V. V. (ELSEVIER, 1999)
    The anisotropy of transmission spectra was investigated in TlGaS2 crystals. An intensive transmission line was found in samples placed between two crossed polarizers. Ground and excited states of excitons were detected in ...
  • Luminescence and electrophysical characteristics of ZnSe implanted with acceptor impurities 
    GEORGOBIANI, A. N.; AMINOV, U. A.; DRAVIN, V. A.; LEPNEV, L. S.; MULLABAEV, I. D.; URSAKI, V. V.; ILJUKHINA, Z. P. (ELSEVIER, 1999)
    The investigation of traps and recombination centres in structures based on ZnSe single crystals by means of the deep level transient spectroscopy, photoluminescence and electroluminescence methods are presented. The ...
  • Random lasing in nanostructured ZnO produced from bulk ZnSe 
    URSAKI, V. V.; ZALAMAI, V. V.; BURLACU, A.; KLINGSHIRN, C.; MONAICO, E.; TIGINYANU, I. M. (IOP Publishing, 2009)
    We propose to produce three-dimensional ZnO random laser media on the basis of bulk ZnSe. Bulk ZnSe wafers are transformed into granular ZnO media by thermal treatment in oxygen ambient at temperatures in the range of ...
  • Birefringence of CuGa2S4 crystals 
    SYRBU, N.; DOROGAN, A.; URSAKI, V.; STAMOV, I.; TIGINYANU, I. M. (The Electrochemical Society, 2011)
    Investigation of the spectral characteristics as a function of the crystal thickness demonstrates that one can create filters using thin crystals for selecting several spectral lines. The wavelength of these lines is ...
  • The influence of isochronous annealing upon the near-band-edge photoluminescence spectra of the electron-irradiated n-InP 
    RADAUTSAN, S. I.; TIGINYANU, I. M.; URSAKI, V. V.; KORSHUNOV, F. P.; SOBOLEV, N. A.; KUDRYAVTSEVA, E. A. (ELSEVIER, 1993)
    The near-band-edge photoluminescence (PL) bands observed at 1.305 and 1.392 eV (T = 4.2 K) in electron-irradiated InP single crystals and epilayers have different behaviour with increasing temperature of isochronous ...
  • Guided mode lasing in ZnO nanorod structures 
    URSAKI, V. V.; ZALAMAI, V. V.; BURLACU, A.; FALLERT, J.; KLINGSHIRN, C.; KALT, H.; EMELCHENKO, G. A.; REDKIN, A. N.; GRUZINTSEV, A. N.; RUSU, E. V.; TIGINYANU, I. M. (ELSEVIER, 2009)
    Quasi-two-dimensional arrays of nearly parallel hexagonal ZnO nanorods and a three-dimensional cylindrical microstructure consisting of ZnO nanorods have been grown by low pressure chemical vapor deposition (CVD) and ...
  • Raman-active modes of porous gallium phosphide at high pressures and low temperatures 
    URSAKI, V. V.; MANJÓN, F. J.; SYASSEN, K.; TIGINYANU, I. M.; IRMER, G.; MONECKE, J. (IOP Publishing, 2002)
    Porous gallium phosphide (GaP) with a honeycomb-like morphology and a skeleton relative volume concentration c = 0.7 was investigated by Raman spectroscopy under pressure up to 10 GPa at T = 5 K. The porous samples were ...
  • Optical characterization of AlN/GaN heterostructures 
    URSAKI, V. V.; TIGINYANU, I. M.; ZALAMAI, V. V.; HUBBARD, S. M.; PAVLIDIS, D. (American Institute of Physics, 2003)
    AlN/GaN/sapphire heterostructures with AlN gate film thickness of 3–35 nm are characterized using photoreflectivity (PR) and photoluminescence (PL) spectroscopy. Under a critical AlN film thickness, the luminescence from ...
  • Impact of size upon lasing in ZnO microtetrapods 
    ZALAMAI, V. V.; URSAKI, V. V.; TIGINYANU, I. M.; BURLACU, A.; RUSU, E. V.; KLINGSHIRN, C.; FALLERT, J.; SARTOR, J.; KALT, H. (Springer Nature Switzerland, 2010)
    High optical quality, well end leg faceted ZnO microtetrapods with leg length between 1 and 12 μm have been grown by carbothermal chemical vapor deposition. Lasing with mode quality factors of 2500–3000 is demonstrated. ...
  • Pressure Induced Phase Transitions in Spinel and Wurtzite Phases of ZnAl2S4Compound 
    URSAKI, Veacheslav V.; BURLAKOV, Igor I.; TIGINYANU, Ivan M.; RAPTIS, Yannis S.; ANASTASSAKIS, Evangelos; AKSENOV, Igor; SATO, Katsuaki (IOP Publishing, 1998)
    ZnAl2S4 single crystals with spinel (α-phase) and wurtzite (w-phase) structures have been studied by Raman spectroscopy under hydrostatic pressures of up to 300 kbar. Significant changes in the phonon spectrum of the α-phase ...
  • Spatial dispersion in polariton spectra of CuGaS2 crystals 
    SYRBU, N. N.; BLAJE, M.; TEZLEVAN, V. E.; URSAKI, V. V. (Springer Nature Switzerland, 2002)
    TIn this study, we obtained new data on the parameters of the long-wavelength exciton polaritons of the A series and studied the wavelength-modulated reflectivity spectra of the A, B, and C excitons, the luminescence ...
  • Artificial birefringence introduced by porosity in GaP 
    URSAKI, V. V.; SYRBU, N. N.; ALBU, S.; ZALAMAI, V. V.; TIGINYANU, I. M.; BOYD, Robert W. (IOP Publishing, 2005)
    Porosity-induced birefringence in a GaP membrane is studied using a method based on the analysis of beats in unpolarized and polarized transmittance spectra as well as in angular dependence of optical spectra. Birefringence ...
  • Variable-range hopping conductivity in Cu2ZnGeSe4 single crystals 
    GUC, M.; LISUNOV, K. G.; HAJDEU, E.; LEVCENKO, S.; URSAKI, V.; ARUSHANOV, E. (ELSEVIER, 2014)
    Resistivity, ρ(T), of the Cu2ZnGeSe4 single crystals is investigated between T~10 and 300K. The Mott variable-range hopping (VRH) conductivity is observed in the temperature interval of ~80–230K. Analysis of the Mott VRH ...
  • Excitation and temperature tuned photoluminescence in HgGa2S4 single crystals 
    URSAKI, V. V.; RICCI, P. C.; TIGINYANU, I. M.; ANEDDA, A.; SYRBU, N. N.; TEZLEVAN, V. E. (ELSEVIER, 2002)
    Mercury thiogallate single crystals are shown to exhibit bright photoluminescence (PL) tunable in a wide spectral range from green to red when changing the excitation power density, wavelength and sample temperature. Taking ...
  • The interference of additional waves of forbidden polaritons excited by allowed polaritons in CuGaS2 
    SYRBU, N. N.; URSAKI, V. V.; TIGINYANU, I. M.; TEZLEVAN, V. E.; BLAJE, M. A. (ELSEVIER, 2003)
    Additional waves of exciton polaritons are studied in thin (1.5–1.8 μm) CuGaS2 crystals at 9 K. The reflectivity spectra show a fine structure related to the interference of Fabry–Perot and additional waves which is a ...
  • A comparative study of guided modes and random lasing in ZnO nanorod structures 
    URSAKI, V. V.; ZALAMAI, V. V.; BURLACU, A.; FALLERT, J.; KLINGSHIRN, C.; KALT, H.; EMELCHENKO, G. A.; REDKIN, A. N.; GRUZINTSEV, A. N.; RUSU, E. V.; TIGINYANU, I. M. (IOP Publishing, 2009)
    Hexagonal and arrow-headed ZnO nanorod structures have been grown by low pressure chemical vapour deposition (CVD) and atmospheric pressure metal-organic CVD. The technology ensures a high optical quality of the produced ...
  • Luminescence properties of ZnGa2O4 and ZnAl2O4 spinels doped with Eu3+ and Tb3+ ions 
    RUSU, E.; URSAKI, V.; NOVITSCHI, G.; VASILE, M.; PETRENCO, P.; KULYUK, L. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2009)
    Spinel-type ZnGa2O4 and ZnAl2O4 powders doped with Eu3+ and Tb3+ ions, including dual doping, have been prepared by solid phase reactions and by deposition from chemical solutions. XRD analysis demonstrates the high quality ...

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