• Electronic and optical properties of doped Cu2O and ZnS thin films 

      Polyakov, Stanislav (Doctoral theses at NTNU;2017:107, Doctoral thesis, 2017)
      In this thesis, two earth-abundant, easily fabricated semiconductors, Cu2O and ZnS, were investigated to explore their electronic and optical properties after doping. Fe doped ZnS has been studied as a potential material ...
    • MBE-grown Cr:ZnS Thin Film Laser Media 

      Tolstik, Nikolai; Sorokin, Evgeni; Karhu, Eric Andrew; Polyakov, Stanislav; Gibson, Ursula; Sorokina, Irina T (Chapter, 2016)
      We report results of spectroscopic analysis of the first first laser-quality MBE-grown Cr:ZnS films. Comparison of spectral-luminescent properties with bulk Cr:ZnS indicates their good laser properties, opening the way ...
    • Nonlinear optical response and structural properties of MBE-grown Fe:ZnS films 

      Polyakov, Stanislav; Karhu, Eric Andrew; Zamiri, Reza; Moisset, Charles; Iliopoulos, Konstantinos; Vullum, Per Erik; Österberg, Ulf; Gibson, Ursula (Journal article; Peer reviewed, 2018)
      Fe-doped ZnS films of high optical quality were fabricated using vacuum vapor deposition. Preferential crystalline orientation and phase purity of the host ZnS films were increased by the addition of small amounts of Fe, ...
    • Spectral-luminescent properties of vapor deposited Cr:ZnS thin films and their application as saturable absorbers for 1.5-μm erbium lasers 

      Tolstik, Nikolai; Sorokin, Evgeni; Karhu, Eric Andrew; Gorbachenya, Konstantin N.; Polyakov, Stanislav; Kisel, Victor E.; Kuleshov, Nikolai V.; Furtula, Vedran; Gibson, Ursula; Sorokina, Irina T (Journal article; Peer reviewed, 2018)
      We report the results of the extensive spectral-luminescent characterization including concentration quenching analysis of the first laser-quality vapor-deposited Cr:ZnS films, and demonstrate their use as saturable ...
    • Towards Mid-IR Waveguide Lasers: Transition Metal Doped ZnS Thin Films 

      Karhu, Eric Andrew; Tolstik, Nikolai; Sorokin, Evgeni; Polyakov, Stanislav; Zamiri, Reza; Furtula, Vedran; Østerberg, Ulf Lennart; Sorokina, Irina T; Gibson, Ursula (Chapter; Peer reviewed, 2016)
      Thin films of Cr and Fe-doped ZnS suitable for waveguide mid-IR applications, with well-isolated TM2+ peaks, and Cr2+ absorption and fluorescence comparable to bulk crystals were investigated. Raman data indicate that the ...