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Semiconductor and Material Spectroscopy Laboratory
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Publications

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Structural and magnetic properties of Gd-doped ZnO
Year: 2014
Authors: Ioannis Bantounas, Venkatesh Singaravelu, Iman Salem Roqan, Udo Schwingenschloegl
  • Gd doped ZnO
  • Density Functional Theory
Vacancy complexes induce long-range ferromagnetism in GaN
Year: 2014
Authors: Zhenkui Zhang, Udo Schwingenschloegl, Iman Salem Roqan
  • Vacancies
  • III-V semiconductors
  • Ferromagnetism
  • Density functional
  • Antiferromagnetism
Possible mechanism for d0 ferromagnetism mediated by intrinsic defects
Year: 2014
Authors: Zhenkui Zhang, Udo Schwingenschloegl, Iman Salem Roqan
  • Zn vacancies
  • ZnS Nanostructures
  • Intrinsic Defects
  • Density Functional Theory
Excitonic localization in AlN-rich AlxGa1−xN/AlyGa1−yN multi-quantum-well grain boundaries
Year: 2014 ISSN:0003-6951
Authors: Idris A. Ajia, P. R. Edwards, Z. Liu, J.C. Yan, R.W. Martin, Iman Salem Roqan
  • Multiple Quantum Wells
  • Grain boundaries
  • Photoluminescence
  • Excitons
High optical and structural quality of GaN epilayers grown on
Year: 2014
Authors: Mufasila Mumthaz Muhammed, M. Peres, Y. Yamashita, Y. Morishima, S. Sato, N. Franco, K. Lorenz, A. Kuramata, Iman Salem Roqan
  • III-V semiconductors
  • Epitaxy
  • X-Ray Diffraction
  • Photoluminescence
Neocellularization and neovascularization of nanosized bioactive glass-coated decellularized trabecular bone scaffolds
Year: 2013
Authors: L-C. Gerhardt, K. L. Widdows, M. M. Erol, A. Nandakumar, Iman Salem Roqan, T. Ansari, A. R. Boccaccini
  • Decellularized Bone
  • Scaffold
  • Bioactive glass
  • Angiogenesis
  • Coating
  • Vascular endothelial growth factor
  • Stereology
  • Vascularisation
Hydrocarbon analysis using desorption atmospheric pressure chemical ionization
Year: 2013
Authors: Fred P.M. Jjunju, Abraham K. Badu-Tawiah, Anyin Li, Santosh Soparawalla, Iman Salem Roqan, R. Graham Cooks
  • Ambient Ionization Mass Spectrometry
  • Petroleum Constituents
  • Charge Exchange
  • Ion-Molecule reactions
  • Polynuclear Aromatics
  • Fuels
In situ analysis of corrosion inhibitors using a portable mass spectrometer with paper spray ionization
Year: 2013
Authors: Fred P.M. Jjunju, Anyin Li, Abraham K. Badu-Tawiah, Pu Wei, Linfan Li, Zheng Ouyang, Iman Salem Roqan, R. Graham Cooks
  • Mass Spectrometer
  • Corrosion Inhibitor
Sequential multiple-step europiumion implantation and annealing of GaN
Year: 2013
Authors: S. M. C. Miranda, P. R. Edwards, K.P. O’Donnell, M. Bockowski, E. Alves, Iman Salem Roqan, A. Vantomme, K. Lorenz
  • Gallium Nitride
  • Ion Implantation
  • Crystal Quality
  • Europium
High pressure annealing of Europium implanted GaN
Year: 2012
Authors: K. Lorenz, S. M. C. Miranda, E. Alves, Iman Salem Roqan, K.P. O’Donnell, M. Bockowski
  • GaN
  • Rare Earth Doping
  • Europium
  • Ion Implantation
  • Rutherford Backscattering Spectrometry
  • X-ray
Lineshape Engineering in an All-Pass Ring Resonator with Backreflection Coupled to a Symmetrical Fabry–Perot Resonator
Year: 2012
Authors: Vasily A. Melnikov, Iman Salem Roqan
  • Coupled-mode theory (CMT)
  • Transfer functions
  • Resonator
The photoluminescence/excitation (PL/E) spectroscopy of Eu-implanted GaN
Year: 2011
Authors: K.P. O’Donnell, Iman Salem Roqan, K. Wang, K. Lorenz, E. Alves, M. Bockowski
  • Gallium Nitride
  • Europium
  • Ion Implantation
  • Photoluminescence
  • Excitation Mechanism
The pro-angiogenic properties of multi-functional bioactive glass composite scaffolds
Year: 2011
Authors: L-C. Gerhardt, K. L. Widdows, M. M. Erol, C. W. Burch, José, A. Sanz- Herrera, I. Ochoa, R. Stämpfli, Iman Salem Roqan, S. Gabe, T. Ansari, A. R. Boccaccini
  • Angiogenesis
  • Bioactive glass
  • Composite scaffold
  • Vascular endothelial growth factor
  • Bone
  • Vascularisation
Ab initio investigation on the magnetic ordering in Gd doped ZnO
Year: 2011
Authors: Ioannis Bantounas, Souraya Goumri-Said, Mohammed Benali Kanoun, Aure´lien Manchon, Iman Salem Roqan, Udo Schwingenschloegl
  • Ferromagnetism
  • Magnetic semiconductors
Lattice site location of optical centers in GaN:Eu light emitting diode material grown by organometallic vapor phase epitaxy
Year: 2010
Authors: K. Lorenz, E. Alves, Iman Salem Roqan, K.P. O’Donnell, A. Nishikawa, Y. Fujiwara, M. Bockowski
  • Photoluminescence
  • Doping
  • Light emitting diodes
  • III-V semiconductors
Identification of the prime optical center in GaN:Eu3+
Year: 2010 ISSN:10
Authors: Jjunju, Fred.P.M., Abraham.K.Badu-Tawiah, Anyin Li, And R. Graham Cooks, Iman S Roqan
  • Optics
  • GaN
  • Eu3+
  • Physics
Eu Doping of Zincblende GaN by Ion Implantation
Year: 2009
Authors: K. Lorenz, Iman Salem Roqan, N. Franco, K.P. O’Donnell, V. Darakchieva, E. Alves, C. Trager-Cowan, R.W. Martin, D.J. As, M. Panfilova
  • III-V semiconductors
  • Rutherford backscattering
  • X-Ray Diffraction
  • Cathodoluminescence
  • Europium
  • gallium compounds
  • Ion Implantation
  • Lattice constants
  • wide band gap semiconductors
Optical and Structural Properties of Eu-implanted InxAl1-xN
Year: 2009
Authors: I.S. Roqan, K.P. O’Donnell, C. Trager-Cowan, V. Matias, A. Vantomme
  • Photoluminescence
  • III-V semiconductors
  • Ion Implantation
  • Linewidths
  • Rutherford backscattering
Structural and Optical Characterization of Eu-implanted GaN
Year: 2009
Authors: K.P. O’Donnell, Iman Salem Roqan, K. Wang, K. Lorenz, E. Alves, M. Bockowski
  • Ion Implantation
  • Excitation Mechanism
  • Europium
  • Luminescence
  • Photoluminescence
  • Gallium Nitride
  • Photoluminescence/Excitation
  • PL/E
  • Spectroscopy
  • Eu-Implanted Gan
  • Physics
  • Electronic
  • Optical and Magnetic Materials
  • Atomic and Molecular Physics
Luminescence spectroscopy of Eu implanted zincblende GaN
Year: 2008
Authors: I. S. Roqan, K. P. O’Donnell, C. Trager-Cowan, B. Hourahine, R.W. Martin, K. Lorenz, M. Panfilova, D.J. As, I.M. Watson, E. Alves
  • Spectroscopy
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