Articole ştiinţifice: Recent submissions

  • Terahertz conductivity of magnetoexcitons and electrons in semiconductor nanostructures 
    LLOYD-HUGHES, J.; FAIST, J.; BEERE, H. E.; RITCHIE, D. A.; SIRBU, L.; TIGINYANU, I. M.; MERCHANT, S. K. M.; JOHNSTON, M. B. (Society of Photo-Optical Instrumentation Engineers, SPIE, 2009)
    Using terahertz time-domain spectroscopy we investigate how quantum, magnetic and electrostatic confinement alters the photoconductivity of nanostructured semiconductors. In 2.0 THz and 2.9THz GaAs/AlGaAs quantum cascade ...
  • Raman scattering by porous structures with InAs quantum dots 
    MILEKHIN, Alexander; URSAKI, Veacheslav; SIRBU, Lilian; TOROPOV, Alexander; TIGINYANU, Ion; ZAHN, Dietrich R. T. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2009)
    In this paper we search for the possibilities of introducing porosity in InAs/AlAs/GaAs multilayer quantum dot structures as an additional tool for the modification of their phonon spectrum. Raman spectroscopy is used as ...
  • Porous morphologies in Si, III-V and II-VI compounds: a comparative study 
    LANGA, S.; MONAICO, E.; FÖLL, H.; TIGINYANU, I. M. (Technical University of Moldova, 2009)
    Porous morphologies obtained during the anodization of semiconductors are mainly determined by particular characteristics of the semiconductor-electrolyte interfaces and the bulk properties of the semiconductor itself. ...
  • Nanostructured indium phosphide used in electrowetting system for biosensor applications 
    SIRBU, L.; VODA, I.; ESINENCO, D.; MULLER, R.; VOICU, R.; DANILA, M.; GHIMPU, L.; TIGINYANU, I. M.; URSAKI, V. (IEEE, 2011)
    We demonstrated the fabrication of complex nanostructured InP membranes with porous compact packed structure that have been cut during electrochemical etching in the same anodic process. The membranes were filled with ...
  • Nanostructured Film of Indium Phosphide as Biosensor in 1D Array Electrowetting System 
    SIRBU, Lilian; VODĂ, Irina; ESINENCO, Dorin; GANGAN, Sergiu; MULLER, Raluca; VOICU, Rodica Cristina; DǍNILǍ, Mihai; GHIMPU, Lidia; TIGINYANU, Ion; URSAKI, Veacheslav (Romanian Academy Publishing House, 2011)
    We demonstrated the fabrication of complex nanostructured InP membranes with porous compact packed structure that have been cut during electrochemical etching in the same anodic process. The membranes were filled with ...
  • Metal nanostructured ferromagnetic as a possible source of optical magnetism 
    SERGENTU, V. V.; TIGINYANU, I. M.; URSAKI, V. V. (IOP Publishing, 2012)
    It is shown analytically that plasmon-mediated magnetic response can be realized at optical frequencies in nanostructured magnetized metallic ferromagnetics under certain restrictions on their electronic subsystem. According ...
  • Nearfield effect in a nanotube/nanopor array system for application in EWOD devices that are operating in THz region 
    SIRBU, Lilian; SERGENTU, Vladimir; VOICU, Rodica; TIGINYANU, Ion; URSAKI, Veaceslav (IEEE, 2012)
    We present a theoretical model for propagation of EM wav. in various kinds of structures such as arrays of monolayer cylinders, multilayer cylinders, non-metallized and metallised pores. An analytical method was developed ...
  • Renormalization of the Coulomb law in anomalous electron transport with giant current density at room temperature 
    SERGENTU, V.; TIGINYANU, I.; URSAKI, V. (Editura Academiei Romane, 2013)
    We propose an explanation of anomalous electron transport with giant current density at room temperature as a manifestation of high-temperature superconductivity in artificial periodic lattices of metallic nanospheres. The ...
  • Obtaining of II-VI compound substrates with controlled electrical parameters and prospects of their application for nanoporous structures 
    COLIBABA, Gleb; GONCEARENCO, Evghenii; NEDEOGLO, Dmitrii; NEDEOGLO, Natalia; MONAICO, Eduard; TIGINYANU, Ion (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2014)
    Substrates of II-VI semiconductor compounds may be widely used in fabrication of nanoporous matrices (NM), which give the possibility to obtain nanowires and nanotubes of various materials with good application prospects ...
  • Flexible photonic crystals based on ultrathin membranes 
    TIGINYANU, Ion (Editura Academiei Romane, 2015)
    A breakthrough is reported in the maskless fabrication of flexible photonic crystals based on ultrathin inorganic membranes. Taking into account the concept of Surface Charge Lithography proposed previously [1], a technological ...
  • “Dark” modes backscattering as possible rationale for anomalous retroreflection from strongly absorbing porous nanostructures 
    SERGENTU, V. V.; URSAKI, V.; MONAICO, Ed.; TIGINYANU, I. M.; PRISLOPSKI, S. Ya.; GAPONENKO, S. V. (World Scientific, 2017)
    The previously discovered anomalous retroreflection in a strongly absorbing nanostructured medium is explained by using “dark” and “bright” modes. The consideration provides rationale not only for the retroreflection itself ...
  • Optical constants of ZnSxSe1–x thin films calculated from transmission spectra 
    POPA, Mihail; TIGINYANU, Ion; URSAKI, Veacheslav (Institutul de Inginerie Electronică şi Nanotehnologii "D. Ghiţu" al AŞM, 2017)
    We report the results of calculations of some optical parameters of ZnSxSe1–x thin films based on measured transmission spectra by using the Swanepoel’s method, the Wemple– DiDomenico single-oscillator model, and the ...
  • Characterization of core/shell structures based on CdTe and GaAs nanocrystalline layers deposited on SnO2 microwires 
    GHIMPU, L.; URSAKI, V. V.; PANTAZI, A.; MESTERCA, R.; BRÂNCOVEANU, O.; SHREE, Sindu; ADELUNG, R.; TIGINYANU, I. M.; ENACHESCU, M. (ELSEVIER, 2018)
    We report the fabrication and characterization of SnO2/CdTe and SnO2/GaAs core/shell microstructures. CdTe or GaAs shell layers were deposited by radio-frequency (RF) magnetron sputtering on core SnO2 microwires synthesized ...
  • Polarized Retroreflection from Nanoporous III–V Semiconductors 
    PRISLOPSKI, S. Ya.; GAPONENKO, S. V.; MONAICO, E.; SERGENTU, V. V.; TIGINYANU, I. M. (Springer Nature Switzerland, 2018)
    Retroreflected light with strong linear polarization coinciding with that of the incident beams is detected from strongly absorbing nanoporous III–V semiconductors. Because of high polarization of retroreflected waves we ...
  • Electrochemical Deposition by Design of Metal Nanostructures 
    MONAICO, Ed.; MONAICO, E. I.; URSAKI, V. V.; TIGINYANU, I. M.; NIELSCH, K. (Springer Nature Switzerland, 2019)
    We report on the application of specially-designed masks for the purpose of electrochemical etching of InP single crystals which enables one to change in a controlled fashion the direction of propagation of pores, including ...
  • Modulation of Electrical Conductivity and Lattice Distortions in Bulk HVPE-Grown GaN 
    WOLFF, Niklas; JORDT, Philipp; BRANISTE, Tudor; POPA, Veaceslav; MONAICO, Eduard; URSAKI, Veaceslav; PETRARU, Adrian; ADELUNG, Rainer; MURPHY, Bridget M.; KIENLE, Lorenz; TIGINYANU, Ion (The Electrochemical Society, 2019)
    The nature of self-organized three-dimensional structured architectures with spatially modulated electrical conductivity emerging in the process of hydride vapor phase epitaxial growth of single crystalline n-GaN wafers ...
  • Micrometer-size GaN Schottky-diodes for mm-wave frequency multipliers 
    COJOCARI, O.; POPA, V.; URSAKI, V. V.; TIGINYANU, I. M.; MUTAMBA, K.; SAGLAM, M.; HARTNAGEL, H. L. (IEEE, 2004)
    Small-size Pt/n-GaN Schottky diodes are fabricated using electrochemical technique for anode metallisation. Effects of surface passivation and thermal annealing on the interface quality are studied using PL-measurements ...
  • The Way to Uniformity in Porous III–V Compounds via Self-Organization and Lithography Patterning 
    LANGA, S.; CARSTENSEN, J.; CHRISTOPHERSEN, M.; FÖLL, H.; TIGINYANU, I. M. (Springer Nature Switzerland, 2005)
    The factors determining the morphology of electrochemically etched III–V compounds have been reviewed by Gomes and Goossens as well as by Notten et al. [1,2]. Under anodic conditions the p- and n-type materials were found ...
  • Surface plasmon resonance in Ag nanoparticles deposited inside porous GaP templates 
    SIRBU, L.; SERGENTU, V.; URSAKI, V.; TIGINYANU, I.; PIREDDA, G.; BOYD, R. W. (IEEE, 2008)
    Surface plasmon resonance is studied for Ag nanoparticles electrochemically deposited on bulk GaP substrates and inside porous GaP templates. The size and density of Ag nanoparticles are controlled by the conditions of ...
  • Nanoimprint lithography (NIL) and related techniques for electronics applications 
    TIGINYANU, I.; URSAKI, V.; POPA, V. (Woodhead Publishing, 2011)
    This chapter provides a review of nanoimprint lithography techniques, highlighting their potential to surpass photolithography in resolution, and, at the same time, to allow mass fabrication at a lower cost. The current ...

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