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Browsing Articole din publicaţii internaţionale by Author "TIGINYANU, Ion M."

Browsing Articole din publicaţii internaţionale by Author "TIGINYANU, Ion M."

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  • Band tail state related photoluminescence and photoresponse of ZnMgO solid solution nanostructured films 
    MORARI, Vadim; PANTAZI, Aida; CURMEI, Nicolai; POSTOLACHE, Vitalie; RUSU, Emil V.; ENACHESCU, Marius; TIGINYANU, Ion M.; URSAKI, Veaceslav V. (Beilstein Institute for the Advancement of Chemical Sciences, Germany, 2020)
    A series of Zn1−xMgxO thin films with the composition range x = 0.00–0.40 has been prepared by sol–gel spin coating on Si substrates with a post-deposition thermal treatment in the temperature range of 400–650 °C. The ...
  • Controlled Electroplating of Noble Metals on III-V Semiconductor Nanotemplates Fabricated by Anodic Etching of Bulk Substrates 
    MONAICO, Elena I.; MONAICO, Eduard V.; URSAKI, Veaceslav V.; TIGINYANU, Ion M. (MDPI (Basel, Switzerland), 2022)
    Porous templates are widely used for the preparation of various metallic nanostructures. Semiconductor templates have the advantage of controlled electrical conductivity. Site-selective deposition of noble metal formations, ...
  • Efficient Focusing with an Ultra-Low Effective-Index Lens Based on Photonic Crystals 
    FOCA, Eugen; FÖLL, Helmut; DASCHNER, Frank; SERGENTU, Vladimir V.; CARSTENSEN, Jürgen; KNÖCHEL, Reinhard; TIGINYANU, Ion M. (Cambridge University Press, 2005)
    This work focuses on photonic crystals (PC) that can be ascribed an effective index of refraction > 1 or even > 0. We investigate the possibility to design optical elements (in this case a lens) based on this type of PC. ...
  • Electrochemical nanostructuring of (111) oriented GaAs crystals: from porous structures to nanowires 
    MONAICO, Elena I.; MONAICO, Eduard V.; URSAKI, Veaceslav V.; HONNALI, Shashank; POSTOLACHE, Vitalie; LEISTNER, Karin; NIELSCH, Kornelius; TIGINYANU, Ion M. (Beilstein Institute for the Advancement of Chemical Sciences, Germany, 2020)
    A comparative study of the anodization processes occurring at the GaAs(111)A and GaAs(111)B surfaces exposed to electrochemical etching in neutral NaCl and acidic HNO3 aqueous electrolytes is performed in galvanostatic and ...
  • Fabrication of photonic crystal circuits based on GaN ultrathin membranes by maskless lithography 
    VOLCIUC, Olesea; BRANISTE, Tudor; SERGENTU, Vladimir; URSAKI, Veaceslav; TIGINYANU, Ion M.; GUTOWSKI, Jürgen (Society of Photo-Optical Instrumentation Engineers, SPIE, 2015)
    We report on maskless fabrication of photonic crystal (PhC) circuits based on ultrathin (d~15 nm) nanoperforated GaN membranes exhibiting a triangular lattice arrangement of holes with diameters of 150 nm. Ultrathin GaN ...
  • Flame based growth of ZnO nano- and microstructures for advanced optical, multifunctional devices, and biomedical applications (Conference Presentation) 
    MISHRA, Yogendra K.; GRÖTTRUP, Jorit; SMAZNA, Daria; HÖLKEN, Iris; HOPPE, Mathias; SINDUSHREE, Sindushree; KAPS, Sören; LUPAN, Oleg; SEIDEL, Jan; MONTEIRO, Teresa; TIGINYANU, Ion M.; KIENLE, Lorenz; RONNING, Carsten; SCHULTE, Karl; FIEDLER, Bodo; ADELUNG, Rainer (SPIE, Society of Photo-Optical Instrumentation Engineers, 2017)
    The ZnO micro- and nanoneedles grown at walls in silicon trenches showed excellent whispering gallery mode resonances and photocatalytic properties. Using the same strategy, large polycrystalline micro- and nanostructured ...
  • Free-Standing Large-Area Nanoperforated Gold Membranes Fabricated by Hopping Electrodeposition 
    MONAICO, Eduard V.; MONAICO, Elena I.; URSAKI, Veaceslav V.; TIGINYANU, Ion M. (The Electrochemical Society, 2020)
    A room-temperature two-step cost-effective electrochemical technology is proposed for the preparation of free-standing Au nanomembranes. A thin Au film with the thickness less than 100 nm was deposited by pulsed electroplating ...
  • Gold coated microstructures as a platform for the preparation of semiconductor-based hybrid 3D micro-nano-architectures 
    MONAICO, Eduard V.; URSAKI, Veaceslav V.; TIGINYANU, Ion M. (Springer Nature Switzerland, 2023)
    In this paper, three types of microstructures are argued as substrates for electrochemical deposition of Au nanodots. They include: (a) aero-GaN consisting of hollow GaN microtetrapods, (b) microdomains of pores with a ...
  • Multilayer porous structures on GaN for the fabrication of Bragg reflectors 
    BRANISTE, Tudor; MONAICO, Eduard; MARTIN, Denis; CARLIN, Jean-François; POPA, Veaceslav; URSAKI, Veaceslav V.; GRANDJEAN, Nicolas; TIGINYANU, Ion M. (Society of Photo-Optical Instrumentation Engineers, SPIE, 2017)
    We report on the development of electrochemical etching technology for the production of multilayer porous structures (MPS) allowing one to fabricate Bragg reflectors on the basis of GaN bulk substrates grown by Hydride ...
  • Multilayer porous structures on GaN for the fabrication of Bragg reflectors 
    BRANISTE, Tudor; MONAICO, Eduard; MARTIN, Denis; CARLIN, Jean-François; POPA, Veaceslav; URSAKI, Veaceslav V.; GRANDJEAN, Nicolas; TIGINYANU, Ion M. (SPIE, 2017)
    We report on the development of electrochemical etching technology for the production of multilayer porous structures (MPS) allowing one to fabricate Bragg reflectors on the basis of GaN bulk substrates grown by Hydride ...
  • Photoluminescence of Eu-doped ZnO structures 
    URSAKI, Veaceslav V.; RUSU, Emil; ZALAMAI, Victor; SIRBU, Lilian; MONAICO, Eduard; TIGINYANU, Ion M. (Society of Photo-Optical Instrumentation Engineers, SPIE, 2004)
    ZnO-based red phosphors were prepared by different methods. One phosphor was grown from a Na2B4O7 melt, and another one was prepared from a ZnO:Eu2O3 powder via electron beam treatment. The e-beam processing is found to ...
  • Porous Semiconductor Compounds with Engineered Morphology as a Platform for Various Applications 
    MONAICO, Eduard V.; MONAICO, Elena I.; URSAKI, Veaceslav V.; TIGINYANU, Ion M. (Wiley-VCH GmbH, Weinheim, 2023)
    Porous semiconductor compounds represent a class of materials which is under an intense research focus over the last years. Herein, morphologies and topologies produced by anodization in binary semiconductor compounds ...
  • Possible coherent backscattering of lightwaves from a strongly absorbing nanoporous medium 
    GAPONENKO, Sergey V.; MONAICO, Eduard; SERGENTU, Vladimir V.; PRISLOPSKI, Sergey Ya.; TIGINYANU, Ion M. (IOP Publishing, 2018)
    We report on anomalous light retroreflection from strongly absorbing nanoporous semiconductor materials, GaAs and InP, with strongly polarized retroreflected light with linear polarization coinciding with that of incident ...
  • Structural and Vibrational Study of Pseudocubic CdIn2Se4 under Compression 
    SANTAMARÍA-PÉREZ, David; GOMIS, Oscar; PEREIRA, André L. J.; VILAPLANA, Rosario; POPESCU, Catalin; SANS, Juan Angel; MANJÓN, Francisco Javier; RODRÍGUEZ-HERNÁNDEZ, Placida; MUÑOZ, Alfonso; URSAKI, Vladislav V.; TIGINYANU, Ion M. (American Chemical Society, 2014)
    We report a comprehensive experimental and theoretical study of the structural and vibrational properties of α-CdIn2Se4 under compression. Angle-dispersive synchrotron X-ray diffraction and Raman spectroscopy evidence that ...
  • Surface charge lithography for GaN micro- and nanostructuring 
    TIGINYANU, Ion M.; POPA, Veaceslav; SARUA, Andrei; HEARD, Peter J.; VOLCIUC, Olesea; KUBALL, Martin (Society of Photo-Optical Instrumentation Engineers, SPIE, 2009)
    We demonstrate the possibility for controlled micro- and nanostructuring of GaN layers by low-dose focusedion-beam (FIB) treatment with subsequent photoelectrochemical (PEC) etching. The proposed novel maskless approach ...
  • Ultrafast third-order optical nonlinearity in SnS2 layered compound for photonic applications 
    PETRIS, Adrian; GHEORGHE, Petronela S.; VLAD, Valentin I.; RUSU, Emil; URSAKI, Veaceslav V.; TIGINYANU, Ion M. (ELSEVIER, 2018)
    The ultrafast nonlinear optical response of SnS2 layered compound, excited by high-repetition-rate ultrashort (fs) pulses at 1550 nm wavelength, is investigated for the first time by optical third harmonic generation. In ...

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