IRTUM – Institutional Repository of the Technical University of Moldova

Browsing Articole din publicaţii internaţionale by Subject "lenses"

Browsing Articole din publicaţii internaţionale by Subject "lenses"

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  • Adjustable magnetorheologic gradient lenses 
    NISTIRIUC, P. V.; TURCAN, D. N.; ALEXEI, A. S.; NISTIRIUC, I. V.; BEREGOI, E. A.; SAJIN, M. K.; SCUTARI, G. (IEEE, 2000)
    Elaboration results of adjustable magnetorheologic gradient lenses based on Y/sub 3/Fe/sub 5/O/sub 12/ powder are presented. Magnetorheologic lenses permit to change its focus radius by means of magnetic field.
  • Design and Characterization of Novel Focusing Elements Based on Photonic Metamaterials 
    TIGINYANU, I. M.; FOCA, E.; SERGENTU, V. V.; URSAKI, V. V.; DASCHNER, F.; KNÖCHEL, R.; FÖLL, H. (American Scientific Publishers, 2009)
    New results in the development of photonic metamaterials based on two dimensional periodic dielectric structures are reported. We show that concave and flat lenses consisting of homogeneous or inhomogeneous dielectric rods ...
  • Design of negative-refractive-index materials on the basis of rods with a gradient of the dielectric constant 
    SERGENTU, V. V.; URSAKI, V. V.; TIGINYANU, I. M.; FOCA, F.; FÖLL, H.; BOYD, Robert W. (American Institute of Physics, 2007)
    The authors propose an approach to the design of negative-refractive-index materials based on the use of dielectric rods with a gradient of the dielectric constant. A triangular-lattice photonic crystal assembled from ...
  • Focusing effect of photonic crystal concave lenses made from porous dielectrics 
    SERGENTU, V. V.; FOCA, E.; LANGA, S.; CARSTENSEN, J.; FÖLL, H.; TIGINYANU, I. M. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2004)
    In the present paper we show the photonic band structure and transmittance spectra of photonic crystal (PC) consisting of porous dielectric and compare the results with the earlier published. Frequency ranges, where PC can ...
  • Prediction of negative index material lenses based on metallo-dielectric nanotubes 
    SERGENTU, V. V.; TIGINYANU, I. M.; URSAKI, V. V.; ENACHI, M.; ALBU, S. P.; SCHMUKI, P. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2008)
    We propose to assemble negative index materials (NIMs) from dielectric nanotubes with inner and outer surfaces covered by thin metallic films. The focusing properties of flat and concave lenses assembled from metallized ...
  • Quasi-Ordered Networks of Metal Nanotubes Embedded in Semiconductor Matrices for Photonic Applications 
    TIGINYANU, I. M.; URSAKI, V. V.; MONAICO, E.; ENACHI, M.; SERGENTU, V. V.; COLIBABA, G.; NEDEOGLO, D. D.; COJOCARU, A.; FÖLL, H. (American Scientific Publishers, 2011)
    We report on templated fabrication of metal nanotubes by electrochemical pulsed deposition of Pt in InP and ZnSe porous layers with pore diameters from 40 to 400 nm. Ordered two-dimensional hexagonal arrays of pores are ...
  • Strongly frequency dependent focusing efficiency of a concave lens based on two-dimensional photonic crystals 
    FOCA, E.; FÖLL, H.; CARSTENSEN, J.; SERGENTU, V. V.; TIGINYANU, I. M.; DASCHNER, F.; KNÖCHEL, R. (American Institute of Physics, 2006)
    Results of an experimental study of a concave lens based on a two-dimensional microwave photonic crystal with neff<1 are shown. We demonstrate that the lens focuses electromagnetic radiation for transverse electric (TE) ...
  • TiO2 nanotubular structures for optoelectronic and photonic applications 
    ENACHI, Mihai; CIOBANU, Vladimir; SERGENTU, Vladimir; URSAKI, Veaceslav (Romanian Academy, 2015)
    We prove analytically that metallized TiO2 nanotubular structures are characterized by negative refractive index which opens the possibility for their use as cost-effective focusing elements. Flat and concave lenses assembled ...

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