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Browsing by Author "FOCA, E."

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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 ...
Efficient focusing with a concave lens based on a photonic crystal with an unusual effective index of refraction

FOCA, E.; FÖLL, H.; DASCHNER, F.; SERGENTU, V. V.; CARSTENSEN, J.; FREY, S.; KNÖCHEL, R.; TIGINYANU, I. M. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2005)

This work reports measurements with a concave lens based on a photonic crystal (PC) structure, which was designed to have an effective index of refraction neff < 1 or even < 0, and which is intended as a model system for ...
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 ...
Focusing slabs made of negative index materials based on inhomogeneous dielectric rods

SERGENTU, V. V.; URSAKI, V. V.; TIGINYANU, I. M.; FOCA, E.; FÖLL, H.; BOYD, Robert W. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2006)

We show the advantages of using inhomogeneous dielectric rods to design photonic crystals that behave as materials with negative refractive index. We found that the analysis of light scattering properties of inhomogeneous ...
Formation of metal wire arrays via electrodeposition in pores of Si, Ge and III–V semiconductors

FANG, C.; FOCA, E.; SIRBU, L.; CARSTENSEN, J.; FÖLL, H.; TIGINYANU, I. M. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2007)

Deep straight macropores in n-type Si have been completely filled with copper (Cu). Homogeneous metal deposition inside the deep pores was achieved by means of electroplating using a solution containing only CuSO4 mixed ...
Impedance Spectroscopy as a Powerful Tool for Better Understanding and Controlling the Pore Growth Mechanism in Semiconductors

COJOCARU, A.; FOCA, E.; CARSTENSEN, J.; LEISNER, M.; TIGINYANU, I. M.; FÖLL, H. (Springer, Berlin, Heidelberg, 2009)

This work shows new results towards a better understanding of macropore growth in semiconductor phenomenology by using in-situ FFT impedance spectroscopy. A new interpretation of the voltage impedance is proposed. In ...
Pore Etching in III-V and II-VI Semiconductor Compounds in Neutral Electrolyte

TIGINYANU, I. M.; URSAKI, V. V.; MONAICO, E.; FOCA, E.; FÖLL, H. (The Electrochemical Society, 2007)

We propose to use a neutral electrolyte based on an aqueous solution of instead of commonly used aggressive acids or alkaline electrolytes for the purpose of electrochemical nanostructuring of and substrates. It is shown ...
Properties of 2D and 3D Dielectric Structures Fabricated by Electrochemical Dissolution of III-V Compounds

TIGINYANU, I. M.; LANGA, S.; CHRISTOPHERSEN, M.; CARSTENSEN, J.; SERGENTU, V.; FOCA, E.; RIOS, O.; FÖLL, H. (Cambridge University Press, 2001)

Porous layers and membranes representing 2D and 3D dielectric structures were fabricated on different III-V compounds (GaAs, InP, GaP) by electrochemical etching techniques. Nonlithographically fabricated ordered nanopore ...
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) ...
Superlensing with plane plates consisting of dielectric cylinders in glass envelopes

FOCA, E.; SERGENTU, V. V.; DASCHNER, F.; TIGINYNAU, I. M.; URSAKI, V. V.; KNÖCHEL, R.; FÖLL, H. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2009)

The approach of designing negative-refractive-index materials on the basis of dielectric rods with a gradient of the dielectric constant is tested experimentally. A triangular-lattice plane-parallel slab assembled from ...

Browsing by Author "FOCA, E."

Browsing by Author "FOCA, E."

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