Dr. István Bányász Profile

Dr. István Bányász

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Publications (28)

Proceedings Article | 6 April 2020 Presentation

Carbon ion microbeam fabrication of channel waveguide in tellurite glass (Conference Presentation)

Stefano Pelli, István Bányász, Edit Szilágyi, Istvan Rajta, Gyula U. L. Nagy, Gualtiero Nunzi Conti, Simone Berneschi, Vladimir Havránek, Vaclav Vosecek, Norbert Nagy, Zoltan Szabó, Miklos Veres, Adolfo Speghini, Giancarlo Righini

Proceedings Volume 11357, 113570X (2020) https://doi.org/10.1117/12.2555707

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Some materials present difficulties for the fabrication of channel waveguides with standard technologies. They may suffer incompatibilities with the physical or chemical processes required in one or more steps involved in the fabrication technology itself or in the standard patterning techniques. An experimental Er3+ doped tungsten-tellurite glass, which gets damaged by standard lithographic techniques is one of such cases. However, this glass is of great interest thanks to its excellent optical and spectroscopic properties, high refractive index (nbulk < 2.0 at 635 nm), low cut-off phonon energy and broad emission bandwidth for the erbium (< 60 nm) within the C band of optical telecommunications. We have therefore successfully demonstrated a novel method of fabrication, namely by focussed C4+ ion beam implantation (FIB). Relatively heavy and swift ions like the ones used in this experiment allow to change the material properties with fluencies even 10 times lower than those required when using light ions. The use of a focussed beam has also allowed us to directly write the channel waveguides on the sample, without the use of any lithographic procedure, which renders the whole process flexible and simpler. The Er3+ doped tellurite glass with 60TeO2–25WO3–15Na2O-0.5Er2O3 (mol. %) composition was prepared by melt-quenching technique. The FIB irradiations were carried out at the 3 MV Tandetron 4130 MC (High Voltage Engineering Europa B.V.) of the Nuclear Physics Institute AV CR, Řež, with 4–6 nA beam current, 1·1014-5·1016 ions/cm2 fluence and the size of the scanning beam was 8 μm × 12 μm. The as-implanted waveguides showed very high propagation losses, about 14-20 dB/cm at 1400 nm, outside the absorption band of Er3+. A stepwise (each step 30 minutes long) thermal annealing allowed to reduce losses. At 150 °C, propagation losses decreased to 1.5 dB/cm. At higher temperatures propagation losses rose again, but at 200 °C coupling losses decreased, so that the best insertion loss, about 5 dB, was measured at this stage. The near-field images showed that the waveguide was monomode up to 1540 nm and that the mode width does not vary significantly with increasing temperature, whereas the estimated depth of the waveguides shows a slight increase. In order to obtain more information about the structural changes caused by the ion beam irradiation, profilometry and Raman characterisation has been carried out on the channel waveguides and also these results will be presented at the conference.

Proceedings Article | 8 March 2014 Paper

Ion beam irradiated optical channel waveguides

I. Bányász, I. Rajta, G. U. Nagy, Z. Zolnai, V. Havranek, S. Pelli, M. Veres, L. Himics, S. Berneschi, G. Nunzi-Conti, G. Righini

Proceedings Volume 8988, 898814 (2014) https://doi.org/10.1117/12.2041697

KEYWORDS: Channel waveguides, Ions, Glasses, Ion beams, Crystals, Waveguides, Silicon, Refractive index, Phase contrast, Erbium

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Proceedings Article | 6 March 2013 Paper

Single- and double-energy N+ - irradiated planar waveguides in eulytine and sillenite type BGO crystals

I. Bányász, Z. Zolnai, S. Pelli, S. Berneschi, M. Fried, T. Lohner, G. Nunzi-Conti, G. Righini

Proceedings Volume 8627, 862705 (2013) https://doi.org/10.1117/12.2004563

KEYWORDS: Waveguides, Ions, Crystals, Refractive index, Planar waveguides, Spectroscopy, Bismuth, Absorption, Ion beams, Physics

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Proceedings Article | 2 February 2012 Paper

Fabrication of barrier-type slab waveguides in Er3+-doped tellurite glass by single and double energy MeV N+ ion implantation

I. Bányász, Z. Zolnai, S. Pelli, S. Berneschi, G. Nunzi-Conti, M. Fried, T. Lohner, P. Petrik, M. Brenci, G. Righini

Proceedings Volume 8264, 826406 (2012) https://doi.org/10.1117/12.910706

KEYWORDS: Waveguides, Refractive index, Ions, Glasses, Ion implantation, Planar waveguides, Spectroscopy, Optical amplifiers, Data modeling, Erbium

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SPIE Journal Paper | 1 July 2011

Slab optical waveguides in Er³⁺-doped tellurite glass by N⁺ ion implantation at 1.5 MeV

Simone Berneschi, Massimo Brenci, Gualtiero Nunzi Conti, Stefano Pelli, Marco Bettinelli, Adolfo Speghini, István Bányász, Andrea Watterich, Miklós Fried, Tivadar Lohner, Péter Petrik, Nguyen Khanh, Zsolt Zolnai

OE, Vol. 50, Issue 07, 071110, (July 2011) https://doi.org/10.1117/12.10.1117/1.3559209

KEYWORDS: Waveguides, Glasses, Ions, Refractive index, Annealing, Erbium, Ion implantation, Physics, Nitrogen, Temperature metrology

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Proceedings Article | 18 May 2010 Paper

Characterisation of slab waveguides, fabricated in CaF2 and Er-doped tungsten-tellurite glass by MeV energy N+ ion implantation, using spectroscopic ellipsometry and m-line spectroscopy

I. Bányász, S. Berneschi, T. Lohner, M. Fried, P. Petrik, N. Khanh, Z. Zolnai, A. Watterich, M. Bettinelli, M. Brenci, G. Nunzi-Conti, S. Pelli, G. Righini, A. Speghini

Proceedings Volume 7719, 77190G (2010) https://doi.org/10.1117/12.854624

KEYWORDS: Waveguides, Refractive index, Glasses, Ions, Spectroscopy, Crystals, Ion implantation, Annealing, Data modeling, Spectroscopic ellipsometry

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Proceedings Article | 10 February 2009 Paper

Annealing effect on optical barrier in ion-implanted tellurite glass waveguides

S. Berneschi, I. Cacciari, G. Nunzi Conti, S. Pelli, G. Righini, I. Bányász, N. Q. Khanh, T. Lohner, P. Petrik, Z. Zolnai, M. Bettinelli, A. Speghini, L. Mescia, F. Prudenzano

Proceedings Volume 7218, 721807 (2009) https://doi.org/10.1117/12.811153

KEYWORDS: Annealing, Ions, Glasses, Waveguides, Refractive index, Spectroscopy, Temperature metrology, Nitrogen, Ion implantation, Ion beams

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Proceedings Article | 5 February 2008 Paper

Nitrogen-ion-implanted planar optical waveguides in Er-doped tellurite glass: fabrication and characterization

I. Bányász, S. Berneschi, I. Cacciari, M. Fried, T. Lohner, G. Nunzi-Conti, F. Pászti, S. Pelli, P. Petrik, G. Righini, A. Watterich, Z. Zolnai

Proceedings Volume 6890, 68901A (2008) https://doi.org/10.1117/12.768507

KEYWORDS: Refractive index, Waveguides, Glasses, Ions, Spectroscopy, Channel waveguides, Nitrogen, Data modeling, Ion implantation, Phase contrast

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Proceedings Article | 2 March 2007 Paper

Channel waveguides fabrication in Er3+-doped tellurite glass by ion beam irradiation

S. Berneschi, M. Brenci, G. Nunzi Conti, S. Pelli, G. Righini, I. Bányász, A. Watterich, N. Khanh, M. Fried, F. Pászti

Proceedings Volume 6475, 647509 (2007) https://doi.org/10.1117/12.702085

KEYWORDS: Glasses, Channel waveguides, Erbium, Waveguides, Ions, Ion beams, Refractive index, Silicon, Absorption, Optical amplifiers

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Proceedings Article | 20 February 2007 Paper

Quasi in situ microscopic study of hologram build-up in LiNbO₃ crystals

István Bányász, Gábor Mandula

Proceedings Volume 6488, 648808 (2007) https://doi.org/10.1117/12.701887

KEYWORDS: Holograms, Diffraction gratings, Crystals, Diffraction, Holography, Microscopy, Modulation, Iron, Microscopes, Crystallography

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Proceedings Article | 9 June 2006 Paper

Direct microscopic observation of hologram build-up in photorefractive crystals

István Bányász, Gábor Mandula

Proceedings Volume 6252, 625209 (2006) https://doi.org/10.1117/12.676515

KEYWORDS: Holograms, Crystals, Diffraction gratings, Microscopy, Holography, Diffraction, Microscopes, Refractive index, Modulation, Iron

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Proceedings Article | 7 July 2005 Paper

Laser irradiation, ion implantation and e-beam writing of integrated optical structures

Giancarlo Righini, I. Banyasz, S. Berneschi, M. Brenci, A. Chiasera, M. Cremona, D. Ehrt, M. Ferrari, R. Montereali, G. Nunzi Conti, S. Pelli, S. Sebastiani, C. Tosello

Proceedings Volume 5840, (2005) https://doi.org/10.1117/12.609231

KEYWORDS: Laser induced fluorescence, Glasses, Waveguides, Crystals, Integrated optics, Ions, Channel waveguides, Thin films, Laser crystals, Electrons

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Proceedings Article | 13 June 2005 Paper

High-resolution lensless Fourier-transform digital holography

Istvan Banyasz, Janos Kornis

Proceedings Volume 5856, (2005) https://doi.org/10.1117/12.612834

KEYWORDS: Digital holography, Holograms, Holography, 3D image reconstruction, Charge-coupled devices, Digital recording, Spatial frequencies, Microscopy, Wavefronts, Optical simulations

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Proceedings Article | 1 September 2004 Paper

Analysis of grating profiles of phase holograms recorded in silver halide emulsions and processed with combinations of various developers and bleaching agents

Istvan Banyasz

Proceedings Volume 5456, (2004) https://doi.org/10.1117/12.545155

KEYWORDS: Modulation, Refractive index, Visibility, Holograms, Phase shift keying, Phase contrast, Holography, Spatial frequencies, Photomicroscopy, Silver

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Proceedings Article | 1 September 2004 Paper

Comparison of various bleaching processes for silver halide holographic emulsions using the refractive index modulation versus before-bleach optical density characteristics

Istvan Banyasz

Proceedings Volume 5456, (2004) https://doi.org/10.1117/12.545050

KEYWORDS: Holograms, Modulation, Visibility, Phase shift keying, Absorbance, Holography, Refractive index, Microscopy, Spatial frequencies, Phase contrast

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Proceedings Article | 4 June 2003 Paper

Measurement of nonlinear characteristics of silver-halide holographic materials by phase-contrast microscopy

Istvan Banyasz

Proceedings Volume 5005, (2003) https://doi.org/10.1117/12.473953

KEYWORDS: Holograms, Microscopy, Holography, Phase contrast, Modulation, Photomicroscopy, Diffraction, Spatial frequencies, Visibility, Holographic materials

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Proceedings Article | 4 June 2003 Paper

Measurement and modeling of the full nonlinear characteristics of silver-halide holographic recording materials

Istvan Banyasz

Proceedings Volume 5005, (2003) https://doi.org/10.1117/12.473821

KEYWORDS: Holography, Holograms, Modulation transfer functions, Diffraction, Holographic materials, Visibility, Diffraction gratings, Spatial frequencies, Silver, Image quality

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Proceedings Article | 3 April 2003 Paper

Phase grating fabrication in glass via ion implantation

Istvan Banyasz, Miklos Fried, Csaba Duecso, Zofia Vertesy

Proceedings Volume 4944, (2003) https://doi.org/10.1117/12.472008

KEYWORDS: Diffraction gratings, Ions, Diffraction, Glasses, Energy efficiency, Ion implantation, Modulation, Nitrogen, Helium, Phase measurement

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Proceedings Article | 3 October 2000 Paper

Semiphysical development of holograms recorded in silver halide emulsions

Istvan Banyasz, Augusto Beléndez, Inmaculada Pascual, Antonio Fimia

Proceedings Volume 4149, (2000) https://doi.org/10.1117/12.402460

KEYWORDS: Holograms, Diffraction, Silver, Absorbance, Photomicroscopy, Phase contrast, Sodium, Carbonates, Absorption, Holography

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Proceedings Article | 18 June 1998 Paper

Fabrication of phase gratings in glass by ion implantation

Istvan Banyasz, Miklos Fried, Csaba Duecso, Zofia Vertesy, Csaba Hajdu

Proceedings Volume 3291, (1998) https://doi.org/10.1117/12.310575

KEYWORDS: Diffraction gratings, Ions, Diffraction, Glasses, Energy efficiency, Modulation, Ion implantation, Scanning electron microscopy, Helium, Nitrogen

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Proceedings Article | 26 March 1998 Paper

Highly nonlinear characteristics of bleached holograms recorded in Agfa 8E75HD plates

Istvan Banyasz, Augusto Belendez, Antonio Fimia

Proceedings Volume 3294, (1998) https://doi.org/10.1117/12.304517

KEYWORDS: Holograms, Visibility, Absorption, Diffraction, Phase shift keying, Modulation, Absorbance, Silver, Holography, Holographic materials

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Proceedings Article | 20 December 1996 Paper

Nonlinear holographic recording in thermoplastic materials

Istvan Banyasz

Proceedings Volume 2951, (1996) https://doi.org/10.1117/12.262428

KEYWORDS: 3D image reconstruction, Holograms, Modulation transfer functions, Holography, Diffraction, Ronchi rulings, Image analysis, Image quality, Spatial frequencies, Holographic materials

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Proceedings Article | 23 March 1995 Paper

Holographic recording with a near-IR sensitive photopolymer system using a laser diode

Istvan Banyasz, Daniel-Joseph Lougnot, Colette Turck

Proceedings Volume 2405, (1995) https://doi.org/10.1117/12.205361

KEYWORDS: Holography, Holograms, Semiconductor lasers, Holographic interferometry, Diffraction gratings, 3D image reconstruction, Laser systems engineering, Diffraction, Optical resolution, Refractive index

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Proceedings Article | 12 January 1994 Paper

New model of practical holography

Istvan Banyasz

Proceedings Volume 2043, (1994) https://doi.org/10.1117/12.165576

KEYWORDS: 3D image reconstruction, Holograms, Holography, Diffraction, Modulation transfer functions, Ronchi rulings, Silver, Image quality, Image resolution, Spatial resolution

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SPIE Journal Paper | 1 October 1993

Evaluation of the imaging properties of holograms recorded in materials of limited spatial resolution

Istvan Banyasz

OE, Vol. 32, Issue 10, (October 1993) https://doi.org/10.1117/12.10.1117/12.145375

KEYWORDS: Holograms, 3D image reconstruction, Holography, Silver, Modulation transfer functions, Diffraction, Image quality, Spatial resolution, Image resolution, Amplitude modulation

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Proceedings Article | 26 July 1993 Paper

New, exact methods of the treatment of the effects of nonlinear recording in holography

István Bányász

Proceedings Volume 1983, 19836D (1993) https://doi.org/10.1117/12.2308648

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Proceedings Article | 2 March 1993 Paper

Resolution and field-range limitations in holography imposed by film MTF and nonlinearity

Istvan Banyasz

Proceedings Volume 1732, (1993) https://doi.org/10.1117/12.140396

KEYWORDS: 3D image reconstruction, Holograms, Holography, Modulation transfer functions, Diffraction, Image quality, Spatial frequencies, Silver, Spatial resolution, Image resolution

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Proceedings Article | 1 October 1991 Paper

Resolution problems in holography

Istvan Banyasz

Proceedings Volume 1574, (1991) https://doi.org/10.1117/12.50128

KEYWORDS: 3D image reconstruction, Holograms, Image quality, Diffraction, Holography, Spatial resolution, Diffractive optical elements, Image resolution, Optical resolution, Gaussian beams

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Showing 5 of 28 publications

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