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Dive into the research topics where Benedek J. Nagy is active.

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Featured researches published by Benedek J. Nagy.


Nano Letters | 2015

Ultrafast Electron Emission from a Sharp Metal Nanotaper Driven by Adiabatic Nanofocusing of Surface Plasmons

Jan Vogelsang; Jörg Robin; Benedek J. Nagy; Péter Dombi; Daniel Rosenkranz; Manuela Schiek; Petra Groß; Christoph Lienau

We report photoelectron emission from the apex of a sharp gold nanotaper illuminated via grating coupling at a distance of 50 μm from the emission site with few-cycle near-infrared laser pulses. We find a fifty-fold increase in electron yield over that for direct apex illumination. Spatial localization of the electron emission to a nanometer-sized region is demonstrated by point-projection microscopic imaging of a silver nanowire. Our results reveal negligible plasmon-induced electron emission from the taper shaft and thus efficient nanofocusing of few-cycle plasmon wavepackets. This novel, remotely driven emission scheme offers a particularly compact source of ultrashort electron pulses of immediate interest for miniaturized electron microscopy and diffraction schemes with ultrahigh time resolution.


46th Annual Laser Damage Symposium - Laser-Induced Damage in Optical Materials: 2014 | 2014

Femtosecond damage threshold at kHz and MHz pulse repetition rates

Benedek J. Nagy; Lénárd Vámos; Dániel Oszetzky; Péter Rácz; Péter Dombi

Femtosecond laser-induced damage threshold (LIDT) measurements for different optical components are well studied for a set of laser pulse repetition rates spanning the range between 1 Hz and 1 kHz. Recent years saw the advent of high-repetition-rate femtosecond systems with relatively high pulse energy. Therefore investigation of LIDT in the MHz region is essential. We performed several comparative femtosecond LIDT measurements on typically used ultrafast optical elements with different Ti:Sapphire laser systems having substantially different pulse repetition rates (a 1 kHz regenerative amplifier and a 4.3 MHz long-cavity oscillator) and found a substantially lower MHz LIDT threshhold.


Optics Letters | 2016

Femtosecond damage resistance of femtosecond multilayer and hybrid mirrors

Viktória Csajbók; Lőrinc Szikszai; Benedek J. Nagy; Péter Dombi

Improving the laser-induced damage threshold of optical components is a basic endeavor in femtosecond technology. By testing more than 30 different femtosecond mirrors with 42 fs laser pulses at 1 kHz repetition rate, we found that a combination of high-bandgap dielectric materials and improved design and coating techniques enable femtosecond multilayer damage thresholds exceeding 2  J/cm2 in some cases. A significant ×2.5 improvement in damage resistance can also be achieved for hybrid Ag-multilayer mirrors exhibiting more than 1  J/cm2 threshold with a clear anticorrelation between damage resistance and peak field strength in the stack. Slight dependence on femtosecond pulse length and substantial decrease for high (megahertz) repetition rates are also observed.


Proceedings of SPIE | 2015

Ultrafast coherent dynamics of Rydberg electrons bound in the image potential near a single metallic nano-object (Presentation Recording)

Jörg Robin; Jan Vogelsang; Benedek J. Nagy; P. Gross; Christoph Lienau

Image potential states are well established surface states of metallic films [1]. For a single metallic nanostructure these surface states can be localized in the near-field arising from illumination by a strong laser field. Thus single metallic nanostructures offer the unique possibility to study quantum systems with both high spatial and ultrafast temporal resolution. Here, we investigate the dynamics of Rydberg states localized to a sharp metallic nanotaper. For this purpose we realized a laser system delivering few-cycle pulses tunable over a wide wavelength range [2]. Pulses from a regenerative titanium:sapphire amplifier generate a white light continuum, from which both a proportion in the visible and in the infrared are amplified in two non-collinear optical parametric amplification (NOPA) stages. Difference frequency generation (DFG) of both stages provides pulses in the near-infrared. With a precisely delayed sequence of few-cycle pulses centered around 600 nm (NOPA#1 output) and 1600 nm (DFG output) we illuminate the apex of a sharply etched gold tip. Varying the delay we observe an exponential decay of photoemitted electrons with a distinctly asymmetric decay length on both sides, indicating the population of different states. Superimposed on the decay is a clearly discernible quantum beat pattern with a period of <50 fs, which arises from the motion of Rydberg photoelectrons bound within their own image potential. These results therefore constitute a step towards controlling single electron wavepackets released from a gold tip opening up fascinating perspectives for applications in ultrafast electron microscopy [3]. [1] Hofer, U. et al. Science 277, 1480 (1997) [2] Vogelsang, J., Robin J. et al. Opt. Express 22, 25295 (2014) [3] Petek, H. et al. ACS Nano 8, 5 (2014)


Applied Optics | 2018

Ultrafast multipulse damage threshold of femtosecond high reflectors

Viktória Csajbók; Zsolt Bedőházi; Benedek J. Nagy; Péter Dombi


conference on lasers and electro optics | 2016

Remotely driven electron emission for ultrafast electron microscopy

Jan Vogelsang; Jörg Robin; Benedek J. Nagy; Péter Dombi; Daniel Rosenkranz; Manuela Schiek; Petra Groß; Christoph Lienau


conference on lasers and electro optics | 2016

Strong field above threshold ionization of rydberg electrons localized to a gold nanotip

Jörg Robin; Jan Vogelsang; Benedek J. Nagy; Péter Dombi; Petra Groß; Christoph Lienau


International Conference on Ultrafast Phenomena (2016), paper UTu5A.3 | 2016

A Road toward Attosecond Physics in Solids - Atomic-Like Rydberg States Localized at a Nanotip

Jörg Robin; Jan Vogelsang; Benedek J. Nagy; Péter Dombi; Christoph Lienau; P. Gross


International Conference on Ultrafast Phenomena | 2016

Efficient Emission of Ultrafast Electron Bursts by Plasmonic Nanofocusing of Light

Jan Vogelsang; Jörg Robin; Benedek J. Nagy; Péter Dombi; P. Gross; Christoph Lienau


Archive | 2014

Femtoszekundumos roncsolási küszöb mérése kHz-es és MHz-es ismétlési frekvencián

Benedek J. Nagy; Lénárd Vámos; Dániel Oszetzky; Péter Rácz; Péter Dombi

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Péter Dombi

Hungarian Academy of Sciences

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Jörg Robin

University of Oldenburg

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Péter Rácz

Hungarian Academy of Sciences

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P. Gross

University of Münster

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Petra Groß

University of Münster

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Dániel Oszetzky

Hungarian Academy of Sciences

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Lénárd Vámos

Hungarian Academy of Sciences

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