Benedek J. Nagy
University of Pécs
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Benedek J. Nagy.
Nano Letters | 2015
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
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
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
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
Viktória Csajbók; Zsolt Bedőházi; Benedek J. Nagy; Péter Dombi
conference on lasers and electro optics | 2016
Jan Vogelsang; Jörg Robin; Benedek J. Nagy; Péter Dombi; Daniel Rosenkranz; Manuela Schiek; Petra Groß; Christoph Lienau
conference on lasers and electro optics | 2016
Jörg Robin; Jan Vogelsang; Benedek J. Nagy; Péter Dombi; Petra Groß; Christoph Lienau
International Conference on Ultrafast Phenomena (2016), paper UTu5A.3 | 2016
Jörg Robin; Jan Vogelsang; Benedek J. Nagy; Péter Dombi; Christoph Lienau; P. Gross
International Conference on Ultrafast Phenomena | 2016
Jan Vogelsang; Jörg Robin; Benedek J. Nagy; Péter Dombi; P. Gross; Christoph Lienau
Archive | 2014
Benedek J. Nagy; Lénárd Vámos; Dániel Oszetzky; Péter Rácz; Péter Dombi