6 article(s) from Boneberg, Johannes
- Full Research Paper
- Published 30 May 2016
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Figure 1: a) Schematics of the MCBJ mechanism. The sample is represented as the orange line and the junction ...
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Figure 2: Optical setup: An Ar-Kr laser serves as cw laser source at a wavelength of λ = 514 nm and the beam ...
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Figure 3: Conductance histogram at 77 K of 220 opening and closing curves recorded with an applied voltage of...
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Figure 4: A schematic sketch of the measurement circuits. a) The main circuit where the current I is measured...
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Figure 5: Measurement methodology of the main circuit for Au atomic-contacts at 77 K. a) Raw data of V versus...
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Figure 6: a) Raw data of VSens versus time at different applied currents, while the laser is pulsing on the s...
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Figure 7: Simulations of the temperature distribution generated by a Gaussian heat source of 1.5 mW and with ...
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Figure 8: Time-dependent simulation of the resistivity of the two sensor leads due to heating. After 4 ms the...
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Figure 9: Thermopower S(G) versus conductance G of individual contacts, calculated from the ∆V(G) data shown ...
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Figure 10: Reflected intensity versus the position of the laser spot across the 36 µm wide gold stripe. The sp...
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Figure 11: Colored scanning electron micrograph of the sample shown in Figure 2, recorded after the measurements under...
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- Full Research Paper
- Published 30 Sep 2013
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Figure 1: Optical set-up. The sample is mounted on an x–y micrometer stage and can be moved reversibly below ...
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Figure 2: (a) Laser profile at the sample position taken with a CCD camera. Next to the central maximum the f...
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Figure 3: Scanning electron micrographs of different types of triangles used in the course of this work. The ...
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Figure 4: AFM image of a colloid lithography triangle. (a) Top view; (b) 3D image.
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Figure 5: Upper left: Fluence distribution along the laser spot radius as described in the Experimental secti...
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Figure 6: (a) Calculated field intensity enhancement, (b) dissipation, and (c) field distribution for a nanot...
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Figure 7: (a) AFM image of a Si surface with ablation holes, generated by irradiation of colloid lithography ...
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Figure 8: Hole depth (as determined from profiles such as in Figure 7b, measured with respect to the height of the fla...
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Figure 9: AFM image and height profile of an ablation hole generated by far-field ablation of bare Si (same w...
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Figure 10: Depth of holes in Si, generated by far-field ablation, as a function of the peak fluence.
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Figure 11: SEM micrographs of two different types of nanotriangles prepared by electron beam lithography, and ...
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Figure 12: FDTD calculations for the structures presented in Figure 11. The field intensity enhancement was extracted i...
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Figure 13: (a) SEM micrograph and (b) calculated field distribution for the center region of a bow-tie antenna...
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Figure 14: Evolution of laser-molten gold triangles (thickness: 40 nm, side length: 530 nm, prepared by colloi...
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Figure 15: (a) SEM micrograph of colloid lithography nanotriangles irradiated with a 300 ps laser pulse (wavel...
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Figure 16: Molten volume at the triangle tips vs local laser fluence.
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Figure 17: SEM micrographs of a 40 nm Au film on Si, after exposition to a 300 ps laser pulse at 800 nm wavele...
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- Full Research Paper
- Published 14 May 2013
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Figure 1: CVR chamber consisting of precursor sources, reaction zone and thermophoretic powder-collection sys...
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Figure 2: X-ray diffraction patterns (Cu Kα radiation) from the TiO2:Eu nanophosphors produced by the CVR met...
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Figure 3: Normalized emission spectra of Eu3+ in TiO2 under excitation at 330 or 390 nm.
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Figure 4: Excitation spectrum of TiO2:Eu nanoparticles detected at 617 nm emission.
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Figure 5: Decay of the TiO2:Eu emission intensity with time for excitation at 330 nm.
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Figure 6: Decay of the TiO2:Eu emission intensity at 617 nm with time for excitation at 460 nm.
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Figure 7: STEM image of TiO2:Eu nanoparticles coated with a shell of 3 nm Al2O3 and TiO2.
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Figure 8: High-resolution TEM image of TiO2 nanoparticles coated with Al2O3 showing that the Al2O3 coating is...
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Figure 9: SEM image of Ag nanoantennas from the nanosphere lithography process (using colloid spheres with 3 ...
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Figure 10: Confocal microscopy images of the Ag nano-antenna structures (produced using 3 μm diameter colloid ...
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Figure 11: Calculated field-enhancement factor (normalized to the amplitude E0 of the incident light) for bowt...
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Figure 12: Field enhancement ratio (scale goes from 0 to 90) for Ag bow-tie nano-antennas with tip-to-edge len...
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Figure 13: Dependence of the field enhancement in the centre of the gap of a bowtie antenna structure on the i...
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Figure 14: Field enhancement ratio for an array of Ag nanoantenna structures with tip-to-edge length of 370 nm...
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Figure 15: SEM image of spin coated TiO2:Eu layer on Ag nanoantenna structures.
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Figure 16: (a) AFM image of the spin coated TiO2:Eu layer. The antenna structure is still visible in this regi...
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Figure 17: Fluorescent intensity obtained by confocal microscopy of spin-coated nanoantenna structures under e...
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Figure 18: Emission spectrum of VTLUNP organic pigment under excitation with 532 nm radiation.
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Figure 19: Excitation spectrum of VTLUNP organic pigment for emission at 614 nm.
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Figure 20: (a) AFM image of Ag nanoantennas spin coated with VTLUNP (b) AFM height profiles along the lines 1 ...
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Figure 21: Representative scattering (a, c) and fluorescence (b, d) images of the samples spin coated with VTL...
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Figure 22: Representative fluorescence images (recorded at 614 nm) of samples without SiOx layer (a, b) and sa...
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- Full Research Paper
- Published 07 Dec 2012
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Figure 1: Principle of percolated perpendicular media. The exchange-coupled film is interspersed by nonmagnet...
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Figure 2: Schematics of the sample preparation. Self-assembled, close-packed monolayers of PS spheres are dep...
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Figure 3: Size reduction of PS spheres as a function of etching time in isotropic oxygen plasma at ambient te...
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Figure 4: SEM images of monolayer assemblies of commercial Au nanoparticles with (a) 60 nm diameter and (b) 4...
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Figure 5: (a) Magnetic hysteresis loops of a percolated Fe film (a = 95 nm, d = 66 nm, t = 17 nm) and a thin-...
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Figure 6: (a) Scanning transmission X-ray microscopy images of Fe films taken with right circularly polarized...
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Figure 7: (a–i) MFM images of the same spot taken in different perpendicular fields after driving the sample ...
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Figure 8: (a) DF-STEM image of 40 nm Au nanoparticles capped with a magnetic Co/Pt multilayer. Panel (b) show...
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Figure 9: (a) MOKE remanence curves for Co/Pt multilayers grown on a planar substrate as well as on arrays of...
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Revealing thermal effects in the electronic transport through irradiated atomic metal point contacts
- Full Research Paper
- Published 24 Oct 2012
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Figure 1: SEM image of the Au electrodes; the gap between the two segments, distinguishable by the border of ...
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Figure 2: (a) Red: Light-induced signal of a gold electrode under illumination (see Figure 1) in an electrochemical e...
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Figure 3: Spatial dependence of the light-induced signal (see Figure 2a) for the two working electrodes. The probed ar...
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Figure 4: Cyclic voltammogram of AgNO3 under illumination. Twelve insets of zoomed areas at different potenti...
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Figure 5: Cyclic voltammogram (CV) of AgNO3 at 35 °C (black) and 45 °C (red), scan rate was 50 mV/s. The temp...
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Figure 6: (a) Optical microscope picture of a MCBJ before electrochemical deposition of Ag (bright-field illu...
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Figure 7: (a) Light-induced signal (red) of a dry, electrochemically closed break junction, and the laser pul...
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Figure 8: (a) Illustration of the closed contact; a silver crystallite spans the bridge across the gap betwee...
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Figure 9: (a) Voltage change during the laser pulse at an Au–Ag–Au junction versus time for different bias cu...
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Figure 10: Sketch of the optical setup used for the experiments on the “dry” contacts.
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Figure 11: Sketch of the electronic circuit used for the measurements on the electrochemically controlled cont...
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Figure 12: Sketch of the electrical circuit used for the measurements on the “dry” contacts.
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Figure 13: Diagram of an electrochemical cell used for studying the influence of laser illumination on the cha...
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- Full Research Paper
- Published 04 Oct 2012
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Figure 1: Focusing higher order laser modes with a parabolic mirror. (a) A sketch illustrating how a radial m...
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Figure 2: SEM images of gold triangle arrays on silicon substrates which are fabricated using polystyrene sph...
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Figure 3: Confocal luminescence images of gold Fischer patterns on a silicon substrate. The images were recor...
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Figure 4: Confocal luminescence patterns of gold nano-triangles on silicon excited by an azimuthally polarise...
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Figure 5: Confocal luminescence patterns of gold nano-triangles on glass excited by a radially polarised lase...
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Figure 6: Confocal luminescence patterns of gold nano-triangles on glass excited by an azimuthally polarised ...
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Figure 7: Calculated convolution of the intensity distribution in the azimuthal laser focus (upper row) and r...
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Figure 8: Surface-enhanced Raman spectra of an adenine (sub-)monolayer on gold Fisher patterns on glass. The ...
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