275 citations · 1.4k across the 22 of their papers we have counts for
23 papers
Photoinduced structural dynamics of multiferroic TbMnO
Elsa Abreu, Matteo Savoini, Larissa Boie +17
We use time-resolved hard x-ray diffraction to investigate the structural dynamics of the multiferroic insulator TbMnO in the low temperature antiferromagnetic and ferroelectri…
Microsphere kinematics from the polarization of tightly focused nonseparable light
Stefan Berg-Johansen, Martin Neugebauer, Andrea Aiello +3
Recently, it was shown that vector beams can be utilized for fast kinematic sensing via measurements of their global polarization state [Optica 2(10), 864 (2015)]. The method relie…
Comparison of coherent phonon generation by electronic and ionic Raman scattering in LaAlO
Martin J. Neugebauer, Dominik M. Juraschek, Matteo Savoini +5
In ionic Raman scattering, infrared-active phonons mediate a scattering process that results in the creation or destruction of a Raman-active phonon. This mechanism relies on nonli…
Correlation between electronic and structural orders in 1T-TiSe2
Hiroki Ueda, Michael Porer, José R. L. Mardegan +11
The correlation between electronic and crystal structures of 1T-TiSe2 in the charge density wave (CDW) state is studied by x-ray diffraction. Three families of reflections are used…
Shaping Field Gradients for Nanolocalization
Sergey Nechayev, Jörg S. Eismann, Martin Neugebauer +1
Deep sub-wavelength localization and displacement sensing of optical nanoantennas have emerged as extensively pursued objectives in nanometrology, where focused beams serve as high…
Towards fully integrated photonic displacement sensors
Ankan Bag, Martin Neugebauer, Uwe Mick +3
The field of optical metrology with its high precision position, rotation and wavefront sensors represents the basis for lithography and high resolution microscopy. However, the on…
Spin-Orbit Coupling and the Evolution of Transverse Spin
Jörg S. Eismann, Peter Banzer, Martin Neugebauer
We investigate the evolution of transverse spin in tightly focused circularly polarized beams of light, where spin-orbit coupling causes a local rotation of the polarization ellips…
Huygens' Dipole for Polarization-Controlled Nanoscale Light Routing
Sergey Nechayev, Jörg S. Eismann, Martin Neugebauer +4
Structured illumination allows for satisfying the first Kerker condition of in-phase perpendicular electric and magnetic dipole moments in any isotropic scatterer that supports ele…
Optical control of vibrational coherence triggered by an ultrafast phase transition
M. J. Neugebauer, T. Huber, M. Savoini +13
Femtosecond time-resolved x-ray diffraction is employed to study the dynamics of the periodic lattice distortion (PLD) associated with the charge-density-wave (CDW) in K0.3MoO3. Us…
Experimental demonstration of linear and spinning Janus dipoles for polarisation and wavelength selective near-field coupling
Michela F. Picardi, Martin Neugebauer, Joerg S. Eismann +4
The electromagnetic field scattered by nano-objects contains a broad range of wave vectors and can be efficiently coupled to waveguided modes. The dominant contribution to scatteri…
Constructing a chiral dipolar mode in an achiral nanostructure
Jörg S. Eismann, Martin Neugebauer, Peter Banzer
We discuss the excitation of a chiral dipolar mode in an achiral silicon nanoparticle. In particular, we make use of the electric and magnetic polarizabilities of the silicon nanop…
Ultrafast relaxation dynamics of the antiferrodistortive phase in Ca doped SrTiO3
M. Porer, M. Fechner, E. Bothschafter +19
The ultrafast dynamics of the octahedral rotation in Ca:SrTiO3 is studied by time resolved x-ray diffraction after photo excitation over the band gap. By monitoring the diffraction…
Mirror-Symmetric Heterogeneous Resonant Nanostructures: Extrinsic Chirality and Spin-Polarized Scattering
Sergey Nechayev, Paweł Woźniak, Martin Neugebauer +2
We investigate a geometrically symmetric gold-silicon sphere heterodimer and reveal its extrinsic chiroptical response caused by the interaction with a substrate. The chiroptical r…
Weak measurement of elliptical dipole moments by C point splitting
Sergey Nechayev, Martin Neugebauer, Martin Vorndran +2
We investigate points of circular polarization in the far field of elliptically polarized dipoles and establish a relation between the angular position and helicity of these C poin…
Transverse Kerker Scattering for Angstrom Localization of Nanoparticles
Ankan Bag, Martin Neugebauer, Paweł Woźniak +2
Angstrom precision localization of a single nanoantenna is a crucial step towards advanced nanometrology, medicine and biophysics. Here, we show that single nanoantenna displacemen…
The magnetic and electric transverse spin density of spatially confined light
Martin Neugebauer, Jörg Eismann, Thomas Bauer +1
When a beam of light is laterally confined, its field distribution can exhibit points where the local magnetic and electric field vectors spin in a plane containing the propagation…
Coupling between a charge density wave and magnetism in an Heusler material
G. Lantz, M. J. Neugebauer, M. Kubli +10
The Prototypical magnetic memory shape alloy NiMnGa undergoes various phase transitions as a function of temperature, pressure, and doping. In the low-temperature phases below…
Optical Polarization Möbius Strips and Points of Purely Transverse Spin Density
Thomas Bauer, Martin Neugebauer, Gerd Leuchs +1
Tightly focused light beams can exhibit electric fields spinning around any axis including the one transverse to the beams' propagation direction. At certain focal positions, the c…
Polarization Controlled Directional Scattering for Nanoscopic Position Sensing
Martin Neugebauer, Paweł Woźniak, Ankan Bag +2
Controlling the propagation and coupling of light to sub-wavelength antennas is a crucial prerequisite for many nanoscale optical devices. Recently, the main focus of attention has…
Crystal structure and phonon softening in Ca3Ir4Sn13
D. G. Mazzone, S. Gerber, J. L. Gavilano +14
We investigated the crystal structure and lattice excitations of the ternary intermetallic stannide Ca3Ir4Sn13 using neutron and x-ray scattering techniques. For T > T* ~ 38 K the…
Measuring the Transverse Spin Density of Light
Martin Neugebauer, Thomas Bauer, Andrea Aiello +1
We generate tightly focused optical vector beams whose electric fields spin around an axis transverse to the beams' propagation direction. We experimentally investigate these field…
Geometric spin Hall effect of light in tightly focused polarization tailored light beams
Martin Neugebauer, Peter Banzer, Thomas Bauer +4
Recently, it was shown that a non-zero transverse angular momentum manifests itself in a polarization dependent intensity shift of the barycenter of a paraxial light beam [A. Aiell…
The photonic wheel: demonstration of a state of light with purely transverse angular momentum
Peter Banzer, Martin Neugebauer, Andrea Aiello +4
The concept of angular momentum is ubiquitous to many areas of physics. In classical mechanics, a system may possess an angular momentum which can be either transverse (e.g., in a…