233 citations · 1.3k across the 39 of their papers we have counts for
12 papers · 1 filter
Twin Domains in Van der Waals Quaternary Oxides
Dorothée S. Mader, Niels Brumby, Xiaosheng Yang +10
Optical anisotropy is the basis for many intriguing phenomena in van der Waals materials, including hyperbolic polaritons and extreme birefringence. Stacking and twisting van der W…
Tailoring phonon-driven responses in α-MoO3 through isotopic enrichment
Thiago S. Arnaud, Ryan W. Spangler, Johnathan D. Georgaras +29
The implementation of polaritonic materials into nanoscale devices requires selective tuning of parameters to realize desired spectral or thermal responses. One robust material is…
Full Crystallographic Imaging of Hexagonal Boron Nitride Monolayers with Phonon-Enhanced Sum-Frequency Microscopy
Niclas S. Mueller, Alexander P. Fellows, Ben John +13
Hexagonal boron nitride (hBN) is an important 2D material for van der Waals heterostructures, single photon emitters, and infrared nanophotonics. The optical characterization of mo…
Roadmap for Photonics with 2D Materials
F. Javier García de Abajo, D. N. Basov, Frank H. L. Koppens +145
Triggered by the development of exfoliation and the identification of a wide range of extraordinary physical properties in self-standing films consisting of one or few atomic layer…
Spectral narrowing of a phonon resonance in time-domain sum-frequency spectroscopy
Riko Kiessling, Martin Wolf, Alexander Paarmann
Sum-frequency generation (SFG) spectroscopy provides a versatile method for the investigation of non-centrosymmetric media and interfaces. Here, using tunable picosecond infrared (…
Low-temperature infrared dielectric function of hyperbolic -quartz
Christopher J. Winta, Martin Wolf, Alexander Paarmann
We report the infrared dielectric properties of -quartz in the temperature range from to . Using an infrared free-electron laser, far-infrared…
Controlling the Infrared Dielectric Function through Atomic-Scale Heterostructures
Daniel C. Ratchford, Christopher J. Winta, Ioannis Chatzakis +20
Surface phonon polaritons (SPhPs) - the surface-bound electromagnetic modes of a polar material resulting from the coupling of light with optic phonons - offer immense technologica…
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…
Dissecting spin-phonon equilibration in ferrimagnetic insulators by ultrafast lattice excitation
Sebastian F. Maehrlein, Ilie Radu, Pablo Maldonado +8
To gain control over magnetic order on ultrafast time scales, a fundamental understanding of the way electron spins interact with the surrounding crystal lattice is required. Howev…
Second-harmonic phonon spectroscopy of -quartz
Christopher J. Winta, Sandy Gewinner, Wieland Schöllkopf +2
We demonstrate midinfrared second-harmonic generation as a highly sensitive phonon spectroscopy technique that we exemplify using -quartz (SiO) as a model system. A midinfra…
Terahertz sum-frequency excitation of a Raman-active phonon
Sebastian Maehrlein, Alexander Paarmann, Martin Wolf +1
In stimulated Raman scattering, two incident optical waves induce a force oscillating at the difference of the two light frequencies. This process has enabled important application…
Effects of Crystal Anisotropy on Optical Phonon Resonances in the Mid-Infrared Second Harmonic Response of SiC
Alexander Paarmann, Ilya Razdolski, Sandy Gewinner +2
We study the effects of crystal anisotropy on optical phonon resonances in the second harmonic generation (SHG) from silicon carbide (SiC) in its Reststrahl region. By comparing ex…