Daniel Issenmann

Karlsruhe Institute of Technology

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Anton Plech

Karlsruhe Institute of Technology

Shyjumon Ibrahimkutty

Max Planck Institute for Solid State Research

T. Dekorsy

Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)

S. Eon

University of Münster

H. Bracht

University of Münster

Tilo Baumbach

Karlsruhe Institute of Technology

A. Bruchhausen

Bariloche Atomic Centre

Elke Scheer

University of Konstanz

Nadine Wehmeier

Institut für Solarenergieforschung

Artur Erbe

Helmholtz-Zentrum Dresden-Rossendorf

Cooperative Institutions

University of Konstanz

Karlsruhe Institute of Technology

University of Münster

Centre National de la Recherche Scientifique

University of California, Berkeley

Deutsches Elektronen-Synchrotron DESY

Lawrence Berkeley National Laboratory

Ludwig-Maximilians-Universität München

Bariloche Atomic Centre

Balseiro Institute

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Reduced thermal conductivity of isotopically modulated silicon multilayer structures

Applied Physics Letters (2012)

H. Bracht Nadine Wehmeier S. Eon Anton Plech Daniel Issenmann

We report measurements of the thermal conductivity of isotopically modulated silicon that consists of alternating layers of highly enriched silicon-28 and silicon-29. A reduced thermal conductivity of the isotopically modulated silicon compared to natural silicon was measured by means of time-resolved x-ray scattering. Comparison of the experimental results to numerical solutions of the corresponding heat diffusion equations reveals a factor of three lower thermal conductivity of the isotope structure compared to natural Si. Our results demonstrate that the thermal conductivity of silicon can be effectively reduced with isotopically modulated structures. This offers a promising approach to optimize silicon for thermoelectric applications.

10.1063/1.4742922

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Citations (18)

Lattice Dynamics of Laser Excited Ferroelectric BaTiO₃

Acta Physica Polonica A (2012)

Daniel Issenmann Stefan Schleef Shyjumon Ibrahimkutty Gernot Buth Tilo Baumbach

We investigated the lattice dynamics of the prototypic ferroelectric barium titanate close to its ferroelectric--paraelectric phase transition aiming at a better understanding of the atomistic nature of the transition.The usage of time-resolved X-ray techniques allows to disentangle lattice motion and unit cell changes, which, in part, relate to the ferroelectric polarization.In the quasi-static case both the electrical and the laser excitation show a mean-field, simple thermal behaviour, while for time scales shorter than nanoseconds the impulsive nature of the excitation becomes visible.

Lattice (music)

10.12693/aphyspola.121.319

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Structural study of near-field ablation close to plasmon-resonant nanotriangles

Journal of Laser Applications (2012)

Andreas Kolloch P. Leǐderer Shyjumon Ibrahimkutty Daniel Issenmann Anton Plech

The optical near fields in close vicinity to plasmonic nanoscale objects show a considerable enhancement of the electrical field and are localized to dimensions much less than the wavelength of light. The authors show that an ablation process caused by the near-field enhancement of femtosecond laser pulses pattern the substrate below gold nanotriangles is a way to image the near-field distribution with a resolution below 20 nm. The mechanism of ablation studied by pulsed x-ray scattering reveals the nonthermal nature of the process.

Laser Ablation

10.2351/1.4731304

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Citations (6)

Studium der Phononendynamik mit Pump-Probe-Experimenten im Röntgenbereich

Daniel Issenmann

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Confined longitudinal acoustic phonon modes in free-standing Si membranes coherently excited by femtosecond laser pulses

Physical Review B (2009)

F. Hudert A. Bruchhausen Daniel Issenmann Olivier Schecker Reimar Waitz

In this Rapid Communication we report the first time-resolved measurements of confined acoustic phonon modes in free-standing Si membranes excited by fs laser pulses. Pump-probe experiments using asynchronous optical sampling reveal the impulsive excitation of discrete acoustic modes up to the 19th harmonic order for membranes of two different thicknesses. The modulation of the membrane thickness is measured with fm resolution. The experimental results are compared with a theoretical model including the electronic deformation potential and thermal stress for the generation mechanism. The detection is modeled by the photoelastic effect and the thickness modulation of the membrane, which is shown to dominate the detection process. The lifetime of the acoustic modes is found to be at least a factor of 4 larger than that expected for bulk Si.

Modulation (music)

10.1103/physrevb.79.201307

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Citations (48)

Subharmonic Resonant Optical Excitation of Confined Acoustic Modes in a Free-Standing Semiconductor Membrane at GHz Frequencies with a High-Repetition-Rate Femtosecond Laser

Physical Review Letters (2011)

A. Bruchhausen R. Gebs F. Hudert Daniel Issenmann G. Klatt

We propose subharmonic resonant optical excitation with femtosecond lasers as a new method for the characterization of phononic and nanomechanical systems in the gigahertz to terahertz frequency range. This method is applied for the investigation of confined acoustic modes in a free-standing semiconductor membrane. By tuning the repetition rate of a femtosecond laser through a subharmonic of a mechanical resonance we amplify the mechanical amplitude, directly measure the linewidth with megahertz resolution, infer the lifetime of the coherently excited vibrational states, accurately determine the system's quality factor, and determine the amplitude of the mechanical motion with femtometer resolution.

Laser linewidth

Mechanical Resonance

10.1103/physrevlett.106.077401

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Citations (68)

Ultrafast study of phonon transport in isotopically controlled semiconductor nanostructures

physica status solidi (a) (2015)

Daniel Issenmann S. Eon H. Bracht Mike Hettich T. Dekorsy

Abstract Isotopically modulated silicon and germanium multilayers are analyzed by means of femtosecond spectroscopy and pulsed X‐ray scattering for determining thermal conductivity and phonon modes. Isotopic modulation decreases thermal conductivity stronger than expected from a band bending model in the coherent phonon transport regime, in particular for silicon. Femtosecond spectroscopy and X‐ray scattering resolve zone‐folded vibration modes, which are located at the edge of the new, smaller Brillouin zone due to the multilayer periodicity. These modes can contribute to the reduction of thermal conductivity by Umklapp processes within the zone‐folded mini‐bands. Color‐coded increase in ultrafast X‐ray scattering in vicinity to the mini‐zone boundary of a germanium multilayer.

Brillouin zone

Phonon scattering

10.1002/pssa.201532462

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Citations (8)

Ultrafast laser pump X-ray probe experiments by means of asynchronous sampling

Journal of Physics Conference Series (2013)

Daniel Issenmann Shyjumon Ibrahimkutty Ralph Steininger Jörg Göttlicher Tilo Baumbach

A high time resolution in the picosecond range is required for the time-domain investigation of phonon dynamics in crystalline systems. Following a recently developed scheme in the visible spectrum, this resolution can be achieved by a method called asynchronous optical x-ray sampling (ASOXS). A pulsed femtosecond laser with high repetition rate is synchronized to the electron bunches in a storage ring. A slight frequency detuning changes the mutual delay continuously, resulting in a time-domain x-ray sampling of the laser-excited system. At the synchrotron radiation source ANKA a machine mode with low momentum compaction factor αc is available, which delivers ultra-short x-ray pulses in the picosecond range.

Picosecond

Temporal resolution

10.1088/1742-6596/425/9/092007

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Asynchronous sampling for ultrafast experiments with low momentum compaction at the ANKA ring

Journal of Synchrotron Radiation (2011)

Shyjumon Ibrahimkutty Daniel Issenmann Stefan Schleef Anke-Susanne Müller Yves-Laurent Mathis

A high-repetition-rate pump-probe experiment is presented, based on the asynchronous sampling approach. The low-α mode at the synchrotron ANKA can be used for a time resolution down to the picosecond limit for the time-domain sampling of the coherent THz emission as well as for hard X-ray pump-probe experiments, which probe structural dynamics in the condensed phase. It is shown that a synchronization of better than 1 ps is achieved, and examples of phonon dynamics of semiconductors are presented.

Picosecond

Momentum (technical analysis)

Frame rate

10.1107/s0909049511018267

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Modification of coherent acoustic phonon lifetimes in thin gold films by self-assembled molecular monolayers

Mike Hettich A. Bruchhausen Stephen Riedel Simon Verleger T. Geldhauser

We report on the modification of coherent acoustic phonon lifetimes in thin gold films induced by insertion of self-assembled monolayers as interface layers between gold films and substrates.

Self-assembled monolayer

10.1109/cleoe.2011.5943000

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Citations (1)