Sebastian Engelbrecht

Institut Franco-Allemand de Recherches de Saint-Louis

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Bernd Fischer

Institut Franco-Allemand de Recherches de Saint-Louis

Bernd Fischer

Institut Franco-Allemand de Recherches de Saint-Louis

Lionel Merlat

Institut Franco-Allemand de Recherches de Saint-Louis

A. Pimenov

TU Wien

A. Shuvaev

TU Wien

Peter Uhd Jepsen

Technical University of Denmark

Kai-Henning Tybussek

University of Duisburg-Essen

Jan C. Balzer

University of Duisburg-Essen

Jérôme Charmet

HES-SO Arc

Youg Du

North Carolina State University

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North Carolina State University

Space Information Laboratories (United States)

Jet Propulsion Laboratory

Chalmers University of Technology

Centre National de la Recherche Scientifique

University of Adelaide

Aalto University

University of Western Australia

Institut Franco-Allemand de Recherches de Saint-Louis

UCLA Health

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IEEE Transactions on Terahertz Science and Technology

IEEE Transactions on Terahertz Science and Technology (2021)

Imran Mehdi Sharri Shaw Frank Maiwald Scott Barker Jessica Afalla

10.1109/tthz.2021.3107173

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Ultrabroadband THz time-domain spectroscopy of biomolecular crystals

Korbinian J. Kaltenecker Sebastian Engelbrecht Krzysztof Iwaszczuk Bernd Fischer Peter Uhd Jepsen

Ultrabroadband THz time-domain spectroscopy based on two-color plasma generation and air biased coherent detection is used for the investigation of molecular dynamics of crystalline materials in the frequency range from 0.3 THz to 20 THz. We show that the spectral features in this extended frequency range are a result of inter- and intramolecular vibrations which are identified by means of simulations of the crystalline materials.

10.1109/irmmw-thz.2016.7758860

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Reconfigurable Terahertz Functions using Phase Change Materials

HAL (Le Centre pour la Communication Scientifique Directe) (2018)

Maxime Pinaud Georges Humbert Bernd Fischer Sebastian Engelbrecht Aurelian Crunteanu

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Through-substrate terahertz time-domain reflection spectroscopy for environmental graphene conductivity mapping

Applied Physics Letters (2020)

Hungyen Lin Oliver J. Burton Sebastian Engelbrecht Kai-Henning Tybussek Bernd Fischer

We demonstrate how terahertz time-domain spectroscopy (THz-TDS) operating in reflection geometry can be used for quantitative conductivity mapping of large area chemical vapor deposited graphene films through silicon support. We validate the technique against measurements performed using the established transmission based THz-TDS. Our through-substrate approach allows unhindered access to the graphene top surface and thus, as we discuss, opens up pathways to perform in situ and in-operando THz-TDS using environmental cells.

Reflection

Surface conductivity

Attenuated total reflection

Terahertz time-domain spectroscopy

10.1063/1.5135644

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Terahertz Devices Using the Optical Activation of GeTe Phase Change Materials: Towards Fully Reconfigurable Functionalities

arXiv (Cornell University) (2021)

Maxime Pinaud Georges Humbert Sebastian Engelbrecht Lionel Merlat Bernd Fischer

We are demonstrating the optical control of a specific state of the germanium telluride (GeTe) phase change material and its integration as control element for realizing extremely efficient optically reconfigurable THz devices. The excellent contrast of the material THz electrical properties in the two dissimilar states were used for optical-induced fast modulation of THz resonances of a hybrid metamaterial based of arrays of split ring resonator metallic structures integrating GeTe patterns. We experimentally confirm for the first time the feasibility to develop all dielectric (metal free) GeTe-based THz polarizers presenting a broadband response, a high extinction ratio when the GeTe is in the metal-like phase (up to 16.5 dB) and almost transparent when the material is in the amorphous phase. The presented highly functional approach based on non-volatile, optically controlled multi-operational THz devices integrating PCMs, is extremely stimulating for generating disruptive developments like field-programmable metasurfaces or all-dielectric coding metamaterials with multifunctional capabilities for THz waves manipulation.

10.48550/arxiv.2103.04395

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Terahertz conductivity in FeSe_0.5Te_0.5superconducting films

New Journal of Physics (2013)

A. Pimenov Sebastian Engelbrecht A. Shuvaev Biaobing Jin Pan Wu

Complex conductivity of FeSe0.5Te0.5 superconducting films has been investigated using backward-wave-oscillator spectroscopy in the terahertz frequency range. The normal state conductivity corresponds well to the low-frequency limit of a Drude metal. In the superconducting state, the real part of the complex conductivity is not completely suppressed, indicating the existence of a strongly anisotropic gap. Weak features in the conductivity are consistent with the superconducting gap value close to 12 cm−1(1.5 meV). The experimental results are discussed within the framework of a two-gap model based on the s± symmetry of the order parameter.

10.1088/1367-2630/15/1/013032

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Time-frequency filtering applied to terahertz time-domain spectroscopy

Mahfoud Drouaz Sebastian Engelbrecht Lionel Merlat Bernd Fischer Bruno Colicchio

We introduce the use of Time-Frequency (TF) filtering applied to Terahertz Time-Domain Spectroscopy (THz-TDS) data in order to extract valuable information hidden into the noise floor. The Short Time Fourier Transform (STFT) provides a spectrum analysis in time, we optimized its Gaussian window in order to analyse and filter the THz signals of substances. The formalism presented allows an efficient denoising of THz-TDS data which could prove useful during the investigation of highly absorbing samples.

Terahertz time-domain spectroscopy

Fourier transform spectroscopy

Window function

10.1109/irmmw-thz.2016.7758581

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Effect of Accelerated Ageing on the Adhesive Properties of Thermoplastic Polyurethane in Polycarbonate - Thermoplastic Polyurethane - Poly Methyl Methacrylate Composites

Vincent Pichot Nicolas Montmasson A. Bracq Thomas Goepfert Célia Bruder

Thermoplastic polyurethane

Polycarbonate

Poly(N-isopropylacrylamide)

10.2139/ssrn.5133696

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Chemometrics applied to terahertz and Raman spectra for explosives analysis

Joyce Bou Sleiman Sebastian Engelbrecht Lionel Merlat Bernd Fischer Bruno Bousquet

Explosives detection has been performed in terahertz and Raman frequency bands using chemometric tools. We applied principal component models to compare the performances of terahertz and Raman spectra in explosives analysis, as well as binary and ternary explosive mixtures.

Chemometrics

Explosive detection

10.1109/irmmw-thz.2016.7758801

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Reconfigurable Terahertz Devices Using the Optical Activation of GeTe Phase Change Materials

arXiv (Cornell University) (2021)

Maxime Pinaud Georges Humbert Sebastian Engelbrecht Lionel Merlat Bernd Fischer

Polarizer

Extinction ratio

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