Daniel Molter
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Simultaneous charge carrier density mapping of SiC epilayers and substrates with terahertz time-domain spectroscopy Open
With the growing demand for efficient power electronics, SiC-based devices are progressively becoming more relevant. In contrast to established methods such as the mercury capacitance-voltage technique, terahertz spectroscopy promises a co…
View article: Ultrafast Electron Temperature Dynamics in Spintronic Terahertz Emitters Studied by Optical-Pump Terahertz-Probe Spectroscopy
Ultrafast Electron Temperature Dynamics in Spintronic Terahertz Emitters Studied by Optical-Pump Terahertz-Probe Spectroscopy Open
Spintronic terahertz emitters (STEs) pumped by femtosecond lasers have become a widely used source of broadband terahertz radiation. However, the strength of the emitted field is limited in part by the optical damage threshold at the pump …
Simultaneous Charge Carrier Density Mapping of SiC Epilayers and Substrates with Terahertz Time-Domain Spectroscopy Open
With the growing demand for efficient power electronics, SiC-based devices are progressively becoming more relevant. In contrast to established methods such as the mercury capacitance-voltage technique, terahertz spectroscopy promises a co…
Terahertz Quantum Imaging Open
Quantum imaging offers a powerful method for spatially transferring amplitude and phase information between spectral regions of interest, even when separated by several orders of magnitude in photon energy. However, so far demonstrations h…
Terahertz Quantum Imaging Open
Quantum imaging offers a powerful method for spatially transferring amplitude and phase information between spectral regions of interest, even when separated by several orders of magnitude in photon energy. However, so far demonstrations h…
View article: Terahertz-induced nonlinear response in ZnTe
Terahertz-induced nonlinear response in ZnTe Open
Measuring terahertz waveforms in terahertz spectroscopy often relies on electro-optic sampling employing a ZnTe crystal. Although the nonlinearities in such zincblende semiconductors induced by intense terahertz pulses have been studied at…
View article: Terahertz-Induced Nonlinear Response in ZnTe
Terahertz-Induced Nonlinear Response in ZnTe Open
Measuring terahertz waveforms in terahertz spectroscopy often relies on electrooptic sampling employing a ZnTe crystal. Although the nonlinearities in such zincblende semiconductors induced by intense terahertz pulses have been studied at …
View article: Optical damage thresholds of single-mode fiber-tip spintronic terahertz emitters
Optical damage thresholds of single-mode fiber-tip spintronic terahertz emitters Open
Spintronic terahertz emitters (STEs) are gapless, ultrabroadband terahertz sources that can be driven within a wide pump-wavelength and repetition-rate range. While STEs driven by strong pump lasers operating at kilohertz repetition rates …
View article: Optical damage thresholds of single-mode fiber-tip spintronic terahertz emitters
Optical damage thresholds of single-mode fiber-tip spintronic terahertz emitters Open
Spintronic terahertz emitters (STEs) are gapless, ultrabroadband terahertz sources that can be driven within a wide pump-wavelength and repetition-rate range. While STEs driven by strong pump lasers operating at kilohertz repetition rates …
View article: Optical damage thresholds of single-mode fiber-tip spintronic terahertz emitters
Optical damage thresholds of single-mode fiber-tip spintronic terahertz emitters Open
Spintronic terahertz emitters (STEs) are gapless, ultrabroadband terahertz sources that can be driven within a wide pump-wavelength and repetition-rate range. While STEs driven by strong pump lasers operating at kilohertz repetition rates …
View article: Optical damage thresholds of single-mode fiber-tip spintronic terahertz emitters
Optical damage thresholds of single-mode fiber-tip spintronic terahertz emitters Open
Spintronic terahertz emitters (STEs) are gapless, ultrabroadband terahertz sources that can be driven within a wide pump-wavelength and repetition-rate range. While STEs driven by strong pump lasers operating at kilohertz repetition rates …
Wide-range resistivity characterization of semiconductors with terahertz time-domain spectroscopy Open
Resistivity is one of the most important characteristics in the semiconductor industry. The most common way to measure resistivity is the four-point probe method, which requires physical contact with the material under test. Terahertz time…
Wide-range resistivity characterization of semiconductors with terahertz time-domain spectroscopy Open
Resistivity is one of the most important characteristics in the semiconductor industry. The most common way to measure resistivity is the four-point probe method, which requires physical contact with the material under test. Terahertz time…
View article: Fiber-tip spintronic terahertz emitters
Fiber-tip spintronic terahertz emitters Open
Spintronic terahertz emitters promise terahertz sources with an unmatched broad frequency bandwidth that are easy to fabricate and operate, and therefore easy to scale at low cost. However, current experiments and proofs of concept rely on…
View article: Fiber-tip spintronic terahertz emitters
Fiber-tip spintronic terahertz emitters Open
Spintronic terahertz emitters promise terahertz sources with an unmatched broad frequency bandwidth that are easy to fabricate and operate, and therefore easy to scale at low cost. However, current experiments and proofs of concept rely on…
General simulation method for spontaneous parametric down- and parametric up-conversion experiments Open
Spontaneous parametric down-conversion (SPDC) sources are an important technology for quantum sensing and imaging. We demonstrate a general simulation method, based on modeling from first principles, reproducing the spectrally and spatiall…
Phase-quadrature quantum imaging with undetected photons Open
Sensing with undetected photons allows access to spectral regions with simultaneous detection of photons of another region and is based on nonlinear interferometry. To obtain the full information of a sample, the corresponding interferogra…
Report on scipost_202203_00008v1 Open
Spontaneous parametric down-conversion (SPDC) sources are an important technologyfor quantum sensing and imaging.We demonstrate a general simulation method, based on modeling from first principles, reproducing the spectrally and spatially …
View article: Electronic phase detection with a sub-10 fs timing jitter for terahertz time-domain spectroscopy systems
Electronic phase detection with a sub-10 fs timing jitter for terahertz time-domain spectroscopy systems Open
Terahertz time-domain spectroscopy systems based on resonator-internal repetition-rate modulation, such as SLAPCOPS and ECOPS, rely on electronic phase detectors which are typically prone to exhibit both a non-negligible random and systema…
Phase-quadrature quantum imaging with undetected photons Open
Sensing with undetected photons allows access to spectral regions with simultaneous detection of photons of another region and is based on nonlinear interferometry. To obtain the full information of a sample, the corresponding interferogra…
View article: Electronic Phase Detection with sub-10 fs Timing Jitter for Terahertz Time-Domain Spectroscopy Systems
Electronic Phase Detection with sub-10 fs Timing Jitter for Terahertz Time-Domain Spectroscopy Systems Open
Terahertz time-domain spectroscopy systems based on resonator-internal repetition-rate modulation, such as SLAPCOPS [12] and ECOPS [11], rely on electronic phase detectors which are typically prone to exhibit both a non-negligible random a…
Front Cover: Quantum Sensing with Extreme Light (Adv. Quantum Technol. 6/2022) Open
Quantum sensing provides access to photon properties in spectral ranges classically hard to address. As demonstrated by Mirco Kutas, Björn Erik Haase, Felix Riexinger, and colleagues in article number 2100164, this allows to combine the be…
Kilohertz Pixel-Rate Multilayer Terahertz Imaging of Subwavelength Coatings Open
The acquisition speed of terahertz time-domain spectroscopy systems has undergone a significant improvement in recent years. With the development of dual-laser-based sampling techniques such as ASOPS or ECOPS, waveform acquisition rates in…
Phase-sensitive terahertz upconversion detection Open
Nonlinear frequency conversion provides an elegant method to detect photons in a spectral range which differs from the pump wavelength, making it highly attractive for photons with inherently low energy. Aside from the intensity of the lig…
Quantum Sensing with Extreme Light Open
Optical nonlinear conversion processes are ubiquitously applied to scientific as well as industrial tasks. In particular, nonlinear processes are employed to generate radiation in many frequency ranges. In plenty of these nonlinear process…
Sample thickness measurements by phase-sensitive terahertz upconversion detection Open
Nonlinear frequency conversion provides an elegant method to detect photons in a spectral range which differs from the pump wavelength, making it highly attractive for photons with inherently low energy. Aside from the intensity of the lig…
Spontaneous parametric down-conversion of photons at 660 nm to the terahertz and sub-terahertz frequency range: erratum Open
In this erratum, we correct two typing errors from our previously published manuscript [ Opt. Express 27 , 7458 ( 2019 ) 10.1364/OE.27.007458 ]. In the original manuscript, the two errors were limited to the theoretical derivation and did …
General simulation method for spontaneous parametric down- and parametric up-conversion experiments Open
Spontaneous parametric down-conversion (SPDC) sources are an important technology for quantum sensing and imaging. We demonstrate a general simulation method, based on modeling from first principles, reproducing the spectrally and spatiall…
Two decades of terahertz cross-correlation spectroscopy Open
Terahertz cross-correlation spectroscopy enables phase-sensitive measurements without the need for a laser source and, hence, presents a cost-efficient and versatile alternative to common terahertz time-domain spectroscopy approaches. This…
Quantum-inspired terahertz spectroscopy with visible photons Open
Terahertz technology offers solutions in nondestructive testing and spectroscopy for many scientific and industrial applications. While direct detection of photons in this frequency range is difficult to achieve, quantum optics provides a …