R. Leonhardt
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View article: Phase-Shifted Bell States
Phase-Shifted Bell States Open
Inspired by previous studies and pioneers of the field, we present new results on an extensive EPR-Bell experiment using photons generated by parametric down conversion, where one of the photons is deliberately phase-shifted. Our experimen…
View article: Microresonator Frequency Reference for Terahertz Precision Sensing and Metrology
Microresonator Frequency Reference for Terahertz Precision Sensing and Metrology Open
Highly sensitive terahertz (THz) sensors for a myriad of applications are rapidly evolving. A widespread sensor concept is based on the detection of minute resonance frequency shifts due to a targeted specimen in the sensors environment. T…
View article: Microresonator frequency reference for terahertz precision sensing and\n metrology
Microresonator frequency reference for terahertz precision sensing and\n metrology Open
Highly sensitive terahertz (THz) sensors for a myriad of applications are\nrapidly evolving. A widespread sensor concept is based on the detection of\nminute resonance frequency shifts due to a targeted specimen in the sensors\nenvironment…
View article: Terahertz Gas-Phase Spectroscopy Using a Sub-Wavelength Thick Ultrahigh-Q Microresonator
Terahertz Gas-Phase Spectroscopy Using a Sub-Wavelength Thick Ultrahigh-Q Microresonator Open
The terahertz spectrum provides tremendous opportunities for broadband gas-phase spectroscopy, as numerous molecules exhibit strong fundamental resonances in the THz frequency range. However, cutting-edge THz gas-phase spectrometer require…
View article: Synthesis and Characterisation of Hierarchically Structured Titanium Silicalite‐1 Zeolites with Large Intracrystalline Macropores
Synthesis and Characterisation of Hierarchically Structured Titanium Silicalite‐1 Zeolites with Large Intracrystalline Macropores Open
The successful synthesis of hierarchically structured titanium silicalite‐1 (TS‐1) with large intracrystalline macropores by steam‐assisted crystallisation of mesoporous silica particles is reported. The macropore topology was imaged in 3D…
View article: Focusing of multi-MeV, subnanosecond proton bunches from a laser-driven source
Focusing of multi-MeV, subnanosecond proton bunches from a laser-driven source Open
We report on our latest transverse focusing results of subnanosecond proton bunches achieved with a laser-driven multi-MeV ion beamline. In the frame of the LIGHT collaboration, a target normal sheath acceleration (TNSA) source based 6 m l…
View article: Prism coupling of high-Q terahertz whispering-gallery-modes over two octaves from 02 THz to 11 THz
Prism coupling of high-Q terahertz whispering-gallery-modes over two octaves from 02 THz to 11 THz Open
We report on prism coupling of high-quality (high-Q) terahertz (THz) whispering-gallery modes (WGMs) in spherical high resistivity float zone grown silicon (HRFZ-Si) resonators over two octaves from 0.2 THz to 1.1 THz. The WGMs are excited…
View article: Ultra-high Q terahertz whispering-gallery modes in a silicon resonator
Ultra-high Q terahertz whispering-gallery modes in a silicon resonator Open
We report on the first experimental demonstration of terahertz (THz) whispering-gallery modes (WGMs) with an ultra-high quality factor of 1.5 × 104 at 0.62 THz. The WGMs are observed in a high resistivity float zone silicon spherical reson…
View article: High resolution terahertz spectroscopy of a whispering gallery mode bubble resonator using Hilbert analysis
High resolution terahertz spectroscopy of a whispering gallery mode bubble resonator using Hilbert analysis Open
We report on data processing for continuous wave (CW) terahertz (THz) spectroscopy measurements based on a Hilbert spectral analysis to achieve MHz resolution. As an example we investigate the spectral properties of a whispering gallery mo…
View article: Low Loss and Low Dispersion Fiber for Transmission Applications in the Terahertz Regime
Low Loss and Low Dispersion Fiber for Transmission Applications in the Terahertz Regime Open
In this letter, we present a novel slotted core fiber incorporating a slotted cladding for the terahertz band. The modal properties of the designed fiber are numerically investigated based on an efficient finite element method. Simulation …
View article: Metallic and 3D-printed dielectric helical terahertz waveguides
Metallic and 3D-printed dielectric helical terahertz waveguides Open
We investigate guidance of Terahertz (THz) radiation in metallic and 3D-printed dielectric helical waveguides in the frequency range from 0.2 to 1 THz. Our experimental results obtained from THz time-domain spectroscopy (THz-TDS) measureme…