A5028158973- Thermal Radiation and Cooling Technologies
- Terahertz technology and applications
- Photonic and Optical Devices
- Mechanical and Optical Resonators
- Ga2O3 and related materials
- Strong Light-Matter Interactions
- Semiconductor Quantum Structures and Devices
- Plasmonic and Surface Plasmon Research
- Quantum and electron transport phenomena
- Silicon Nanostructures and Photoluminescence
- Near-Field Optical Microscopy
- Nanowire Synthesis and Applications
- Surface and Thin Film Phenomena
Technische Universität Dresden
2020-2024
Complexity and Topology in Quantum Matter
2023-2024
Abstract Electromagnetic field confinement is crucial for nanophotonic technologies, since it allows enhancing light–matter interactions, thus enabling light manipulation in deep sub‐wavelength scales. In the terahertz (THz) spectral range, radiation conventionally achieved with specially designed metallic structures—such as antennas or nanoslits—with large footprints due to rather long wavelengths of THz radiation. this context, phonon polaritons—light coupled lattice vibrations—in van der...
Structural anisotropy in crystals is crucial for controlling light propagation, particularly the infrared spectral regime where optical frequencies overlap with crystalline lattice resonances, enabling light-matter coupled quasiparticles called phonon polaritons (PhPs). Exploring PhPs anisotropic materials like hBN and MoO3 has led to advancements confinement manipulation. In a recent study, monoclinic crystal β-Ga2O3 (bGO) were shown exhibit strongly asymmetric propagation frequency...
Terahertz (THz) electromagnetic radiation is key to access collective excitations such as magnons (spins), plasmons (electrons), or phonons (atomic vibrations), thus bridging topics between optics and solid-state physics. Confinement of THz light the nanometer length scale desirable for local probing in low-dimensional systems, thereby circumventing large footprint inherently low spectral power density far-field radiation. For that purpose, phonon polaritons (PhPs) anisotropic van der Waals...
The terahertz (THz) frequency range is key to studying collective excitations in many crystals and organic molecules. However, due the large wavelength of THz radiation, local probing these smaller crystalline structures or few-molecule arrangements requires sophisticated methods confine light down nanometer length scale, as well manipulate such a confined radiation. For this purpose, recent years, taking advantage hyperbolic phonon polaritons (HPhPs) highly anisotropic van der Waals (vdW)...
We report terahertz (THz)-pump/mid-infrared probe near-field studies on Si-doped GaAs–InGaAs core–shell nanowires utilizing THz radiation from the free-electron laser FELBE. Upon excitation of free carriers, we observe a red shift plasma resonance in both amplitude and phase spectra, which attribute to heating electrons conduction band. The simulation heated electron distributions anticipates significant population L- X-valleys. two-temperature model is utilized for quantitative analysis...
We report THz-pump / mid-infrared probe near-field studies on Si-doped GaAs-InGaAs core-shell nanowires utilizing THz radiation from the free-electron laser FELBE. Upon excitation of free carriers, we observe a red shift plasma resonance in both amplitude and phase spectra, which attribute to heating up electrons conduction band. The simulation heated electron distributions anticipates significant population L- X-valleys. two-temperature model is utilized for quantitative analysis dynamics...
Abstract Structural anisotropy in a crystal is one of the key tools for controlling light propagation. The correlation between crystalline structure and interaction with strongest infrared spectral regime, where optical frequencies overlap anisotropic lattice resonances materials, thereby enabling light-matter coupling through quasiparticles called phonon polaritons (PhPs). In recent years, exploration PhPs materials has yielded new levels confinement manipulation light. strongly bonds such...
The terahertz (THz) frequency range is key to study collective excitations in many crystals and organic molecules. However, due the large wavelength of THz radiation, local probing these smaller crystalline structures or few-molecular arrangements, requires sophisticated methods confine light down nanometer length scale, as well manipulate such a confined radiation. For this purpose, recent years, taking advantage hyperbolic phonon polaritons (HPhP) highly anisotropic van der Waals (vdW)...
Terahertz (THz) electromagnetic radiation is key to optically access collective excitations such as magnons (spins), plasmons (electrons), or phonons (atomic vibrations), thus bridging between optics and solid-state physics. Confinement of THz light the nanometer length scale desirable for local probing in low dimensional systems, thereby inherently circumventing large footprint spectral density far-field optics. For that purpose, phonon polaritons (PhPs, i.e., coupled lattice vibrations...