Progress and prospects in nonlinear extreme-ultraviolet and X-ray optics and spectroscopy

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Metasurfaces, planar arrays of subwavelength resonators, have emerged as powerful tools for versatile light manipulation in compact formats across different spectral ranges. Among these, the mid-infrared (mid-IR) is uniquely characterized by its interactio ...

The increasing global demand for sustainable energy solutions necessitates innovative approaches to hydrogen production. This study investigates the use of laser pyrolysis as a rapid and efficient method for converting biomass into hydrogen-rich gas, bioch ...

TiO2 has been widely used in developing self-cleaning coatings on textiles. Spin coating is widely used to prepare films due to its simplicity and the ability to control the thickness and the characteristics of the deposited layers. However, it has been sp ...

Isolated attosecond pulses from an X-ray free-electron laser are in high demand for attosecond science, which enables the probing of electron dynamics by X-ray nonlinear spectroscopy and single-particle imaging. The aim of this thesis is to simulate attos ...

The detection of inelastically scattered soft x-rays with high energy resolution usually requires large grating spectrometers. Recently, photoelectron spectrometry for analysis of x-rays (PAX) has been rediscovered for modern spectroscopy experiments at sy ...

Diode effects are of great interest for both fundamental physics and modern technologies. Electrical diode effects (nonreciprocal transport) have been observed in Weyl systems. Optical diode effects arising from the Weyl fermions have been theoretically co ...

Particle accelerators are the drivers for large-scale research infrastructures for particle physics but also for many branches of condensed matter research. The types of accelerator-driven research infrastructures include particle colliders, neutron, muon ...

Photonics integrated circuits are a promising solution for the growing demands of data transmission and future system-on-chip technologies. Within this context, nonlinear optical interactions offer unique opportunities for all-optical processing, sampling, ...

Excitons play an essential role in the optical response of two-dimensional materials. These are bound states showing up in the band gaps of many-body systems and are conceived as quasiparticles formed by an electron and a hole. By performing real-time simu ...

X-rays have been observed in natural downward cloud-to-ground lightning for over 20 years and in rocket-triggered lightning for slightly less. In both cases, this energetic radiation has been detected during the stepped and dart leader phases of downward n ...

Dynamic aperture is an important concept for the study of non-linear beam dynamics in circular accelerators. It describes the extent of the phase-space region where a particle's motion remains bounded over a given number of turns. Understanding the feature ...

Our understanding of quantum materials is commonly based on precise determinations of their electronic spectrum by spectroscopic means, most notably angle-resolved photoemission spectroscopy (ARPES) and scanning tunneling microscopy. Both require atomicall ...

Electrically connected and plasmonically enhanced molecular junctions combine the optical functionalities of high field confinement and enhancement (cavity function), and of high radiative efficiency (antenna function) with the electrical functionalities o ...

This thesis uses femtosecond laser spectroscopy in studying strong correlation in condensed matters that are pertinent to future technology: a wide bandgap perovskite and a quantum material, with the employment of ultrafast time-resolved spectroscopy in th ...

Nonlinear optical frequency conversion is one of the driving research areas in photonics. Its quasi instantaneous response and the promise of low power consumption in integrated structures could cover the demand for fast signal processing with minimal ener ...

Low-level light detection with high spatial and timing accuracy is a growing area of interest by virtue of applications such as light detection and ranging (LiDAR), biomedical imaging, time-resolved Raman spectroscopy, and quantum applications. Single-phot ...

We demonstrate a figure-of-9 all-fiber thulium-doped laser (TDFL) that generates 560 fs long pulses at 1948 nm wavelength. In order to achieve self-starting passive mode-locking, we utilize an in-fiber Faraday rotator to induce a nonreciprocal phase shift. ...

Tip-enhanced Raman spectroscopy (TERS) under ultrahigh vacuum and cryogenic conditions enables exploration of the relations between the adsorption geometry, electronic state, and vibrational fingerprints of individual molecules. TERS capability of reflecti ...

Electron-cyclotron waves are a tool commonly used in tokamaks, in particular to drive current. Their ability to drive current in a very localized manner renders them an optimal tool for MHD mode mitigation. However, such applications require high accuracy ...

Redox reactions underlie several biogeochemical processes and are typically spatiotemporally heterogeneous in soils and sediments. However, redox heterogeneity has yet to be incorporated into mainstream conceptualizations and modeling of soil biogeochemist ...

Progress and prospects in nonlinear extreme-ultraviolet and X-ray optics and spectroscopy

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Design and Application of Functional Mid-IR Metasurfaces for Enhanced Light-Matter Interaction and Sensing

Laser pyrolysis of biomass: Comparing cellulose-rich and lignin-rich feedstocks for hydrogen rich-gas production

TiO2/rough surface of woven cotton fabrics prepared by spin coating for antibacterial and self-cleaning processes

Numerical Study of the Attosecond Free-Electron Laser Pulse Generation in the Soft X-ray Regime at the SwissFEL

A compact approach to higher-resolution resonant inelastic x-ray scattering detection using photoelectrons

Nonlinear optical diode effect in a magnetic Weyl semimetal

Energy-Efficient Particle Accelerators for Research

Parametric Wavelength Conversion in Waveguiding Structures: Efficiency, Bandwidth and Polarization

Exciton migration in two-dimensional materials

Direct observations of X-rays produced by upward positive lightning

Optimizing Dynamic Aperture Studies with Active Learning

Controlling crystal cleavage in focused ion beam shaped specimens for surface spectroscopy

Light Emission and Conductance Fluctuations in Electrically Driven and Plasmonically Enhanced Molecular Junctions

Investigating Non-equilibrium Physics in Wide Bandgap Semiconductors and Quantum Materials via Ultrafast Spectroscopy

Electric-field-induced second-order nonlinear processes in stoichiometric silicon nitride

Advanced Silicon and SWIR Single-Photon Avalanche Diodes: Design, Simulation, and Characterization

Wavelength-stabilized figure-of-9 thulium-doped all-fiber laser emitting 560 fs pulses

Resonant Tip-Enhanced Raman Spectroscopy of a Single-Molecule Kondo System

Impact of microwave beam scattering by density fluctuations on the electron-cyclotron power deposition profile in tokamaks

X-ray chemical imaging for assessing redox microsites within soils and sediments