A5063560960- Advanced Radiotherapy Techniques
- Plasmonic and Surface Plasmon Research
- Gold and Silver Nanoparticles Synthesis and Applications
- Medical Imaging Techniques and Applications
- Advanced X-ray and CT Imaging
- Radiation Dose and Imaging
- Photonic and Optical Devices
- Radiation Therapy and Dosimetry
- Near-Field Optical Microscopy
- Quantum Information and Cryptography
- Orbital Angular Momentum in Optics
- Advances in Oncology and Radiotherapy
- Quantum and electron transport phenomena
- Magneto-Optical Properties and Applications
- Prostate Cancer Diagnosis and Treatment
- Magnetic properties of thin films
- Mechanical and Optical Resonators
- Breast Cancer Treatment Studies
- Prostate Cancer Treatment and Research
- Advanced Fluorescence Microscopy Techniques
- Optical Coatings and Gratings
- Radiomics and Machine Learning in Medical Imaging
- Digital Radiography and Breast Imaging
- Terahertz technology and applications
- Contact Dermatitis and Allergies
Universitätsklinikum Würzburg
2023-2025
Universitätsklinik für Strahlentherapie
2025
University of Würzburg
2013-2024
V.M. Koretsky Institute of State and Law
2018
Material (Belgium)
2018
Single femtosecond optical laser pulses, of sufficient intensity, are demonstrated to reverse magnetization in a process known as all-optical switching. Gold two-wire antennas placed on the switching film TbFeCo. These structures resonant with field, and they create field enhancement near-field which confines area where can occur. The magnetic that occurs around below antenna is imaged using X-ray holography circular dichroism. results not only show feasibility controllable assistance but...
Spectral interferometry is employed to fully characterize amplitude and phase of propagating plasmons that are transmitted through silver nanowires in the form ultrashort pulses. For nanowire diameters below 100 nm, plasmon group velocity found decrease drastically accordance with theory adiabatic focusing. Furthermore, dependence on local environment demonstrated. Our findings relevance for design implementation nanoplasmonic signal processing view coherent control applications.
The abilty to control signal propagation in optical-plasmonic nanocircuits may be important for future ultrafast computers. Scientists design and fabricate a directional coupler, an essential element of nano-optical circuits, demonstrate coherent plasmon propagation.
We experimentally demonstrate synthesis and in-situ analysis of multimode plasmonic excitations in two-wire transmission lines supporting a symmetric an antisymmetric eigenmode. To this end we irradiate incoupling antenna with diffraction-limited excitation spot exploiting polarization- position-dependent efficiency. Modal is performed by recording the far-field emission two mode-specific spatially separated spots at far line. illustrate power approach selectively determine group velocities...
Abstract Motivation Online adaptive radiotherapy with Ethos is based on the anatomy determined from daily cone beam computed tomography (CBCT) images. Dose optimization and computation are performed density map of a synthetic CT (sCT), deformable registration initial planning (pCT) onto current CBCT. Large changes as present in lung region challenging system. Methods Treatment plans for were created delivered 1, 2, 3 cm diameter lesions an anthropomorphic phantom, combining different insets...
Background/Objectives: Gantry-free cone-beam CT (CBCT) allows for ultra-high-resolution (UHR) upper extremity imaging in a comfortable tableside position. The aim of this study was to assess the organ-specific radiation burden and effect dedicated lead shielding UHR-CBCT wrist elbow. Methods: A modified Alderson-Rando phantom scanned with mode twin robotic X-ray system employing identical scan parameters elbow imaging. An ion chamber used conjunction an electrometer obtain representative...
Quantum photonics holds great promise for future technologies such as secure communication, quantum computation, simulation, and metrology. An outstanding challenge is to develop scalable miniature circuits that integrate single-photon sources, linear optical components, detectors on a chip. Plasmonic nanocircuits will play essential roles in developments. However, plasmonic circuits, integration of stable, bright, narrow-band single photon sources the structure has so far not been reported....
The design of noble-metal plasmonic devices and nanocircuitry requires a fundamental understanding control the interference modes. Here we report first visualization propagation guided modes in showcase nanocircuit using normal-incidence nonlinear two-photon photoemission electron microscopy (PEEM). We demonstrate that contrast to commonly used grazing-incidence illumination scheme, PEEM provides direct image structure's near-field intensity distribution due absence beating patterns despite...
The photon spin is an important resource for quantum information processing as the electron in spintronics. However, subwavelength confined optical excitations, polarization a global property of mode cannot be defined. Here, we show that any state plane-wave can reversibly mapped to pseudospin embodied by two fundamental modes plasmonic two-wire transmission line. We design device which this evolves well-defined fashion throughout reminiscent evolution birefringent medium and behavior spins...
The recently introduced Varian Ethos system allows adjusting radiotherapy treatment plans to anatomical changes on a daily basis. uses artificial intelligence speed up the process of creating adapted plans, comes with its own software solutions and requires substantially different workflow. A detailed analysis possible risks associated workflow is presented.
Helium ion milling of chemically-synthesized micron-sized gold flakes is performed to fabricate ultra-narrow nanoslit cavities with a varying length and width down 5 nm.
Coupling mechanical degrees of freedom with plasmonic resonances has potential applications in optomechanics, sensing, and active plasmonics. Here we demonstrate a suspended two-wire nano-antenna acting like nano-electrometer. The antenna wires are supported electrically connected via thin leads without disturbing the resonance. As voltage is applied, equal charges induced on both wires. resulting equilibrium between repulsive Coulomb force restoring elastic bending enables us to precisely...
Cone-beam computed tomography (CBCT)-based online adaptation is increasingly being introduced into many clinics. Upon implementation of a new treatment technique, prospective risk analysis required and enhances workflow safety. We conducted using Failure Mode Effects Analysis (FMEA) upon the introduction an adaptive programme (Wegener et al., Z Med Phys. 2022). A analysis, lacking in-depth clinical experience with modality or machine, relies on imagination estimates occurrence different...
The results of 10 years patch testing in children aged 3–16 are reported. commonest allergens found were nickel, cobalt, para‐dyes and chromate. 26 cases recorded detail.
We describe a setup consisting of 4f pulse shaper and microscope with high-NA objective lens discuss the aspects most relevant for an undistorted spatiotemporal profile focused beam. demonstrate shaper-assisted compression in focus to sub-10-fs duration using phase-resolved interferometric spectral modulation (PRISM). introduce nanostructure-based method sub-diffraction characterization strongly pulses. The distortions caused by optical aberrations space-time coupling from can be reduced...
Evaluation of delivered dose to the dominant intraprostatic lesion (DIL) for moderately hypofractionated radiotherapy prostate cancer by cone beam computed tomography (CBCT)-based accumulation and target coverage analysis.Twenty-three patients with localized treated simultaneous integrated boost (SIB) between December 2016 February 2020 were retrospectively analyzed. Included required have an identifiable DIL on bi-parametric planning magnetic resonance imaging (MRI). After import into...
Purpose The integral quality monitor (IQM) transmission detector is a wedge‐shaped large area ionization chamber that reports position‐weighted dose product for each control point of an IMRT or VMAT plan. In this study, the accuracy signal prediction verified Synergy Agility MLC. Tolerance criteria plan verification with IQM were obtained from observed sensitivity detection incorrectly delivered plans. Methods predicted was compared to measured recorded set 30 plans beam 6 and 10 MV....
Exact quantitative understanding of plasmon propagation along nanowires is mandatory for designing and creating functional devices. Here we investigate transmission through top-down fabricated monocrystalline gold on a glass substrate. We show that the finite-length can be described by Fabry-P\'{e}rot oscillations beat with free-space propagating light launched at incoupling end. Using an extended model, experimental simulated length dependent signals agree quantitatively fully analytical model.
Using a combination of photoemission electron microscopy and numerical simulations, we investigated the angular moment transfer in strongly enhanced optical near-fields artificially fabricated antennas. The polarization dependence near-field enhancement has been measured maximum symmetric geometry, i.e., excitation by normal incident planar wave. Finite-difference time-domain simulations for realistic antenna geometries as determined high-resolution reveal very good agreement with...
Abstract Coherent perfect absorption (CPA) describes the absence of all outgoing modes from a lossy resonator, driven by lossless incoming modes. Here, we show that for nanoresonators also exhibit radiative losses, e.g., plasmonic nanoantennas, generalized version CPA (gCPA) can be applied. In gCPA are suppressed only subset (guided plasmonic) while other (radiative) treated as additional loss channels - situation typically referred to impedance matching. Here make use how achieve matching...