A5085447908- Force Microscopy Techniques and Applications
- Piezoelectric Actuators and Control
- Advanced Measurement and Metrology Techniques
- Optical measurement and interference techniques
- Mechanical and Optical Resonators
- Advanced MEMS and NEMS Technologies
- Adaptive optics and wavefront sensing
- Iterative Learning Control Systems
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced Surface Polishing Techniques
- Advanced optical system design
- Near-Field Optical Microscopy
- Flexible and Reconfigurable Manufacturing Systems
- Photonic and Optical Devices
- Carbohydrate Chemistry and Synthesis
- Optical Wireless Communication Technologies
- Optical Systems and Laser Technology
- Asphalt Pavement Performance Evaluation
- Robotics and Sensor-Based Localization
- Electric Motor Design and Analysis
- Advanced Optical Sensing Technologies
- Bone health and osteoporosis research
- Surface Roughness and Optical Measurements
- Optical Coherence Tomography Applications
- Glycosylation and Glycoproteins Research
TU Wien
2016-2025
Christian Doppler Laboratory for Thermoelectricity
2016-2024
University of Applied Sciences Technikum Wien
2019-2024
Institute of Automation
2022-2023
University of Vienna
2012-2020
King's College London
2019
Graz University of Technology
2004-2014
Mechatronic Systemtechnik (Austria)
2014
Johannes Kepler University of Linz
2014
University of Technology
2014
We demonstrate controllable shift of the threshold voltage and turn-on in pentacene thin film transistors rubrene single crystal field effect (FET) by use nine organosilanes with different functional groups. Prior to depositing organic semiconductors, were applied SiO2 gate insulator from solution form a self assembled monolayer (SAM). The observed transfer characteristics range -2 50 V can be related surface potential layer next transistor channel. Concomitantly mobile charge carrier...
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> A new mechanical scanner design for a high-speed atomic force microscope (AFM) is presented and discussed in terms of modeling control. The positioning range this 13 <formula formulatype="inline"><tex>$\mu$</tex> </formula>m the formulatype="inline"><tex>$X$</tex></formula>- formulatype="inline"><tex>$Y$</tex></formula>-directions 4.3 formulatype="inline"><tex>$\mu$</tex></formula>m vertical...
We identify the dynamics of an atomic force microscope (AFM) in order to design a feedback controller that enables faster image acquisition at reduced imaging error compared now generally employed proportional integral differential (PID) controllers. First, model for tip–sample interaction AFM is used show dynamic behavior cantilever working contact mode can be neglected control purposes due relatively small oscillation amplitude response defined topography step. Consequently, system...
The Atomic Force Microscope (AFM) is one of the most versatile tools in nanotechnology. For control engineers this instrument particularly interesting, since its ability to image surface a sample entirely dependent upon use feedback loop. This paper will present tutorial on AFMs. We take reader walk around loop and discuss each individual technology components. major imaging modes are described from controls perspective recent advances geared at increasing performance these microscopes highlighted.
Fast and precise positioning is a basic requirement for nanotechnology applications. Many scanning-probe microscopes (SPM) use piezoelectric tube scanner actuation with nanometer resolution in all three spatial directions. Due to the dynamics of actuator, imaging speed SPM limited. By applying model-based open-loop control, dynamic behavior can be compensated, reducing displacement error, topographical artifacts, modulation interaction force, relative tip-sample velocity. The controlled...
Innovations in engineering, miniaturization, and control-system design have the potential to allow faster imaging by atomic force microscopes.
Lidar, the acronym of light detection and ranging, has received much attention for automotive industry as a key component high level automated driving systems due to their resolution highly accurate 3D imaging surroundings under various weather conditions. However, price lidar sensors still do not meet target values market be accepted basic sensor ensuring safe autonomous driving. Recent work focused on MEMS scanning mirrors potential solution affordable long range systems. This paper...
One of the challenges in designing recycled asphalt mixtures with a high amount reclaimed pavement (RAP) is estimating blending degree between RAP binder and added virgin bitumen. The extent crucial because concrete response influenced by final properties. This paper focuses on evaluation interaction bitumen studying microstructures zone atomic force microscopy (AFM). AFM used to probe change microstructural properties from these two. Averaged have been observed thin-film blends pure...
Abstract Collagen fibrils are central to the molecular organization of extracellular matrix (ECM) and defining cellular microenvironment. Glycation collagen is known impact on cell adhesion migration in context cancer model studies, glycation molecules has been shown affect binding other ECM components collagen. Here we use TEM show that ribose-5-phosphate (R5P) – potentially important microenvironment actively dividing cells, such as cells disrupts longitudinal ordering and, using KFM FLiM,...
An advanced controller consisting of a feedback and feedforward part is presented to improve the performance an atomic force microscope (AFM) enabling topography measurements at higher scan rates with reduced measurement error. The tip–sample interaction held constant by -controller while scanner simultaneously tracked last recorded line model-based controller. designed implemented on commercial AFM system compare standard proportional integral controlled AFM. new reduces error enables...
Recent results have demonstrated the feasibility of video-rate scanning tunneling microscopy and atomic force microscopy. The further development this technology will enable direct observation many dynamic processes that are impossible to observe today with conventional Scanning Probe Microscopes (SPMs). Examples atom molecule diffusion processes, motion molecular motors, real-time film growth, chemical or catalytic reactions. Video-rate probe might also lead extended application SPMs in...
Countermeasures to the aging of bituminous asphalt binders is a highly important topic for service-life extension in field and recycling old pavements into new structures with similar functional requirements as original structure. are usually achieved by applying additives that restore adhesive mechanical properties binder. The commonly termed (asphalt) rejuvenators. This study examined performance two very distinct rejuvenating agents. effectiveness rejuvenators measured comparing...
While nanopositioners often use flexures for high quality motion avoiding nonlinearities, the achievable range and energy efficiency are limited, due to force required positioning against flexures. To overcome problem, this paper proposes a flexure-guided nanopositioner with nonlinear hybrid reluctance actuator large efficiency. The has negative stiffness that partially cancels flexures' stiffness. Consequently, nonlinearities reduce current by up 67%. compensate them high-precision in...
This paper presents the design, assembly, and evaluation of a novel integrated two degree freedom (2DoF) actuator design for tip/tilt motion its integration into fast steering mirror with comparably large range. The system is designed scanning applications, such as in optical metrology systems, comprises an symmetric 2DoF hybrid-reluctance-force moverflexure-design. employs permanent magnet biasing constant flux coils per axis to generate positioning mover. prototype has angular range ±3°...
Recent advancements in free-space optical (FSO) communications are enabling a breakthrough satellite miniaturization and data transfer rates. The CubeISL laser communication terminal (LCT), development of the German Aerospace Center (DLR), is set to showcase inter-satellite links at 100 Mbps downlinks 1 Gbps once it launches 2025. This technology aims establish itself as cutting-edge solution for efficient CubeSat communications, delivering high To validate its capabilities, underwent...
The dynamics of the microcantilever in atomic force microscopy (AFM) is represented by a multiple-degrees-of-freedom state-space model and discussed within framework system theory. cantilever modeled as linear time-invariant with nonlinear output feedback due to tip-sample interaction. This allows one use same analyze different aspects such contact-mode or tapping-mode AFM. approach dynamic response AFM for numerically efficient simulations. We show that not only eigenfrequency but also...
This paper introduces a system and controller design of an electromagnetically actuated fast steering mirror (FSM) tailored for Lissajous trajectories. The proposed enables improved performance in terms energy consumption tracking precision. By individually tuning the stiffness each scan axis FSM system, resonance frequencies are placed at drive desired trajectory. dual tone feedback control is presented, matched to scanning trajectory tuned dynamics. It shown that compared with...