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Georg Fantner

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Publications associées (86)

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Rise time reduction of thermal actuators operated in air and water through optimized pre-shaped open-loop driving

Georg Fantner, Nahid Hosseini, Tom Larsen

Electrothermal actuators have many advantages compared to other actuators used in micro-electro-mechanical systems (MEMS). They are simple to design, easy to fabricate and provide large displacements at low voltages. Low voltages enable less stringent pass ...

2017

Studying biological membranes with extended range high-speed atomic force microscopy

Georg Fantner, Adrian Pascal Nievergelt, Jonathan David Adams, Blake William Erickson, Nahid Hosseini

High-speed atomic force microscopy has proven to be a valuable tool for the study of biomolecular systems at the nanoscale. Expanding its application to larger biological specimens such as membranes or cells has, however, proven difficult, often requiring ...

Nature Publishing Group2015

Deep learning for enhancement of low-resolution and noisy scanning probe microscopy images

Georg Fantner, Marcos Penedo Garcia

In this study, we employed traditional methods and deep learning models to improve resolution and quality of low-resolution AFM images made under standard ambient scanning. Both traditional methods and deep learning models were benchmarked and quantified r ...

Beilstein Institut2025

Large‐Range HS‐AFM Imaging of DNA Self‐Assembly through In Situ Data‐Driven Control

Alireza Karimi, Georg Fantner, Maartje Martina Cornelia Bastings, Adrian Pascal Nievergelt, Christoph Manuel Kammer, Charlène Cécile Geneviève Brillard, Eva Eugene Kurisinkal

Understanding hierarchical self-assembly of biological structures requires real time measurement of the self-assembly process over a broad range of length- and timescales. The success of high-speed atomic force microscopy (HS-AFM) in imaging small scale mo ...

2019

An analog high-speed single-cycle lock-in amplifier for next generation AFM experiments

Georg Fantner, Jens Anders, Adrian Pascal Nievergelt

In this paper, we present a new architecture for analog amplitude demodulation in high-speed atomic force microscopy (AFM) applications. It features single-cycle capabilities and the possibility to work with elevated cantilever resonance frequencies up to ...

IEEE2018

High-frequency multimodal atomic force microscopy

Georg Fantner, Adrian Pascal Nievergelt, Jonathan David Adams, Pascal Damian Odermatt

Multifrequency atomic force microscopy imaging has been recently demonstrated as a powerful technique for quickly obtaining information about the mechanical properties of a sample. Combining this development with recent gains in imaging speed through small ...

Beilstein-Institut2014

Bone fracture risk assessing method involves inserting test probe through periosteum and soft tissue on bone, so as to evaluate resistance of bone to microscopic fracture

Georg Fantner

NOVELTY - The test probe (100) is inserted through periosteum and/or soft tissue on a bone, such that the test probe contacts the bone. The test probe is inserted multiple times into same location of the bone, to create one or more microscopic fractures in ...

2007

Overlapping and essential roles for molecular and mechanical mechanisms in mycobacterial cell division

Georg Fantner, John McKinney, Adrian Pascal Nievergelt, Mélanie Thérèse Marie Hannebelle, Haig Alexander Eskandarian, Pascal Damian Odermatt

Mechanisms to control cell division are essential for cell proliferation and survival. Bacterial cell growth and division require the coordinated activity of peptidoglycan synthases and hydrolytic enzymes to maintain mechanical integrity of the cell wall. ...

2020

Fabrication of fluid-compatible trilayer cantilevers with integrated piezoelectric actuators

Luis Guillermo Villanueva Torrijo, Georg Fantner, Damien Maillard, Nahid Hosseini, Mustafa Kangül, Matthias Neuenschwander

Microcantilevers are popular transducers thanks to their simple design and a high sensitivity. In many applications, the cantilevers need to be actuated, either to induce a controlled deflection or to excite the resonance. This can be achieved with integra ...

2025

Enhanced feedback performance in off-resonance AFM modes through pulse train sampling

Georg Fantner, Marcos Penedo Garcia, Santiago Harald Andany, Mustafa Kangül, Navid Asmari Saadabad

Dynamic atomic force microscopy (AFM) modes that operate at frequencies far away from the resonance frequency of the cantilever (off-resonance tapping (ORT) modes) can provide high-resolution imaging of a wide range of sample types, including biological sa ...

Beilstein-Institut2024

Engineering Optically Active Defects in Hexagonal Boron Nitride Using Focused Ion Beam and Water

Aleksandra Radenovic, Andras Kis, Georg Fantner, Ahmet Avsar, Michal Daniel Macha, Evgenii Glushkov, Vytautas Navikas, Nathan Cyprien Arsène Ronceray, Aqeel Ahmed, Cheol Yeon Cheon, Esther Braun

Hexagonal boron nitride (hBN) has emerged as a promising material platform for nanophotonics and quantum sensing, hosting optically active defects with exceptional properties such as high brightness and large spectral tuning. However, precise control over ...

AMER CHEMICAL SOC2022

Large-scale analysis of high-speed atomic force microscopy data sets using adaptive image processing

Georg Fantner, Jonathan David Adams, Blake William Erickson, Séverine Coquoz

Modern high-speed atomic force microscopes generate significant quantities of data in a short amount of time. Each image in the sequence has to be processed quickly and accurately in order to obtain a true representation of the sample and its changes over ...

Beilstein-Institut2012

Kinetic and structural roles for the surface in guiding SAS-6 self-assembly to direct centriole architecture

Pierre Gönczy, Georg Fantner, Adrian Pascal Nievergelt, Santiago Harald Andany, Niccolo Banterle, Georgios Hatzopoulos, Charlène Cécile Geneviève Brillard

Discovering mechanisms governing organelle assembly is a fundamental pursuit in biology. The centriole is an evolutionarily conserved organelle with a signature 9-fold symmetrical chiral arrangement of microtubules imparted onto the cilium it templates. Th ...

Nature Portfolio2021

Growth and dissolution of calcite in the presence of adsorbed stearic acid

Francesco Stellacci, Georg Fantner, Kislon Voitchovsky, Blake William Erickson, Maria Ricci

The interaction of organic molecules with the surface of calcite plays a central role in many geochemical, petrochemical and industrial processes and in biomineralization. Adsorbed organics, typically fatty acids, can interfere with the evolution of calcit ...

American Chemical Society2015

Increased imaging speed and force sensitivity for bio-applications with small cantilevers using a conventional AFM setup

Georg Fantner

In this study, we demonstrate the increased performance in speed and sensitivity achieved by the use of small AFM cantilevers on a standard AFM system. For this, small rectangular silicon oxynitride cantilevers were utilized to arrive at faster atomic forc ...

Elsevier2012

Integration of sharp silicon nitride tips into high-speed SU8 cantilevers in a batch fabrication process

Georg Fantner, Santiago Harald Andany, Oliver Peric, Nahid Hosseini, Matthias Neuenschwander, Jonathan David Adams

Employing polymer cantilevers has shown to outperform using their silicon or silicon nitride analogues concerning the imaging speed of atomic force microscopy (AFM) in tapping mode (intermittent contact mode with amplitude modulation) by up to one order of ...

Beilstein Institut2019

A versatile atomic force microscope integrated with a scanning electron microscope

Georg Fantner

A versatile atomic force microscope (AFM), which can be installed in a scanning electron microscope (SEM), is introduced. The flexible design of the instrument enables correlated analysis for different experimental configurations, such as AFM imaging direc ...

2017

Self-Actuated Polymer-Based Cantilevers With Sharp Silicon Tips For High-Speed Atomic Force Microscopy

Georg Fantner, Santiago Harald Andany, Nahid Hosseini, Matthias Neuenschwander

High-speed atomic force microscopy has thus far largely been limited to the use of small cantilevers in liquid, but the technique would greatly profit areas of nanotechnology that require the use of larger probes in air. We present polymer-based cantilever ...

IEEE2021

Scanning probe microscope e.g. atomic force microscope, has two actuators arranged in opposed push-pull configuration, and support constrains motion of one of two actuators in one axis to permit translation along another axis

Georg Fantner

NOVELTY - The microscope has a housing (12), and two actuators (14, 16) are arranged in an opposed push-pull configuration that is coupled to the housing. A support (22) is coupled to the housing and to one of the two actuators at a position that is spaced ...

2006

Combining thermal scanning probe lithography and dry etching for grayscale nanopattern amplification

Jürgen Brugger, Andras Kis, Giovanni Boero, Arnaud Bertsch, Georg Fantner, Zhenyu Wang, Marcos Penedo Garcia, Xia Liu, Mitali Banerjee, Ana Conde Rubio, Berke Erbas, Joffrey Pernollet

Grayscale structured surfaces with nanometer-scale features are used in a growing number of applications in optics and fluidics. Thermal scanning probe lithography achieves a lateral resolution below 10 nm and a vertical resolution below 1 nm, but its maxi ...

Springernature2024