Falko Schmidt

Falko Schmidt
Friedrich Schiller University Jena | FSU · Department of Applied Physics

Doctor of Philosophy

About

28
Publications
8,154
Reads
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218
Citations
Introduction
My research is about developing new methods and insights on active matter systems driven by light and through the local demixing of a phase separating mixture. I am focusing on experimental systems whose understanding we support with simulations and theories.We use microscopic and nanoscopic colloids in combination with optical tweezers and critical binary mixtures. Keywords: #activematter #opticaltweezers #nanoparticles #microparticles #criticalcasimirforces #nonequilibrium
Additional affiliations
May 2019 - present
Lucero Bio
Position
  • Founder
Description
  • I have founded together with other researchers at the University of Gothenburg a spin-off from our research on the optical manipulation of single cells. In cooperation with the Chalmers School of Entrepreneurship we are working on an all in-one solution for automated single cell studies aimed at R&D departments of companies and research labs.
January 2017 - September 2020
University of Gothenburg
Position
  • PhD Student
Description
  • I am carrying out basic research at the soft matter research group at the University of Gothenburg. My research field concerns the study of novel nanorobotics using optical manipulation techniques for the development of intelligent drugs or as remediation technology for water and soil. I am also actively engaged as member of the management board of the Association of Graduate Students in Physics at the departmental and faculty level at the University of Gothenburg.
April 2016 - January 2019
COST - European Cooperation in Science and Technology
Position
  • Supervisor
Description
  • Supervisor at Experimental Training School of COST MP1305 for Optical Tweezers Assembly
Education
January 2017 - January 2021
University of Gothenburg
Field of study
  • Physics
October 2014 - October 2016
University of Leipzig
Field of study
  • International Physics Studies Program (IPSP)
October 2011 - October 2014
University of Leipzig
Field of study
  • International Physics Studies Program (IPSP)

Publications

Publications (28)
Preprint
Full-text available
Casimir forces in quantum electrodynamics emerge between microscopic metallic objects because of the confinement of the vacuum electromagnetic fluctuations occurring even at zero temperature. Their generalization at finite temperature and in material media are referred to as Casimir--Lifshitz forces. These forces are typically attractive, leading t...
Article
Full-text available
Setzt man verschiedene Kolloidpartikelsorten einem nahezu kritischen Lösungsmittel unter Einfluss von Laserlicht aus, dann bilden sich spontan neue dynamische Superstrukturen. Unser Forschungsteam von der Heinrich-Heine-Universität Düsseldorf, der Technischen Universität Darmstadt und der Universität Göteborg, Schweden, hat nun Rückkopplungsprozess...
Article
Full-text available
Active matter comprises self-driven units, such as bacteria and synthetic microswimmers, that can spontaneously form complex patterns and assemble into functional microdevices. These processes are possible thanks to the out-of-equilibrium nature of active-matter systems, fueled by a one-way free-energy flow from the environment into the system. Her...
Preprint
Full-text available
Active matter comprises self-driven units, such as bacteria and synthetic microswimmers, that can spontaneously form complex patterns and assemble into functional microdevices. These processes are possible thanks to the out-of-equilibrium nature of active-matter systems, fueled by a one-way free-energy flow from the environment into the system. Her...
Article
Full-text available
Active particles break out of thermodynamic equilibrium thanks to their directed motion, which leads to complex and interesting behaviors in the presence of confining potentials. When dealing with active nanoparticles, however, the overwhelming presence of rotational diffusion hinders directed motion, leading to an increase of their effective tempe...
Conference Paper
We investigate a nanoparticle inside an optical trap and driven away from equilibrium by self-induced concentration gradients. We find that a nanoparticle performs fast orbital rotations and its probability density shifting away from equilibrium. © 2021 The Author(s)
Thesis
Full-text available
The motion of microscopic objects is strongly a ected by their surrounding environment. In quiescent liquids, motion is reduced to random fluctuations known as Brownian motion. Nevertheless, microorganisms have been able to develop mechanisms to generate active motion. This has inspired researchers to understand and artificially replicate active mo...
Preprint
Full-text available
Active particles break out of thermodynamic equilibrium thanks to their directed motion, which leads to complex and interesting behaviors in the presence of confining potentials. When dealing with active nanoparticles, however, the overwhelming presence of rotational diffusion hinders directed motion, leading to an increase of their effective tempe...
Poster
Full-text available
Thanks to a constant energy input, active matter can self-assemble into phases that dynamically form, reshape and break-up, which are forbidden in equilibrium materials by the entropy maximization principle. Here, we show in experiments and simulations, that activity occurs as an emergent phenomenon only when individual building blocks bind togethe...
Poster
Full-text available
Anomalous diffusion occurs in many physical and biological phenomena, when the growth of the mean squared displacement (MSD) with time has an exponent different from one. Here, we show that recurrent neural networks (RNN) can efficiently determine the exponent characterizing anomalous diffusion from single trajectories, outperforming standard estim...
Poster
Full-text available
The dynamics and statistical properties of active systems are strongly affected by confinement. Here we investigate the steady state of a self-propelling nanoparticle which is both fueled and trapped by a focused laser beam. When increasing laser power we observe a cross-over from a Boltzmann distribution to a non-equilibrium state, where the parti...
Article
Anomalous diffusion occurs in many physical and biological phenomena, when the growth of the mean squared displacement (MSD) with time has an exponent different from one. We show that recurrent neural networks (RNNs) can efficiently characterize anomalous diffusion by determining the exponent from a single short trajectory, outperforming the standa...
Preprint
Full-text available
Anomalous diffusion occurs in many physical and biological phenomena, when the growth of the mean squared displacement (MSD) with time has an exponent different from one. We show that recurrent neural networks (RNN) can efficiently characterize anomalous diffusion by determining the exponent from a single short trajectory, outperforming the standar...
Conference Paper
We provide a new route for active self-assembly, where activity occurs as an emergent phenomenon only when individual building blocks bind together, in a way which we manipulate using laser light.
Article
Full-text available
By converting energy into mechanical work, engines play a central role in most biological and technological processes. In particular, within the current trend towards the development of nanoscience and nanotechnology, microscopic engines have been attracting an ever-increasing interest. On the one hand, there has been a quest to understand how biol...
Article
Full-text available
Thanks to a constant energy input, active matter can self-assemble into phases with complex architectures and functionalities such as living clusters that dynamically form, reshape and break-up, which are forbidden in equilibrium materials by the en- tropy maximization (or free energy minimization) principle. The challenge to control this active se...
Conference Paper
An optically trapped absorbing microsphere in a sub-critical mixture rotates around the optical trap thanks to diffusiophoretic propulsion, which can be controlled by adjusting the optical power, the temperature, and the criticality of the mixture.
Poster
Full-text available
By converting energy into mechanical work, engines play a central role in most biological and technological processes. Here, we experimentally demonstrate a microscopic engine powered by the local reversible demixing of a critical mixture. We show that, when an absorbing microsphere is optically trapped by a focused laser beam in a sub-critical mix...
Conference Paper
We investigate, for the first time and by blinking optical tweezers, the effects of critical Casimir forces (CCFs) on the free dynamics of a pair of spherical colloidal particles, immersed in binary liquid mixtures approaching their critical points.
Conference Paper
We propose a new type of engine that is powered by the local, reversible demixing of a critical binary liquid. A microscopic particle is optically trapped and performs revolutions due to the emergence of diffusiophoresis.
Thesis
Full-text available
By converting energy into mechanical work, engines play a major role in natural and industrial processes. Moreover, due to the current developments in nanoscience and nan- otechnology, micron-sized engines have been attracting an increasing interest in the scientific community. On the one hand, there have been studies to understand the working prin...
Poster
Full-text available
During the last few decades much effort has gone into the miniaturization of machines down to the microscopic scale with robotic solutions indispensable in modern industrial processes and play a central role in many biological systems. There has been a quest in understanding the mechanism behind molecular motors and several approaches have been pro...
Poster
Full-text available
Using random optical light fields, so called speckles, the diffusion of colloidal particles can be altered. By tuning the laser power and the light field's correlation times the particle displays anomalous diffusion. We characterise the particle's motion using digital video microscopy.
Thesis
Full-text available
The aim of this work is to show that optical trapping is possible with speckles. Following it will be demonstrated with what kind of parameters anomalous diffusion can be tuned in an experimental setup. For that sub- and superdiffusion is investigated depending on the strength of the traps and the characteristic time in which the speckles change th...
Poster
Full-text available
Optical tweezers have been used widely in physics, chemistry and biology to manipulate and trap microscopic and nanoscopic objects, such as dielectric and metallic particles, living cells, organelles and macromolecules [1,2]. However, current optical manipulation techniques rely on carefully engineered setups and samples [3]. Although similar condi...

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Projects

Projects (2)
Project
Develop artificial microscopic engine that is powered by critical demixing of a binary liquid in an optical tweezers