Jana Flajsmanova

My research topic was Optical manipulation and spectroscopy of microparticles and nanoparticles at low pressures and in aqueous media. I designed and aligned various experimental optical systems including vacuum apparatus, performed measurements and data processing.

In the group of Optical Micro-manipulation Techniques, I was focused on optical trapping of micro and nanoparticles and their spectroscopy. I build the optical setup and performed experiments together with data processing.

Theoretical and laboratory exercises on Classical Physics: Mechanics and Electromagnetism.

During my Erasmus stay, I worked in s-SNOM lab and my research topic was Towards correlative infrared antenna mapping with EELS and s-SNOM.

I did popularization of science for elementary schools and high schools.

A deeper understanding of behaviour of optically trapped particles reveals underlying physical phenomena arising from the light-matter interaction. I explained the enhancement of the pulling force acting on optically bound particles in the structured optical field, so-called tractor beam. Subsequently, I focused on the optical levitation of a particle in a vacuum. We proposed a novel methodology for a characterization of properties of a weakly non-linear Duffing oscillator represented by an optically levitated nanoparticle. The method is based on averaging recorded trajectories with defined initial positions in the phase space of nanoparticle position and momentum and provides us with the oscillator parameters directly from the recorded motion. I also worked on cooling of center-od-mass motion of an optically levitated particle using active optical feedback.

I measured extinction spectra of optically trapped plasmon nano-particles utilizing optical tweezers and dark-filed microscopy. Graduated with honors.

I analyzed antenna structures on membranes using scattering-type near-field optical miscroscopy.

I studied sequential growth of GaN nanocrystals on SiO2 substrate modified by focused ion beam. The crystal growth was performed in UHV and analyzed by X-ray photoelectron spectroscopy, atomic force microscopy and photoluminescence microscopy. Graduated with honors.