Yera Ussembayev

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Verified

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• PhD
• Postdoc at Ghent University

Anti-Brownian electrokinetic trapping enables the confinement of individual nanoparticles in liquids by applying electric fields. This technique facilitates the long-term observation of nanoscopic objects, allowing for detailed studies of their physical, chemical, and biomolecular properties. However, this method has been largely restricted to nano...

100 years ago, in 1923, the Nobel prize in physics was awarded for measurement of the unit charge. In addition to a profound impact on contemporary physics, this discovery has reshaped our understanding of charge-based interactions in chemistry and biology, ranging from oxidation and ionization to protein folding and metabolism. In a liquid, the di...

Externally induced color‐ and shape‐changes in micrometer‐sized objects are of great interest in novel application fields such as optofluidics and microrobotics. In this work, light and temperature responsive micrometer‐sized structural color actuators based on cholesteric liquid‐crystalline (CLC) polymer particles are presented. The particles are...

Deflecting light with high efficiency over large angles with thin optical elements is challenging but offers tremendous potential for applications, such as wearable displays and optical communication systems. Compared to the complex production of metasurfaces, the self‐organization of liquid crystal (LC) superstructures provides an elegant and flex...

Photon absorption and emission play a key role in our understanding of how light interacts with matter. An attractive system to explore these processes are semiconductor nanoparticles (SNP) with their distinguishable photoluminescence, which makes them widely applied in optoelectronics, laser technology and biophotonics. In current implementations...

An improved small‐circle scanning fluorescence correlation spectroscopy (sFCS) technique is introduced by combining acousto‐optical laser scanning with fitting the autocorrelation function in the frequency domain. The technique is validated using both simulation and experimental data on various fluorescent nanoparticles, including polystyrene beads...

The cover shows the axial electrokinetic trapping of fluorescence-free nanoparticles using total internal microscopy.

A novel design and approach for the realization of liquid crystal optical waveguides using photopatterning as a manufacturing method is presented. The developed method is used to demonstrate straight waveguides of different widths and curved waveguides with different radius of curvature. The waveguides are terminated with +1 or −1 surface defects t...

Liquid crystalline polymers are attractive materials for untethered miniature soft robots. When they contain azo dyes, they acquire light‐responsive actuation properties. However, the manipulation of such photoresponsive polymers at the micrometer scale remains largely unexplored. Here, uni‐ and bidirectional rotation and speed control of polymeriz...

To enable detailed studies of interactions between nanoparticles and their environment and the correlations between various nanoparticle properties, one must go beyond ensemble averages and toward single‐particle measurements. However, current methodologies for the single‐nanoparticle analysis of charge and size either lack the flexibility to study...

Nanostructured shapes comprising at least a first part and a second part. The first part has a longitudinal axis L and comprises a first absorbing material and an emitting mate rial. The second part is connected to the first part and comprises a second absorbing material. The second part mainly absorbs light with direction of polarization other tha...

The electrophoretic mobility of micron-scale particles is of crucial importance in applications related to pharmacy, electronic ink displays, printing, and food technology as well as in fundamental studies in these fields. Particle mobility measurements are often limited in accuracy because they are based on ensemble averages and because a correcti...

Semiconductor nanoparticles (SNPs), such as quantum dots (QDs) and core/shell nanoparticles, have proven to be promising candidates for the development of next-generation technologies, including light-emitting diodes (LEDs), liquid crystal displays (LCDs) and solar concentrators. Typically, these applications use a sub-micrometer-thick film of SNPs...

Anti-Brownian electrokinetic trapping enables the confinement of single nanoparticles in solution by applying feedback electric forces that counteract Brownian motion. This technique facilitates the long-term observation of nanoparticles to study their different physio-and biochemical properties. However, the method has been greatly restricted to n...

A layer of chiral liquid crystal (CLC) with a photonic bandgap in the visible range has excellent reflective properties. Recently, two director configurations have been proposed in the literature for CLC between two substrates with periodic photo-alignment: one with the director parallel to the substrates and one with the director in the bulk paral...

In article number 1905219, Albertus P. H. J. Schenning and co‐workers fabricate micron‐sized structural color actuators based on photonic polymer particles. The particles exhibit anisotropic spot‐like and arc‐like reflective colored domains ranging from red to blue. Upon light exposure, the particles show reversible asymmetric shape deformations co...

This short video illustrates the working principle of reflective chiral liquid crystal gratings with photo-patterned anchoring at the substrates. A related research paper was published in Advanced Optical Materials and featured on the cover of the journal. https://onlinelibrary.wiley.com/doi/10.1002/adom.201970086 https://onlinelibrary.wiley.com/...

The ability to steer light with miniaturized optical components has attracted great interest for next‐generation technologies. To efficiently diffract light over large angles, Inge Nys and co‐workers (article number 1901364 https://onlinelibrary.wiley.com/doi/abs/10.1002/adom.201901364) have developed a flat optical component with a sub‐micrometer...

The ability to steer light with miniaturized optical components has attracted great interest for next‐generation technologies. To efficiently diffract light over large angles, Inge Nys and co‐workers (article number 1901364) have developed a flat optical component with a sub‐micrometer period. Periodic photo‐alignment at the surface is used in comb...

Core/shell engineering in colloidal synthesis has been emerging as a powerful tool to create semiconductor nanoparticles of various shapes with exceptional photoluminescent properties. In this work, we demonstrate how anisotropy in light absorption and emission can be manipulated by designing the shell geometry and defining the position of the embe...

The invention is directed to a substrate for generating Surface plasmons (SPs) and Surface plasmon polaritons (SPPs) by means of an excitation radiation, wherein the Substrate has a carrier layer and a coating with gold or silver. A surface of the carrier layer is provided with identical Surface structures arranged in an array of rows and columns....

Titanium dioxide (TiO2) is a key component of diverse optical and electronic applications that exploit its exceptional material properties. In particular, the use of TiO2 in its single-crystalline phase can offer substantial advantages over its amorphous and polycrystalline phases for existing and yet-to-be-developed applications. However, the impl...

Commercial HD DVDs provide a characteristic structure of encoding pits which were utilized to fabricate cost efficiently large area SERS substrates for chemical analysis. The study targets the simulation of the plasmonic structure of the substrates and presents an easily accessible fabrication process to obtain highly sensitive SERS active substrat...

The optical torque wrench (OTW) is a powerful technique to measure the torsional properties of different biomolecules, including DNA, DNA-processing protein complexes and rotary motors. To date, quartz has proven to be a convenient birefringent material out of which to synthesize the micron-sized particles essential for this technique. However, the...

Commercial HD DVDs provide a characteristic structure of encoding pits which were utilized to fabricate cost efficiently large area SERS substrates for chemical analysis. The study targets the simulation of the plasmonic structure of the substrates and presents an easily accessible fabrication process to obtain highly sensitive SERS active substrat...

Commercial HD DVDs provide a characteristic structure of encoding pits which were utilized to fabricate cost efficiently large area SERS substrates for chemical analysis. The study targets the simulation of the plasmonic structure of the substrates and presents an easily accessible fabrication process to obtain highly sensitive SERS active substrat...

The optical torque wrench (OTW) allows the direct application and measure- ment of torque on biomolecules, such as DNA or DNA-protein complexes, or rotary motors like the F0F1-ATP-synthase or the bacterial flagellar motor. The applicable torque of the OTW is a function of the size and birefringence of the particle. Quartz has proven a convenient ma...

A plasmon resonance based method for introducing foreign material into living cells is presented. By illuminating gold-coated or structured surfaces, near field enhancement is employed to selectively open the cell membrane using ultrashort laser pulses.