A new kind of optical microresonators from droplets of nematic liquid crystal were made. The light is trapped inside these spheres and »circulates« close to the surface. Instead of using isotropic solid state spheres, we used nematic drops, since their refraction index can be changed with the external electric field. Observations were in excelent agreement with our numerical simulations. By applying electric field we have achieved tuning range almost hundred times larger than in solid microresonators. This enables their application for tunable lasers, active filters and optical switches.
COBISS.SI-ID: 22940455
We show that chiral ordering of the underlying complex fluid strongly influences defect formation and colloidal interactions. Nonsingular topological defect loops bind spontaneously and form pairs of colloidal particles. Pairs can be assembled in chiral 2D colloidal crystal using laser tweezers. Extended numerical simulations were crucial for the understandig of these complex collodal structures.
COBISS.SI-ID: 22895655
With numerical simulations of nematc colloids we showed that based on shearing of nematic defect lines by two ore more particles complex colloidal structures can be formed. These structures entangled by networks of disclinations – nematic braids - exhibit robust string like bonding. Their stabiility and possibility of the selfassembly are of great potential for applications in photonics and plazmonics. Our achivements lead to the invitation to writte two papers on entangled structures fo the journal "Soft Matter".
COBISS.SI-ID: 2191716
We study the behavior of spherical Janus colloidal particles in the nematic liquid crystal, where one hemisphere induced planar and the other hemisphere induce perpendicular ordering of the liquid crystal. According to our numerical simulations equilibrium orientations of Janus particles, their interactions, and a novel type of nematic colloidal particle, called a boojum-ring were observed and analyzed.
COBISS.SI-ID: 757930
We found that the temparature during the synthesis determines the morphology of the MoS2 nanotube hybrids. We proposed a stable thickness of sub-cylinders in coaxial nanotubes and for the first time observed nucleation of a fullerene-like MoS2. We obtaned atomically resolved image of a surface of the MoS2 nanosphere.
COBISS.SI-ID: 23045415