Semiclassical Asymptotics for the Maxwell - Dirac System

We study the coupled system of Maxwell and Dirac equations from a semiclassical point of view. A rigorous nonlinear WKB-analysis, locally in time, for solutions of (critical) order $O(\sqrt{\epsilon})$ is performed, where the small semiclassical parameter $\epsilon$ denotes the microscopic/macroscopic scale ratio

Chemoenzymatic Dynamic Kinetic Resolution of Primary Amines Catalyzed by CAL-B at 38–40 °C

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Decoding Polarization in a Single Achiral Gold Nanostructure from Emitted Far-Field Radiation

The emergence of optical chirality in the light emitted from plasmonic nanostructures is commonly associated with their geometrical chirality. Although it has been demonstrated that even achiral structures can exhibit chiral near-fields, the existence of chiroptical far-field responses of such structures is widely neglected. In this paper, we present a detailed analysis of the polarization state in a single planar achiral plasmonic nanostructure that sustains more than one prominent plasmon mode. In consideration of the relative phase, the superposition of the fields associated with these modes determines the polarization state of the emitted light in the far-field. Supported by simulations of the surface charge distribution of the particle, we show that the polarization state of the emitted light is already determined in the near-field. The chiroptical far-field responses are analyzed by polarized single-particle dark-field scattering spectroscopy. We introduce an analytical model that enables us to obtain the polarization information from the spectra of structures with dipolar resonances taken under unpolarized illumination. The same principle is confirmed in polarimetric spectroscopy measurements on rhomboids with systematically varied angles, therefore, introducing increasing values of geometrical chirality to the structures. The agreement between the calculation and measurement demonstrates the general validity of our model for both chiral and achiral structures

Didactics use of Rokytka river-basin

We live in the age of new discoveries and modern technologies and the education should not run behind the dynamic development of modern society as well. It should suit to actual trends and try to aplicate them to the education processes. In my thesis I deal with a lot of possibilities how to applicate modern technologies to the education of biology and how to use it during the pupil's home preparation. On the basis of student's attitude to the new technologies I made a material which combines the education in landscape with active multimedial preparation. Practically, I tested the colective work with this material, then I combined the gained knowledges with demostrative possibilities of the stream Rokytka. On the basis of these immediate knowledges I made a material which should lead the pupil to active searching of new information in multimedial programme and which should fix the knowledges gained in countryside