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Enhanced spectroscopy with photons and electrons
Kabát, Jiří ; Neuman, Tomáš (oponent) ; Konečná, Andrea (vedoucí práce)
One of the main applications of infrared spectroscopy is analysis of the composition and chemical properties of molecular samples. However, the far-field infrared spectroscopy techniques often suffer to detect small amounts of molecules. One of the ways to overcome the low signal of minute molecular amounts is by introducing the influence of a strong near field. In this thesis, we theoretically study the enhanced infrared spectroscopy with photon and electron probes. First, we review the theoretical background, with a focus on electrodynamics and nanophotonics. Then we show the results of numerical and analytical calculations for the optical cross sections and the electron energy loss spectra for nano-antennas. The main part of this thesis deals with semi-analytical modeling of the antenna-molecules system, where we compare the results of molecular signatures in the spectra from the model with the numerical simulations. Last, we establish figures of merit for designing nano-antenna with the best performance in enhanced spectroscopy for the considered system and signal detection.

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