Generalized 4 ×\times 4 Matrix Formalism for Light Propagation in Anisotropic Stratified Media: Study of Surface Phonon Polaritons in Polar Dielectric Heterostructures

We present a generalized 4 $\times$ 4 matrix formalism for the description of light propagation in birefringent stratified media. In contrast to previous work, our algorithm is capable of treating arbitrarily anisotropic or isotropic, absorbing or non-absorbing materials and is free of discontinous solutions. We calculate the reflection and transmission coefficients and derive equations for the electric field distribution for any number of layers. The algorithm is easily comprehensible and can be straight forwardly implemented in a computer program. To demonstrate the capabilities of the approach, we calculate the reflectivities, electric field distributions, and dispersion curves for surface phonon polaritons excited in the Otto geometry for selected model systems, where we observe several distinct phenomena ranging from critical coupling to mode splitting, and surface phonon polaritons in hyperbolic media

Second Harmonic Generation from Critically Coupled Surface Phonon Polaritons

Mid-infrared nanophotonics can be realized using sub-diffractional light localization and field enhancement with surface phonon polaritons in polar dielectric materials. We experimentally demonstrate second harmonic generation due to the optical field enhancement from critically coupled surface phonon polaritons at the 6H-SiC-air interface, employing an infrared free-electron laser for intense, tunable, and narrowband mid-infrared excitation. Critical coupling to the surface polaritons is achieved using a prism in the Otto geometry with adjustable width of the air gap, providing full control over the excitation conditions along the polariton dispersion. The calculated reflectivity and second harmonic spectra reproduce the full experimental data set with high accuracy, allowing for a quantification of the optical field enhancement. We also reveal the mechanism for low out-coupling efficiency of the second harmonic light in the Otto geometry. Perspectives on surface phonon polariton-based nonlinear sensing and nonlinear waveguide coupling are discussed

The Communist Party of Czechoslovakia in the Jablonec nad Nisou Region in 1968-1969

katedra: KHI; přílohy: 1 CD; rozsah: 83 s.PASSLER, Jindřich. The Communist Party of Czechoslovakia in the district in the years 1968 - 1969: Bachelor's thesis. Liberec: Technical University of Liberec, Faculty of Sciences, Humanities and Education, 2012. 76 pp., Annex II.The present work deals with the district organizations of the Communist Party of Czechoslovakia in Jablonec nad Nisou between 1968 and 1969. It deals mainly with the activities of the Bureau of the District Committee and District Committee itself. The activities of the Bureau and the Committee and the performances of individual members of these bodies can monitor conditions in the release of the first half of 1968 (of course, but some members disagree with the gradual release), tension and spontaneity in August 1968 and the progressive normalization of the (conservative district in the current organization came fully into power in mid-1969).PASSLER, Jindřich. Komunistická strana Československa v okrese Jablonec nad Nisou v letech 1968 ? 1969: bakalářská práce. Liberec: Technická univerzita Liberec, Fakulta přírodovědně-humanitní a pedagogická, 2012. 76 s., II přílohy. Předkládaná práce se zabývá Okresní organizací Komunistické strany Československa v Jablonci nad Nisou v letech 1968 a 1969, hlavně činností předsednictva okresního výboru i samotného okresního výboru. Na činnosti předsednictva a výboru i ve vystoupeních jednotlivých členů těchto orgánů můžeme sledovat uvolňování poměrů v první polovině roku 1968 (samozřejmě ale někteří členové s postupným uvolňováním nesouhlasí), napětí i živelnost v srpnových dnech roku 1968 a také postupující normalizaci (konzervativní proud v okresní organizaci se dostal plně k moci v polovině roku 1969)

Second Harmonic Generation from Phononic Epsilon-Near-Zero Berreman Modes in Ultrathin Polar Crystal Films

Immense optical field enhancement was predicted to occur for the Berreman mode in ultrathin films at frequencies in the vicinity of epsilon near zero (ENZ). Here, we report the first experimental proof of this prediction in the mid-infrared by probing the resonantly enhanced second harmonic generation (SHG) at the longitudinal optic phonon frequency from a deeply subwavelength-thin aluminum nitride (AlN) film. Employing a transfer matrix formalism, we show that the field enhancement is completely localized inside the AlN layer, revealing that the observed SHG signal of the Berreman mode is solely generated in the AlN film. Our results demonstrate that ENZ Berreman modes in intrinsically low-loss polar dielectric crystals constitute a promising platform for nonlinear nanophotonic applications

Theory of enhanced dynamical photo-thermal bi-stability effects in cuprous oxide/organic hybrid heterostructure

We theoretically demonstrate the formation of multiple bi-stability regions in the temperature pattern on the interface between a cuprous oxide quantum well and DCM2:CA:PS organic compound. The Frenkel molecular exciton of the DCM2 is brought into resonance with the $1S$ quadrupole Wannier-Mott exciton in the cuprous oxide by "solvatochromism" with CA. The resulting hybrid is thermalized with surrounding helium bath. This leads to strongly non-linear temperature dependence of the laser field detuning from the quadrupole exciton energy band which is associated with the temperature induced red shift of the Wannier exciton energy. Numerical up and down-scan for the detuning reveals hysteresis-like temperature distribution. The obtained \emph{multiple} bi-stability regions are at least three orders of magnitude bigger ($meV$) than the experimentally observed bi-stability in bulk cuprous oxide ($\mu eV$). The effective absorption curve exhibits highly asymmetrical behavior for the Frenkel-like (above the $1S$ energy) and Wannier-like (below the $1S$ energy) branches of the hybrid.Comment: 6 pages, 7 Figure