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The paper discusses an experimental demonstration of Bloch oscillations connected with Bragg reflection of electrons from the first miniband edge in superlattices of different silicon carbide polytypes. The original experimental method was geared towards o ...
Reflection, transmission and loss filters based on fiber Bragg gratings are key components in future wavelength division multiplexing telecommunication networks. A shift of the Bragg wavelength, λg, can be achieved by applying a strain or heating th ...
The ideal magnetohydrodynamic stability with respect to localized ballooning modes and the Mercier criterion of a quasihelically symmetric stellarator configuration is investigated. Configurations with an enhanced magnetic mirror and a deeper magnetic well ...
We develop a general quantum mechanical method to calculate the dispersion relations of polariton modes for a quantum well embedded in a semiconductor planar microcavity. The method is based on the properties of the Green's function;of the electromagnetic ...
The system of one or several quantum wells embedded in a planar semiconductor Fabry-Perot microcavity with distributed Bragg reflectors is studied in the framework of both a semiclassical and a full quantum theory. The results obtained with the two treatme ...
Pb(Zr0.70Ti0.30)O-3 rhombohedral thin films of (100), (110)/(111) and (111) textures were prepared on Si wafers with Ti/Pt electrodes. Microstructures and textures were characterized by XRD, SEM, TEM, and AFM. Ferroelectric, dielectric and fatigue properti ...
Sol-gel derived lead zirconate titanate (PZT) thin films are being investigated for micromechanical applications. A synthesis technique which involves the spin coating of several thin layers followed by rapid thermal annealing to crystallize the perovskite ...
A quantum-mechanical model for quantum well polaritons in semiconductor microcavities is presented. The real and imaginary parts of the polariton dispersion are obtained. They represent, respectively, the position and the linewidth of the luminescence peak ...
The results of round-robin measurements of waveguide loss and integrated mirror reflectivity in several European laboratories in the frame of the COST 240 project are presented. The Fabry-Perot cavity contrast method was used on semiconductor optical waveg ...
Pyroelectric PbTiO3 thin films devices with two temperature compensating elements on a SiO2/Si3N4 membranes have been fabricated and characterized. The measured voltage responsivity as a function of radiation modulation frequency has been compared to finit ...
