A Common-Path Interferometer for Time-Resolved and Shot-Noise-Limited Detection of Single Nanoparticles

We give a detailed description of a novel method for time-resolved experiments on single non-luminescent nanoparticles. The method is based on the combination of pump-probe spectroscopy and a common-path interferometer. In our interferometer, probe and reference arms are separated in time and polarization by a birefringent crystal. The interferometer, fully described by an analytical model, allows us to separately detect the real and imaginary contributions to the signal. We demonstrate the possibilities of the setup by time-resolved detection of single gold nanoparticles as small as 10 nm in diameter, and of acoustic oscillations of particles larger than 40 nm in diameter

Three Early Byzantine Ornaments

"Silver and gold jewelry played an important role in the expansion of Roman / Late Antique metalworking techniques and in the decorative repertoire of Byzantine art. An interesting group of Byzantine jewelry -- two silver bracelets and a gold medallion -- formed an important addition to the collection when acquired by the Museum of Art and Archaeology in 1968. The three objects are said to have been found in a tomb in Hebron (Palestine)."--First paragraph.Includes bibliographical reference

Heilpädagogische Diagnostik. Zur wissenschaftlichen Stigmatisierung von Kindern und Jugendlichen, die an den Folgen von sexualisierter Gewalt litten

Der Beitrag beschäftigt sich mit struktureller, epistemischer und sexualisierter Gewalt an Kindern und Jugendlichen, die von der Jugendwohlfahrt in Österreich betreut wurden. Viele dieser Jugendlichen besuchten zugleich eine einrichtungsinterne Schule, in der sich die Gewalt fortsetzte, ebenso wurden viele bereits im Zuge der flächendeckenden Schuleingangsuntersuchungen mit Gewalt konfrontiert. Die vorliegenden Ergebnisse gehen zurück auf Forschungen im österreichischen Bundesland Kärnten. Da die Hauptakteure österreichweit agierten, sind die Ergebnisse des Forschungsprojektes – trotz seines Ausgangspunktes in Kärnten – nicht regional beschränkt. (DIPF/Orig.

The influence of cold rolling on the pore morphology and flow resistivity of porous aluminum

Materials with an open porosity are used in many applications, such as filters, acoustic absorbers or heat exchangers. For these applications the pore size and shape as well as the depending flow resistivity are important parameters and need to be adjusted for the specific case. The material parameters are usually defined by the manufacturing process and are therefore signature for different types of porous materials. In this study the porosity, pore shape and the depending flow resistivity of a given material are adjusted using a cold rolling process. The material chosen is a porous aluminum with a porosity of about 50% and relatively large pore, what allows to adjust pore size and porosity on large scale. Please download the full abstract below

Enhancing the optical excitation efficiency of a single self-assembled quantum dot with a plasmonic nanoantenna

We demonstrate how the controlled positioning of a plasmonic nanoparticle modifies the photoluminescence of a single epitaxial GaAs quantum dot. The antenna particle leads to an increase of the luminescence intensity by about a factor of eight. Spectrally and temporally resolved photoluminescence measurements prove an increase of the quantum dot's excitation rate. The combination of stable epitaxial quantum emitters and plasmonic nanostructures promises to be highly beneficial for nanoscience and quantum optics.Comment: 5 pages, 4 figure