In the Rapid Research Letter on p. 242 ff., titania nanotubes are proposed as building blocks of focusing elements. The design of photonic crystal (PC) - in particular concave - lenses on the basis of metallized nanotubes is found to result in excellent focusing of visible electromagnetic radiation. The lenses prove to be tolerant to disorder in the spatial arrangement of the nanotubes. Moreover, some disorder is even shown to improve the focusing properties.
La 12 iunie curent, comunitatea stiintifica a marcat cea de-a 62-a aniversare de la fondarea primelor institutii de tip academic. De aceasta data Consiliul Suprem pentru Stiinta si Dezvoltare Tehnologica al A.S.M. a programat citeva actiunii pentru aceasta zi. De dimineata mass-media a fost prezenta la Centrul national de studiu si testare a materialelor din cadrul Universitatii Tehnice a Moldovei, caruia ambasadorul extraordinar si plenipotentiar al Republicii Federale Germania in Republica Moldova, Excelenta sa dl Nikolaus von der Wenge, Graful Lambsdorff, i-a transmis un set de utilaj din partea Fundatiei "Alexander von Humboldt" din Germania. E vorba de un sistem performant de laser, in valoare de 20 mii de euro, odata cu punerea in functiune a caruia va spori, indiscutabil, nivelul tehnologic si de caracterizare a materialelor electronice si fotonice in acest centru cu impact pozitiv asupra dezvoltarii stiintei si a pregatirii cadrelor tinere. Deci, sarbatoarea nu a trecut fara de un cadou pretios.
A new, simple technique to produce ordered arrays of metal nanotubes has been developed by scientists in Moldova. The method works by electroplating in conductive nanotemplates routinely fabricated by anodic etching of semiconductor substrates in salty water. The result could be important for making plasmonic devices, photonic crystals, catalysts for energy conversion and chemical and biological sensors.