Acoustoelectric current transport through single-walled carbon nanotubes

We have contacted single-walled carbon nanotubes after aligning the tubes by the use of surface acoustic waves. The acoustoelectric current has been measured at 4.2 K and a probing of the low-dimensional electronic states by the surface acoustic wave has been detected. By decreasing the acoustic wavelength resulting in an adjustment to the length of the defined carbon nanotube constriction a quantization of the acoustoelectric current has been observed.Comment: submitted to PR

Fabrication of asymmetric multimode splitters in glass by planar ion exchange and laser ablation

The fabrication of planar lightwave circuits (PLC) using the laser-ablated ridge waveguide technique is explored. In particular, asymmetric multimode splitter structures are designed and fabricated. The experimental work is accompanied by modeling the relevant parameters. An ion exchange model determines a suitable set of ion exchange duration, temperature, electric field, and ridge geometry. In the simulation, special attention is paid to a good match of the waveguide shape between the PLC components and commercially available GRIN fibers. Wave-optical simulations of the light propagation in the PLC devices are performed using a scalar beam propagation method. Based on the simulation, asymmetric splitter devices are designed for a variety of splitting ratios. A 70:30 splitter is fabricated and attached to optical fibers for characterization. As indicated by a low excess loss, low intrinsic waveguide losses are achieved. The experimental splitting ratio is in good agreement with the simulation

Surface-acoustic-wave-enhanced alignment of thiolated carbon nanotubes on gold electrodes

Surface-acoustic-wave-enhanced alignment of thiolated carbon nanotubes on gold electrodes / J. Ebbecke … - In: Small. 12. 2005. S. 1188-119

Wettbewerb Excellence in Production zum Werkzeugbau des Jahres 2018

Im seit 2004 durchgeführten Wettbewerb Excellence in Production zum Werkzeugbau des Jahres werden jährlich die besten Werkzeugbaubetriebe im deutschsprachigen Raum verglichen und besonders leistungsfähige Betriebe ausgezeichnet. Der Wettbewerb ist damit ein aussagekräftiges Gütesiegel und ermöglicht teilnehmenden Werkzeugbaubetrieben die Identifizierung spezifischer Stärken und Verbesserungspotenziale