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Displaying 51 - 75 of 101

Measurement of residual stress field anisotropy at indentations in silicon

June 23, 2010
Author(s)
Yvonne B. Gerbig, Stephan J. Stranick, Robert F. Cook
The residual stress field around spherical indentations on single crystal silicon (Si) of different crystallographic orientation is mapped by confocal Raman microscopy. All orientations exhibit an anisotropic stress pattern with an orientation specific

Sounds of Atoms: Life in Science

October 10, 2008
Author(s)
Stephan J. Stranick
Early in setting up our nanoscience laboratory at Penn State, we were frustrated because we could not peer into the tunneling junctions of our scanning tunneling microscopes (STMs) to see what the atoms were doing. We were particularly vexed when singular

Programmable Vector Point-Spread Function Engineering

April 1, 2006
Author(s)
M R. Beversluis, L Novotny, Stephan J. Stranick
We use a nematic liquid crystal spatial light modulator (SLM) to control the vector point spread function of a microscope objective by manipulating the pupil field polarization. In combination with an achromatic quarter-wave plate, the SLM acts as a

Horizontal Growth and In Situ Assembly of Oriented Zinc Oxide Nanowires

October 1, 2004
Author(s)
Babak Nikoobakht, Chris A. Michaels, Stephan J. Stranick, Mark D. Vaudin
The positioning and directed assembly of semiconductor nanowires (NWs) is of considerable current interest for bottom-up approaches to the engineering of intricate structures from nanoscale building blocks. We report a horizontal growth mode for ZnO NWs on

Template Fabrication of Protein-Functionalized Gold-Polypyrrole-Gold Segmented Nanowires

September 1, 2004
Author(s)
R M. Hernandez, Lee J. Richter, Stephen Semancik, Stephan J. Stranick, Thomas E. Mallouk
Gold nanowires containing protein-modified poly(pyrrole) (Ppy) junctions were synthesized electrochemically using porous aluminum oxide as a template. The effects of the conditions of electrochemical synthesis on Ppy growth and protein (avidin or

Controlling The Growth Direction of ZnO Nanowires (NWs) on c and a -Plane Sapphire

February 1, 2004
Author(s)
Babak Nikoobakht, Albert Davydov, Stephan J. Stranick
The issue of controlling the growth direction of NWs is vital in nanotechnology applications and future optoelectronic devices. In an effort to address the above, we have begun studies aimed at selectively controlling the growth direction of horizontal