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Author: stephan stranick
Displaying records 11 to 20 of 37 records.
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11. Comparison of Nanoscale Measurements of Strain and Stress using
Electron Back Scattered Diffraction and Confocal Raman Microscopy
Mark D Vaudin, Yvonne Beatrice Gerbig, Stephan J Stranick, Robert Francis Cook
Strains in Si as small as 104 (corresponding to stresses of 10 MPa) have been measured using electron back scatter diffraction (EBSD), with spatial resolution close to 10 nm, and confocal Raman microscopy (CRM) with spatial resolution app ...
12. Sounds of Atoms: Life in Science
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 wh ...
13. Programmable Vector Point-Spread Function Engineering
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 ...
14. Chemical Imaging of Heterogeneous Polymeric Materials With Near-Field IR Microscopy
Chris A Michaels, D B Chase, Stephan J Stranick
The development of techniques to probe spatial variations in chemical composition on the nanoscale continues to be an important area of research in the characterization of polymeric materials. Recent efforts have focused on the development and chara ...
15. Horizontal Growth and In Situ Assembly of Oriented ZnO Nanowires
Babak Nikoobakht, Chris A Michaels, Mark D Vaudin, Stephan J Stranick
16. Horizontal Growth and In Situ Assembly of Oriented Zinc Oxide Nanowires
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 ...
17. Template Fabrication of Protein-Functionalized Gold-Polypyrrole-Gold Segmented Nanowires
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 st ...
18. Controlling The Growth Direction of ZnO Nanowires (NWs) on c and a -Plane Sapphire
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 horizont ...
19. Near-Field Vibrational Spectroscopy: Infrared and Raman Studies at High Spatial Resolution
Stephan J Stranick, D B Chase, Chris A Michaels
The ability to measure chemical bond changes on the nanometer scale is of critical importance for the characterization of catalytic materials, engineered materials and surfaces relevant to biological problems. In this paper, we will outline the deve ...
20. Modeling Illumination-Mode Near-Field Optical Microscopy of Au Nanoparticles
A Liu, A Rahmani, Garnett W Bryant, Lee J Richter, Stephan J Stranick
We present a theoretical analysis of near-field scanning optical microscopy (NSOM) images of small Au particles made in illumination mode. We model the metal-coated fiber tip as a thin disk consisting of a glass core and an aluminum coating. An ext ...