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Seeing in Color at the Nanoscale
A newly designed microscopy probe uses plasmonic enhancement to capture broadband spectroscopic data with sub-wavelength resolution
So-called "campanile" probe enables nanoscale spectroscopy, revealing details of light-to-electricity conversion and other chemical processes at atomic length-scales
- Light is channeled down a campanile-shaped optical fiber into a surface-plasmon-enhanced field at the tip
- In a modified atomic-force microscope, the probe delivers both a spatial map and an optical spectrum at each pixel in that map
- Probe revealed spatially varying optoelectronic properties in indium-phosphide nanowires, and showed how fabrication and surface treatments may alter the nanowires' photovoltaic properties
Wei Bao, M. Melli, N. Caselli, F. Riboli, D. S. Wiersma, M. Staffaroni, H. Choo, D. F. Ogletree, S. Aloni, J. Bokor, S. Cabrini, F. Intonti, M. B. Salmeron, E. Yablonovitch, P. J. Schuck, A. Weber-Bargioni. Science, in press (2012).