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Science 21 September 2001:
Vol. 293. no. 5538, pp. 2217 - 2218
DOI: 10.1126/science.1065119
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Perspectives

APPLIED PHYSICS:
Optics in the Nano-World

S. W. Koch and A. Knorr

The invention of near-field scanning optical microscopy (NSOM) enabled the standard resolution limit for optical microscopy to be overcome, thus offering greatly improved spatial resolution. In their Perspective, Koch and Knorr highlight a new technique reported by Guest et al, which combines the high spatial resolution of NSOM with the high spectral resolution offered by coherent nonlinear optical spectroscopy. The authors demonstrate that the technique allows individual quantum states on a quantum dot to be resolved.

S. W. Koch is in the Department of Physics, Philipps University, 35032 Marburg, Germany. E-mail: stephan.w.koch{at}physik.uni-marburg.de A. Knorr is at the Institute for Theoretical Physics, Technical University, 10623 Berlin, Germany. E-mail: andreas.knorr{at}physik.tu-berlin.de

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Science. ISSN 0036-8075 (print), 1095-9203 (online)