Phys. Rev. Lett. 85, 3029–3032 (2000)Complex Optical Constants on a Subwavelength ScaleReceived 7 April 2000; published in the issue dated 2 October 2000 Optical phase contrast has for the first time been observed on a nanometer scale, with a near-field microscope of scattering type that maps the complete optical field of amplitude and phase. Backed by quasielectrostatic theory, we demonstrate the significance and experimental accessibility of even complex optical constants on a subwavelength scale. Further, our method can separate the near-field response from background artifacts and thus is expected to enable nanoscale optical mapping of even topography-rich objects such as resonant clusters and macromolecules. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.3029
DOI:
10.1103/PhysRevLett.85.3029
PACS:
77.22.-d, 07.79.Fc, 78.20.Ci
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