Far-field optical microscope with nanometer-scale resolution based on in-plane surface plasmon imaging

Details Far-field optical microscope with nanometer-scale resolution based on in-plane surface plasmon imaging Far-field optical microscope with nanometer-scale resolution based on in-plane surface plasmon imaging

2004-05-05

arxiv.org/abs/cond-mat/0405098v2

Journal of Optics A: Pure and Applied Optics 7, S165-S175 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

23 pages, 9 figures, will be published in the topical issue on Nanostructured Optical Metamaterials of the Journal of Optics A

Scientific paper

10.1088/1464-4258/7/2/022

A new far-field optical microscopy technique capable of reaching nanometer-scale resolution has been developed recently using the in-plane image magnification by surface plasmon polaritons. This microscopy is based on the optical properties of a metal-dielectric interface that may, in principle, provide extremely large values of the effective refractive index n up to 100-1000 as seen by the surface plasmons. Thus, the theoretical diffraction limit on resolution becomes lambda/2n, and falls into the nanometer-scale range. The experimental realization of the microscope has demonstrated the optical resolution better than 50 nm for 502 nm illumination wavelength. However, the theory of such surface plasmon-based far-field microscope presented so far gives an oversimplified picture of its operation. For example, the imaginary part of the metal dielectric constant severely limits the surface-plasmon propagation and the shortest attainable wavelength in most cases, which in turn limits the microscope magnification. Here I describe how this limitation has been overcome in the experiment, and analyze the practical limits on the surface plasmon microscope resolution. In addition, I present more experimental results, which strongly support the conclusion of extremely high spatial resolution of the surface plasmon microscope.

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