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Optics Letters

Optics Letters


  • Vol. 25, Iss. 3 — Feb. 1, 2000
  • pp: 171–173

Multipole analysis of the radiation from near-field optical probes

D. J. Shin, A. Chavez-Pirson, and Y. H. Lee  »View Author Affiliations

Optics Letters, Vol. 25, Issue 3, pp. 171-173 (2000)

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We experimentally and theoretically analyze the radiation emitted from subwavelength-sized apertures in near-field optical probes. By decomposing the experimentally obtained radiation patterns into vector spherical waves, we describe the fields in terms of a series of multipole sources. We fit polarization-resolved angular intensity distributions, measured as far as 150° from the normal, with dipole, quadrupole, and octupole radiation. We find that the magnetic and the electric dipole components are dominant but that the interference terms between dipoles and higher-order poles are not negligible. This result can be used as the basis for understanding near-field optical interactions and images.

© 2000 Optical Society of America

OCIS Codes
(180.5810) Microscopy : Scanning microscopy
(260.1960) Physical optics : Diffraction theory

D. J. Shin, A. Chavez-Pirson, and Y. H. Lee, "Multipole analysis of the radiation from near-field optical probes," Opt. Lett. 25, 171-173 (2000)

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