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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 13 — Jun. 23, 2008
  • pp: 9907–9917

Tight focusing of laser beams in a λ/2-microcavity

Dmitry Khoptyar, Raphael Gutbrod, Anna Chizhik, Jörg Enderlein, Frank Schleifenbaum, Mathias Steiner, and Alfred J. Meixner  »View Author Affiliations

Optics Express, Vol. 16, Issue 13, pp. 9907-9917 (2008)

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We evaluate the field distribution in the focal spot of the fundamental Gaussian beam as well as radially and azimuthally polarized doughnut beams focused inside a planar metallic sub-wavelength microcavity using a high numerical aperture objective lens. We show that focusing in the cavity results in a much tighter focal spot in longitudinal direction compared to free space and in spatial discrimination between longitudinal and in-plane field components. In order to verify the modeling results we experimentally monitor excitation patterns of fluorescence beads inside the λ/2-cavity and find them in full agreement to the modeling predictions. We discuss the implications of the results for cavity assisted single molecular spectroscopy and intra-cavity single molecular imaging.

© 2008 Optical Society of America

OCIS Codes
(110.0180) Imaging systems : Microscopy
(180.1790) Microscopy : Confocal microscopy
(180.2520) Microscopy : Fluorescence microscopy
(260.1960) Physical optics : Diffraction theory

ToC Category:

Original Manuscript: March 20, 2008
Revised Manuscript: May 16, 2008
Manuscript Accepted: May 16, 2008
Published: June 20, 2008

Virtual Issues
Vol. 3, Iss. 7 Virtual Journal for Biomedical Optics

Dmitry Khoptyar, Raphael Gutbrod, Anna Chizhik, Jörg Enderlein, Frank Schleifenbaum, Mathias Steiner, and Alfred J. Meixner, "Tight focusing of laser beams in a λ/2-microcavity," Opt. Express 16, 9907-9917 (2008)

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