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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 35, Iss. 1 — Jan. 1, 1996
  • pp: 126–130

Confocal theta fluorescence microscopy with annular apertures

Steffen Lindek, Christoph Cremer, and Ernst H. K. Stelzer  »View Author Affiliations


Applied Optics, Vol. 35, Issue 1, pp. 126-130 (1996)
http://dx.doi.org/10.1364/AO.35.000126


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Abstract

In a confocal theta fluorescence microscope, two objective lenses with circular apertures are used, one to illuminate the sample and the other to detect the emitted light at an angle to the illumination axis. We show that annular illumination and detection apertures lead to a reduction in the extent of the point-spread function. A spatial resolution improved by more than 50% can be achieved with a central obstruction blocking the inner 80% of the diameter. For the limit of a very narrow annular aperture and a numerical aperture of 0.75, the volume at half-maximum of the point-spread function is reduced from 15 to 5 aL. A mixed setup with an annular illumination aperture and a circular detection aperture is also considered.

© 1996 Optical Society of America

History
Original Manuscript: March 20, 1995
Revised Manuscript: September 7, 1995
Published: January 1, 1996

Citation
Steffen Lindek, Christoph Cremer, and Ernst H. K. Stelzer, "Confocal theta fluorescence microscopy with annular apertures," Appl. Opt. 35, 126-130 (1996)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-35-1-126


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References

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