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Applied Optics

Applied Optics


  • Vol. 42, Iss. 19 — Jul. 1, 2003
  • pp: 3915–3926

Influence of a Glass-Water Interface on the On-Axis Trapping of Micrometer-Sized Spherical Objects by Optical Tweezers

Erik Fällman and Ove Axner  »View Author Affiliations

Applied Optics, Vol. 42, Issue 19, pp. 3915-3926 (2003)

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A systematic study of the influence of a glass-water interface on the on-axis trapping of micrometer-sized spherical objects by optical tweezers is presented. The ways in which the escape force and the trapping position, as well as the stiffness of the trap, depend on the focusing depth, the numerical aperture, and the degree of overfilling of the objective entrance pupil are investigated. It is concluded, among other things, that objectives with the highest numerical aperture and the use of large degrees of overfilling do not always provide the optimum trapping conditions at finite depths.

© 2003 Optical Society of America

OCIS Codes
(000.1430) General : Biology and medicine
(080.2710) Geometric optics : Inhomogeneous optical media
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.7010) Lasers and laser optics : Laser trapping
(180.0180) Microscopy : Microscopy

Erik Fällman and Ove Axner, "Influence of a Glass-Water Interface on the On-Axis Trapping of Micrometer-Sized Spherical Objects by Optical Tweezers," Appl. Opt. 42, 3915-3926 (2003)

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  32. Traditional aberration theory shows that spherical aberration is strongly dependent on the NA of an optical system. The longitudinal (also referred to as the axial) spherical aberration is proportional to NA2; whereas the spherical wave aberration is proportional to NA4. Optical tweezers, which utilize high-NA objectives to produce rays with large angles, are therefore particularly susceptible to this effect.
  33. There are also objectives that have provisions for adjustment of the spherical-aberration-free depth. However, such objectives are often costly and complicated and are therefore not common for optical tweezers applications. In addition, they contain a significant number of lenses, which also makes them less suitable for optical trapping.
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  36. E. Fällman and O. Axner are preparing the following paper for publication: “Comparison of on-axis trapping of optical traps under the influence of spherical aberration by objectives that adhere to the sin and tan conditions.”
  37. E. Fällman and O. Axner are preparing the following paper for publication: “The influence of a cover glass surface on the trapping of spherical objects by optical tweezers—The off-axis case.”

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