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Optics Letters

Optics Letters


  • Vol. 28, Iss. 6 — Mar. 15, 2003
  • pp: 465–467

Dynamic axial-position control of a laser-trapped particle by wave-front modification

Taisuke Ota, Satoshi Kawata, Tadao Sugiura, Martin J. Booth, Mark A. A. Neil, Rimas Juškaitis, and Tony Wilson  »View Author Affiliations

Optics Letters, Vol. 28, Issue 6, pp. 465-467 (2003)

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The axial position of a laser-trapped particle has been controlled by modification of the wave front by means of a membrane deformable mirror. The mirror gives wave-front modulation in terms of Zernike polynomials. By modulation of the Zernike defocus term we can modulate the particle position under conditions of laser trapping. A polystyrene particle of 1-μm diameter was moved along the optical axis direction for a distance of 2370 nm in minimum steps of 55.4 nm. We also demonstrated particle oscillation along the optical axis by changing the focal position in a sinusoidal manner. From the frequency dependency of the amplitude of particle oscillation we determined the spring constant as 91.7nN/m .

© 2003 Optical Society of America

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(140.7010) Lasers and laser optics : Laser trapping

Taisuke Ota, Satoshi Kawata, Tadao Sugiura, Martin J. Booth, Mark A. A. Neil, Rimas Juškaitis, and Tony Wilson, "Dynamic axial-position control of a laser-trapped particle by wave-front modification," Opt. Lett. 28, 465-467 (2003)

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