Stiffer optical tweezers through real-time feedback control

Anders E. Wallin; Heikki Ojala; Edward Hæggström; Roman Tuma

doi:10.1063/1.2940339

Stiffer optical tweezers through real-time feedback control

Anders E. Wallin (Corresponding Author), Heikki Ojala, Edward Hæggström, Roman Tuma

Not published at VTT

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Abstract

Using real-time re-programmable signal processing we connect acousto-optic steering and back-focal-plane interferometric position detection in optical tweezers to create a fast feedback controlled instrument. When trapping 3𝜇m latex beads in water we find that proportional-gain position-clamping increases the effective lateral trap stiffness ∼13-fold. A theoretical power spectrum for bead fluctuations during position-clamped trapping is derived and agrees with the experimental data. The loop delay, ∼19𝜇s in our experiment, limits the maximum achievable effective trap stiffness.

Original language	English
Pages (from-to)	224104
Journal	Applied Physics Letters
Volume	92
Issue number	22
DOIs	https://doi.org/10.1063/1.2940339
Publication status	Published - 2 Jun 2008
MoE publication type	A1 Journal article-refereed

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10.1063/1.2940339

Cite this

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abstract = "Using real-time re-programmable signal processing we connect acousto-optic steering and back-focal-plane interferometric position detection in optical tweezers to create a fast feedback controlled instrument. When trapping 3휇m latex beads in water we find that proportional-gain position-clamping increases the effective lateral trap stiffness ∼13-fold. A theoretical power spectrum for bead fluctuations during position-clamped trapping is derived and agrees with the experimental data. The loop delay, ∼19휇s in our experiment, limits the maximum achievable effective trap stiffness.",

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AU - Hæggström, Edward

AU - Tuma, Roman

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N2 - Using real-time re-programmable signal processing we connect acousto-optic steering and back-focal-plane interferometric position detection in optical tweezers to create a fast feedback controlled instrument. When trapping 3휇m latex beads in water we find that proportional-gain position-clamping increases the effective lateral trap stiffness ∼13-fold. A theoretical power spectrum for bead fluctuations during position-clamped trapping is derived and agrees with the experimental data. The loop delay, ∼19휇s in our experiment, limits the maximum achievable effective trap stiffness.

AB - Using real-time re-programmable signal processing we connect acousto-optic steering and back-focal-plane interferometric position detection in optical tweezers to create a fast feedback controlled instrument. When trapping 3휇m latex beads in water we find that proportional-gain position-clamping increases the effective lateral trap stiffness ∼13-fold. A theoretical power spectrum for bead fluctuations during position-clamped trapping is derived and agrees with the experimental data. The loop delay, ∼19휇s in our experiment, limits the maximum achievable effective trap stiffness.

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M3 - Article

SN - 0003-6951

VL - 92

SP - 224104

JO - Applied Physics Letters

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Stiffer optical tweezers through real-time feedback control

Abstract

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