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Positioning Accuracy in Holographic Optical Traps.

Frederic Català-Castro^1,2, Estela Martín-Badosa^1,2

¹Optical Trapping Lab, Grup de Biofotònica (BiOPT), Departament de Física Aplicada, Universitat de Barcelona, 08028 Barcelona, Spain.

|June 2, 2021

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Spatial light modulators (SLMs) used in optical tweezers can introduce positioning errors up to 2 nm due to their digital structure. A new correction strategy reduces these errors to 0.3 nm, improving trap accuracy.

Area of Science:

Optical physics
Nanotechnology
Biophysics

Background:

Spatial light modulators (SLMs) are crucial for dynamic control of optical traps.
Holographic optical tweezers are often assumed to offer sub-nanometer positioning accuracy.
The impact of SLM digital features on trap positioning accuracy is not well understood.

Purpose of the Study:

To analyze the effects of SLM digitalization on optical trap positioning accuracy.
To quantify positioning errors caused by SLM look-up-tables and phase quantization.
To develop and validate a correction strategy for improving positioning accuracy.

Main Methods:

Tracking optically trapped microspheres with sub-nanometer accuracy.
Investigating positioning deviations related to SLM look-up-table power dependence.

Keywords:

holographic optical tweezers laser trapping spatial light modulators

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Analyzing errors introduced by phase quantization in linear phase gratings.

Main Results:

SLM look-up-tables cause positioning deviations up to 2 nm at the micron scale.
Phase quantization introduces local errors in steering angle.
A developed correction strategy reduced positioning errors to 0.3 nm.

Conclusions:

SLM digital features significantly impact optical trap positioning accuracy.
Understanding and correcting these errors is vital for high-precision optical trapping.
The implemented correction strategy offers a viable solution for enhancing nanometer-scale positioning control.