Journal
OPTICS EXPRESS
Volume 22, Issue 19, Pages 23661-23672Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.023661
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Funding
- University of Copenhagen Excellence Program
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Multiple-beam optical traps facilitate advanced trapping geometries and exciting discoveries. However, the increased manipulation capabilities come at the price of more challenging position and force detection. Due to unrivaled bandwidth and resolution, photodiode based detection is preferred over camera based detection in most single/dual-beam optical traps assays. However, it has not been trivial to implement photodiode based detection for multiple-beam optical traps. Here, we present a simple and efficient method based on spatial filtering for parallel photodiode detection of multiple traps. The technique enables fast and accurate 3D force and distance detection of multiple objects simultaneously manipulated by multiple-beam optical tweezers. (C) 2014 Optical Society of America
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