Abstract

Gold nanoparticles (GNPs) are very often used as handles for nanotechnological micromanipulation. In this regard, optical trapping of GNPs is of great importance, in which locating the trapped GNP within the focal spot with nanometer precision is crucial. Very recently, we have introduced a new position detection system for optical tweezers based on moiré deflectometry (MD). Here we show, both theoretically and experimentally, that an MD detection system could provide significantly larger detection sensitivity for a trapped GNP compared to that provided by conventional back focal plane (BFP) detection systems. For instance, for a trapped 200 nm GNP, the detection sensitivity provided by the MD detection method is 280% better than that provided by the BFP detection method.

© 2021 Optical Society of America

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Supplementary Material (2)

NameDescription
Visualization 1       Visualization 1 shows a typical experimental moiré pattern when the optical trap is empty. The red overlaid graph shows the intensity level averaged over the vertical pixel lines along the moiré fringes.
Visualization 2       Visualization 2 shows a typical experimental moiré pattern when the optical trap is occupied with a 200nm GNP. The blue overlaid graph shows the intensity level averaged over the vertical pixel lines along the moiré fringes.

Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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