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Optical Trapping in Air of an Individual Nanotube-Sphere Device
Published
Author(s)
Andrew J. Slifka, Gurpreet Singh, Paul Rice, Damian S. Lauria, Roop Mahajan
Abstract
We demonstrate the optical manipulation of a polystyrene bead in air attached to an individual carbon nanotube. In continuation of our previous work [1] we have also utilized this technique to demonstrate the calibration of a nanotube-sphere (NT-sphere) mechanical force sensor in the pN force range. The bead was trapped using a focused 1.064 μm IR laser operated at 100 mW power. The device fabrication was carried out using a micromanipulator inside a scanning electron microscope. This simple device acts as a micro-cantilever beam and consists of a tungsten probe with a long nanotube (length l ≥15 μm) attached to its tip, while the other end of the nanotube supports a polystyrene microsphere. Decreasing the nanotube length to 8 μm did not show any sphere motion in the trap, indicating that this force sensor calibration technique will only work for a very low range of forces (pN or fN).
force calibration, nanotube, optical trap, piconewton force
Citation
Slifka, A.
, Singh, G.
, Rice, P.
, Lauria, D.
and Mahajan, R.
(2012),
Optical Trapping in Air of an Individual Nanotube-Sphere Device, Optics Letters, [online], https://doi.org/10.1143/APEX.5.095001
(Accessed October 8, 2025)