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Femtonewton force sensing with optically trapped nanotubes
O M Maragò1, P H Jones, F Bonaccorso
1CNR-Istituto per i Processi Chimico-Fisici, Salita Sperone C.da Papardo, I-98158 Messina, Italy.
Nano Letters
|September 5, 2008
Summary
We used optically trapped nanotubes to achieve unprecedented nanometer spatial and femtonewton force resolution in photonic force microscopy. This breakthrough offers significant advancements for nanotechnology and material science applications.
Area of Science:
- Physics
- Materials Science
- Nanotechnology
Background:
- Photonic force microscopy (PFM) is crucial for nanoscale measurements.
- Existing PFM techniques face limitations in spatial and force resolution.
Purpose of the Study:
- To develop a novel PFM method utilizing optically trapped nanotubes.
- To achieve record-breaking spatial and force resolution.
Main Methods:
- Three-dimensional tracking of optically trapped nanotubes.
- Analysis of center-of-mass and angular fluctuations.
- Measurement of optical force and torque constants via autocorrelation and cross-correlation.
Main Results:
- Isolated angular Brownian motion.
- Achieved nanometer spatial resolution.
- Achieved femtonewton force resolution, the smallest reported to date.
Conclusions:
- Optically trapped nanotubes significantly enhance PFM capabilities.
- The demonstrated resolution has broad implications for nanotechnology, biotechnology, nanofluidics, and material science.
