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. 2015 Jun 15;5:10610. doi: 10.1038/srep10610

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(a) Normalized optical force detected by AFM tips coated with different metals while measuring a 30 nm Au particle with incident light at 660 nm in the |E_z| incident field of different permittivity of the tip calculated by COMSOL (b) Model used in numerical calculations with elliptical gold nanoparticle scanning over the 500 nm gold nanorod. (c) line scan of normalized optical force of different tip permittivity at 580 nm wavelength on 500 nm gold nano rod in the |Ex| incident field calculated by COMSOL, which shows the experiment setup can measure the Fabry-Perot mode of the gold nano rod.