Enabling Self-Induced Back-Action Trapping of Gold Nanoparticles in Metamaterial Plasmonic Tweezers.

Although the behavior is quite complex, an increasing trend of the trap stiffness with increasing incident laser power is observed for the wavelengths 920–928 nm for both hotspots ( Figure 5 a,b).

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An interesting behavior is observed, where the trap stiffnesses around Hotspot 1 increases as we scan the excitation wavelength from 920–930 nm, but a decreasing trend is observed for the stiffnesses around Hotspot 2.

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