Abstract
We have investigated the plasmonic trapping of dielectric nanoparticles by using engineered gold nanoblock pairs with ~5-nm gaps. Pairs with surface-plasmon resonance peaks at the incident wavelength allow the trapping of 350-nm-diameter nanoparticles with 200 W/cm2 laser intensities, and their plasmon resonance properties and trapping performance are drastically modified by varying the nanoblock size of ~20%. In addition, plasmon resonance properties of nanoblock pairs strongly depend on the direction of the linear polarization of the incident laser, which determines the trapping performance.
Highlights
“Radiation force exerted on subwavelength particles near a nanoaperture,” Phys
“Nanometric optical tweezers based on nanostructured substrates,” Nat
“Optical trapping of quantum dots based on gap-mode-excitation of localized surface plasmon,” Phys
Summary
OCIS codes: (250.5403) Plasmonics; (350.4855) Optical manipulation; (290.5870) Scattering, Rayleigh. “Radiation force exerted on subwavelength particles near a nanoaperture,” Phys. Nieto-Vesperinas, “Optical trapping and manipulation of nano-objects with an apertureless probe,” Phys. S. Xie, “Theory of nanometric optical tweezers,” Phys.
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