Vertical plasmonic nanowires for 3D nanoparticle trapping

Jingzhi Wu; Xiaosong Gan

doi:10.1117/12.905229

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23 December 2011 Vertical plasmonic nanowires for 3D nanoparticle trapping

Jingzhi Wu, Xiaosong Gan

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Proceedings Volume 8204, Smart Nano-Micro Materials and Devices; 82040T (2011) https://doi.org/10.1117/12.905229
Event: SPIE Smart Nano + Micro Materials and Devices, 2011, Melbourne, Australia

Abstract

Nanoparticle trapping is considered to be more challenging than trapping micron-sized objects because of the diffraction limit of light and the severe Brownian motion of the nanoparticles. We introduce a nanoparticle trapping approach based on plasmonic nanostructures, which consist of nanopillars with high aspect ratio. The plasmonic nanopillars behave as plasmonic resonators that rely on paired nano-pillars supporting gap plasmon modes. The localized surface plasmon resonance effect provides strong electromagnetic field enhancement and enables confinement of nanoparticles in three dimensional space. Numerical simulations indicate that the plasmonic structure provides stronger optical forces for trapping nanoparticles. The study of thermal effect of the plasmonic structure shows that the impact of the thermal force is significant, which may determine the outcome of the nanoparticle trapping.

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Jingzhi Wu and Xiaosong Gan "Vertical plasmonic nanowires for 3D nanoparticle trapping", Proc. SPIE 8204, Smart Nano-Micro Materials and Devices, 82040T (23 December 2011); https://doi.org/10.1117/12.905229

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