Low-power nano-optical vortex trapping via plasmonic diabolo nanoantennas

Ju Hyung Kang, Kipom Kim, Ho Seok Ee, Yong Hee Lee, Tae Young Yoon, Min Kyo Seo, Hong Gyu Park

Research output: Contribution to journalArticle

82 Citations (Scopus)

Abstract

Optical vortex trapping can allow the capture and manipulation of micro-and nanometre-sized objects such as damageable biological particles or particles with a refractive index lower than the surrounding material. However, the quest for nanometric optical vortex trapping that overcomes the diffraction limit remains. Here we demonstrate the first experimental implementation of low-power nano-optical vortex trapping using plasmonic resonance in gold diabolo nanoantennas. The vortex trapping potential was formed with a minimum at 170 nm from the central local maximum, and allowed polystyrene nanoparticles in water to be trapped strongly at the boundary of the nanoantenna. Furthermore, a large radial trapping stiffness, ∼0.69 pN nm-1 W-1, was measured at the position of the minimum potential, showing good agreement with numerical simulations. This subwavelength-scale nanoantenna system capable of low-power trapping represents a significant step toward versatile, efficient nano-optical manipulations in lab-on-a-chip devices.

Original languageEnglish
Article number582
JournalNature communications
Volume2
Issue number1
DOIs
Publication statusPublished - 2011

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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