Trapping particles using waveguide-coupled gold bowtie plasmonic tweezers

Pin Tso Lin, Heng Yi Chu, Tsan Wen Lu, Po Tsung Lee*

*Corresponding author for this work

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

We propose and demonstrate a trapping configuration integrating coupled waveguides and gold bowtie structures to form near-field plasmonic tweezers. Compared with excitation from the top, waves coupled through the waveguide can excite specific bowties on the waveguide and trap particles precisely. Thus this scheme is more efficient and compact, and will assist the circuit design on a chip. With lightning rod and gap effects, the gold bowtie structures can generate highly concentrated resonant fields and induce trapping forces as strong as 652 pN W -1 on particles with diameters as small as 20 nm. This trapping capability is investigated numerically and verified experimentally with observations of the transport, trapping, and release of particles in the system.

Original languageEnglish
Pages (from-to)4647-4652
Number of pages6
JournalLab on a Chip
Volume14
Issue number24
DOIs
StatePublished - 21 Dec 2014

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