Plasmonic Split-Trench Resonator for Trapping and Sensing
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Author/Creator ORCID
Date
2021-03-31
Type of Work
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Citation of Original Publication
Daehan Yoo, Avijit Barik, Fernando de León-Pérez, Daniel A. Mohr, Matthew Pelton, Luis Martín-Moreno, and Sang-Hyun Oh. Plasmonic Split-Trench Resonator for Trapping and Sensing. Plasmonic Split-Trench Resonator for Trapping and Sensing
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This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in ACS Nano, copyright © American Chemical Society after peer review. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acsnano.0c10014
Subjects
Abstract
On-chip integration of plasmonics and electronics can benefit a broad range of applications in biosensing, signal processing, and optoelectronics. A key requirement is a chip-scale manufacturing method. Here, we demonstrate a split-trench resonator platform that combines a high-quality-factor resonant plasmonic biosensor with radio frequency (RF) nanogap tweezers. The split-trench resonator can simultaneously serve as a dielectrophoretic trap and a nanoplasmonic sensor. Trapping is accomplished by applying an RF electrical bias across a 10 nm gap, thereby either attracting or repelling analytes. Trapped analytes are detected in a label-free manner using refractive-index sensing, enabled by interference between surface-plasmon standing waves in the trench and light transmitted through the gap. This active sample concentration mechanism enables detection of nanoparticles and proteins at a concentration as low as 10 pM. We can manufacture centimeter-long split-trench cavity resonators with high throughput via photolithography and atomic layer deposition, toward practical applications in biosensing, spectroscopy, and optoelectronics.