Autoenhanced Raman Spectroscopy via Plasmonic Trapping for Molecular Sensing

Soonwoo Hong, On Shim, Hyosung Kwon, Yeonho Choi

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

As a label-free and sensitive biosensor, surface-enhanced Raman spectroscopy (SERS) is a rapidly emerging technique. However, because SERS spectra are obtained in the area of light excitation and the enhancement effect can be varied depending on the position of a substrate, it is important to match the enhanced area with an illuminated spot. Here, in order to overcome such difficulty, we demonstrated a new technique combining SERS with plasmonic trapping. By plasmonic trapping, we can collect gold nanoparticles (GNPs) in the middle of initially fabricated nanobowtie structures where a laser is excited. As a result of trapping GNPs, hot-spots are formed at that area. Because SERS is measured in the area irradiated by a laser, hot-spot can be simultaneously coincided with a detection site for SERS. By using this, we detected Rhodamine 6G to 100 pM. To further verify and improve the reproducibility of our technique, we also calculated the electric field distribution, trapping force and trapping potential.

Original languageEnglish
Pages (from-to)7633-7638
Number of pages6
JournalAnalytical Chemistry
Volume88
Issue number15
DOIs
Publication statusPublished - 2016 Aug 2

ASJC Scopus subject areas

  • Analytical Chemistry

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