Fiber-optic plasmonic probe with nanogap-rich Au nanoislands for on-site surface-enhanced Raman spectroscopy using repeated solid-state dewetting

Jihyun Kwak; Wonkyoung Lee; Jae-Beom Kim; Sang-In Bae; Ki-Hun Jeong

doi:10.1117/1.JBO.24.3.037001

14 March 2019 Fiber-optic plasmonic probe with nanogap-rich Au nanoislands for on-site surface-enhanced Raman spectroscopy using repeated solid-state dewetting

Jihyun Kwak, Wonkyoung Lee, Jae-Beom Kim, Sang-In Bae, Ki-Hun Jeong

Author Affiliations +

Journal of Biomedical Optics, Vol. 24, Issue 3, 037001 (March 2019). https://doi.org/10.1117/1.JBO.24.3.037001

Abstract

We report a fiber-optic plasmonic probe with nanogap-rich gold nanoislands for on-site surface-enhanced Raman spectroscopy (SERS). The plasmonic probe features nanogap-rich Au nanoislands on the top surface of a single multimode fiber. Au nanoislands were monolithically fabricated using repeated solid-state dewetting of thermally evaporated Au thin film. The plasmonic probe shows 7.8 × 10⁶ in SERS enhancement factor and 100 nM in limit-of-detection for crystal violet under both the excitation of laser light and the collection of SERS signals through the optical fiber. The fiber-through measurement also demonstrates the label-free SERS detection of folic acid at micromolar level. The plasmonic probe can provide a tool for on-site and in vivo SERS applications.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Jihyun Kwak, Wonkyoung Lee, Jae-Beom Kim, Sang-In Bae, and Ki-Hun Jeong "Fiber-optic plasmonic probe with nanogap-rich Au nanoislands for on-site surface-enhanced Raman spectroscopy using repeated solid-state dewetting," Journal of Biomedical Optics 24(3), 037001 (14 March 2019). https://doi.org/10.1117/1.JBO.24.3.037001

Received: 17 September 2018; Accepted: 2 January 2019; Published: 14 March 2019

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Cited by 18 scholarly publications and 2 patents.

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KEYWORDS

Gold

Plasmonics

Surface enhanced Raman spectroscopy

Dewetting

Fiber optics

Molecules

In vivo imaging

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