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Broadband Nanoscale Surface-Enhanced Raman Spectroscopy by Multiresonant Nanolaminate Plasmonic Nanocavities on Vertical Nanopillars

Published

Author(s)

Meitong Nie, Yuming Zhao, Wonil Nam, Junyeob Song, Wenqi Zhu, Henri Lezec, Amit Agrawal, Wei Zhou

Abstract

Surface-enhanced Raman spectroscopy (SERS) has become a sensitive detection technique for biochemical analysis. Despite significant research efforts, most SERS substrates consisting of single-resonant plasmonic nanostructures on the planar surface suffer from limitations of narrowband SERS operation and unoptimized nano-bio interface with living cells. Here, we report that nanolaminate plasmonic nanocavities on three-dimensional (3D) vertical nanopillar arrays can support a broadband SERS operation with large enhancement factors (> 106) under laser excitations at 532 nm, 633 nm, and 785 nm. The multi-band Raman mapping measurements show that nanolaminate plasmonic nanocavities on vertical nanopillar arrays exhibit broadband uniform SERS performance with diffraction-limited resolution at a single nanopillar footprint. By selective exposure of embedded plasmonic hotspots in individual metal-insulator-metal (MIM) nanogaps, we demonstrate nanoscale broadband SERS operation at the single MIM nanocavity level with visible and near-infrared (vis-NIR) excitations. Numerical studies reveal that nanolaminate plasmonic nanocavities on vertical nanopillars can support multiple hybridized plasmonic modes to concentrate optical fields across a broadband wavelength range from 500 nm to 900 nm at the nanoscale.
Citation
Advanced Functional Materials
Volume
32
Issue
32

Citation

Nie, M. , Zhao, Y. , Nam, W. , Song, J. , Zhu, W. , Lezec, H. , Agrawal, A. and Zhou, W. (2022), Broadband Nanoscale Surface-Enhanced Raman Spectroscopy by Multiresonant Nanolaminate Plasmonic Nanocavities on Vertical Nanopillars, Advanced Functional Materials, [online], https://doi.org/10.1002/adfm.202202231, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=934309 (Accessed October 3, 2022)
Created August 8, 2022, Updated August 16, 2022