4.8 Article

Manipulating Coupled Field Enhancement in Slot-under-Groove Nanoarrays for Universal Surface-Enhanced Raman Scattering

Journal

ACS NANO
Volume 17, Issue 22, Pages 22766-22777

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsnano.3c07458

Keywords

gap-surface plasmons; localized surface plasmon resonance; surface-enhanced Raman scattering; anodic aluminum oxide; sensors

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This article presents a universal SERS platform for reliable and sensitive identification of a wide range of analytes. The key to its success lies in the prepared slot-under-groove nanoarchitecture arrays, which enable strong coupled field enhancement and large spatial mode distribution, thereby delivering high sensitivity for small-sized analytes and large Raman gain for large-sized analytes.
Surface-enhanced Raman scattering (SERS) is an ultrasensitive spectroscopic technique that can identify materials and chemicals based on their inelastic light-scattering properties. In general, SERS relies on sub-10 nm nanogaps to amplify the Raman signals and achieve ultralow-concentration identification of analytes. However, large-sized analytes, such as proteins and viruses, usually cannot enter these tiny nanogaps, limiting the practical applications of SERS. Herein, we demonstrate a universal SERS platform for the reliable and sensitive identification of a wide range of analytes. The key to this success is the prepared slot-under-groove nanoarchitecture arrays, which could realize a strongly coupled field enhancement with a large spatial mode distribution via the hybridization of gap-surface plasmons in the upper V-groove and localized surface plasmon resonance in the lower slot. Therefore, our slot-under-groove platform can simultaneously deliver high sensitivity for small-sized analytes and the identification of large-sized analytes with a large Raman gain.

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