Bifunctional Nano Lycurgus Cup Array Plasmonic Sensor for Colorimetric Sensing and Surface-Enhanced Raman Spectroscopy

Te Wei Chang, Xinhao Wang, Austin Hsiao, Zhida Xu, Guohong Lin, Manas Ranjan Gartia, Xiangrong Liu, Gang Logan Liu

Research output: Contribution to journalArticlepeer-review

Abstract

A bifunctional ultrasensitive nanoplasmonic sensor is demonstrated with combined surface plasmon resonance (SPR) and surface-enhanced Raman spectroscopy (SERS) sensing capabilities. Unlike traditional extraordinary transmission (EOT) devices, nano Lycurgus cup array (nanoLCA) contains a hybrid configuration of periodic quasi-3D nanostructure array and dense sidewall metal nanoparticles within each nanostructure, which enables both refractive index sensing and SERS chemical identification on the same device with high sensitivity. The visible plasmon resonance sensitivity of nanoLCA is measured to be as high as 796 nm/RIU with the figure of merit (FOM) of 12.7 so that the device is applied for colorimetric liquid sensing with an ordinary microscopic system. Moreover, the SERS enhancement of the very same nanoLCA for liquid sample is calculated to be 2.8 × 107, which is the highest among all reported EOT-based SERS devices. The urea concentration detection has been demonstrated to show the complementary rapid colorimetric screening and precise SERS identification functions provided by nanoLCA plasmonic sensor for chemical analysis or biological diagnostics in a resource-limited environment.

Original languageEnglish (US)
Pages (from-to)1397-1404
Number of pages8
JournalAdvanced Optical Materials
Volume3
Issue number10
DOIs
StatePublished - Oct 2015

Keywords

  • Colorimetry
  • Extraordinary transmission
  • Lycurgus cup array
  • Nanoplasmonics
  • SERS
  • Sensors

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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