Ultrabroadband Metasurface for Efficient Light Trapping and Localization: A Universal Surface-Enhanced Raman Spectroscopy Substrate for "All" Excitation Wavelengths

Nan Zhang, Kai Liu, Zhejun Liu, Haomin Song, Xie Zeng, Dengxin Ji, Alec Cheney, Suhua Jiang, Qiaoqiang Gan

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

Most reported surface-enhanced Raman spectroscopy (SERS) substrates can work for individual excitation wavelengths only. Therefore, different substrates have to be used for different excitation wavelengths, which consumes more biological/chemical materials, substrates, and measurement time. Here, an ultrabroadband super absorbing metasurface that can work as a universal substrate for low cost and high performance SERS sensing is reported. Due to broadband light trapping and localized field enhancement, this structure can work for almost "all" available laser lines from 450 to 1100 nm. This predicted feature is validated by SERS experiment using five different excitation laser lines, obtaining a high enhancement factor of 5.3 × 107 and very good uniformity over large areas.
Original languageEnglish (US)
JournalAdvanced Materials Interfaces
Volume2
Issue number10
DOIs
StatePublished - Jul 1 2015
Externally publishedYes

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering

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