Metallo-dielectric photonic crystals for surface-enhanced raman scattering

Yu Zhao, Xue Jin Zhang, Jing Ye, Li Miao Chen, Shu Ping Lau, Wen Jun Zhang, Shuit Tong Lee

Research output: Journal article publicationJournal articleAcademic researchpeer-review

46 Citations (Scopus)

Abstract

Metallo-dielectric photonic crystals (MDPCs) are used as ultrasensitive molecular detectors for concentrations down to picomolar level based on surface-enhanced Raman spectroscopy (SERS). Calculations show that the amorphous silicon photonic crystals (a-Si PCs) embedded in multiple metallo-dielectric (MD) units can significantly increase the electromagnetic fields at the air-dielectric interface, leading to remarkable Raman enhancement. Corresponding experiments show the multiple MDPC structures can serve as an ultrasensitive SERS substrate with excellent reproducibility and stability, capable of quantitative analysis down to 10 pM level. The MDPC structure can be generalized to other applications, such as plasmonic devices, ultrasensitive sensors, and nanophotonic systems.
Original languageEnglish
Pages (from-to)3027-3033
Number of pages7
JournalACS Nano
Volume5
Issue number4
DOIs
Publication statusPublished - 26 Apr 2011

Keywords

  • electromagnetic field
  • metallo-dielectric
  • SERS
  • silicon
  • template synthesis

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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