Background-suppressed surface-enhanced molecular detection by metamaterial infrared absorber

Atsushi Ishikawa, Takuo Tanaka

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A background-suppressed surface-enhanced molecular detection technique is experimentally demonstrated by utilizing the resonant coupling of plasmonic modes of a metamaterial absorber and Infrared (IR) vibrational modes of molecules. The fabricated metamaterial consisted of one-dimensional (1D) array of Au micro-ribbons on a thick Au film separated by an MgF2 gap layer. The surface structures were designed to exhibit an anomalous IR absorption at ∼ 3000 cm-1, which spectrally overlapped with C-H stretching vibrational modes. 16-Mercaptohexadecanoic acid (16-MHDA) was used as a test molecule, which formed a 2-nm thick self-assembled monolayer (SAM) with their thiol head-group chemisorbed on the Au surface. In the FTIR measurements, the symmetric and asymmetric C-H stretching modes of the 16-MHDA were clearly observed as Fano-like anti-resonance peaks within a broad plasmonic absorption of the metamaterial. The lowbackground detection scheme with tailored plasmonic enhancement by the metamaterial absorber dramatically improved the sensitivity down to ∼ 1.8 attomoles within the diffraction-limited IR beam spot. Our metamaterial approach thus may open up new avenues for realizing ultrasensitive IR inspection technologies.

Original languageEnglish
Title of host publicationPlasmonics: Metallic Nanostructures and Their Optical Properties XII
PublisherSPIE
Volume9163
ISBN (Print)9781628411904
DOIs
Publication statusPublished - 2014
EventPlasmonics: Metallic Nanostructures and Their Optical Properties XII - San Diego, United States
Duration: Aug 17 2014Aug 21 2014

Other

OtherPlasmonics: Metallic Nanostructures and Their Optical Properties XII
CountryUnited States
CitySan Diego
Period8/17/148/21/14

Fingerprint

Metamaterials
Absorber
absorbers
Infrared
Infrared radiation
Plasmonics
infrared inspection
vibration mode
acids
Stretching
thiols
Absorption
ribbons
infrared absorption
thick films
Molecules
molecules
Self-assembled Monolayer
Acids
Infrared absorption

Keywords

  • Fano resonances
  • Infrared absorption spectroscopy
  • Metamaterial absorber
  • Plasmonic coupling
  • Plasmonic metamaterials
  • Plasmonic sensors
  • Self-assembled monolayers
  • Surface-enhanced infrared absorption

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Ishikawa, A., & Tanaka, T. (2014). Background-suppressed surface-enhanced molecular detection by metamaterial infrared absorber. In Plasmonics: Metallic Nanostructures and Their Optical Properties XII (Vol. 9163). [91632Q] SPIE. https://doi.org/10.1117/12.2061505

Background-suppressed surface-enhanced molecular detection by metamaterial infrared absorber. / Ishikawa, Atsushi; Tanaka, Takuo.

Plasmonics: Metallic Nanostructures and Their Optical Properties XII. Vol. 9163 SPIE, 2014. 91632Q.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Ishikawa, A & Tanaka, T 2014, Background-suppressed surface-enhanced molecular detection by metamaterial infrared absorber. in Plasmonics: Metallic Nanostructures and Their Optical Properties XII. vol. 9163, 91632Q, SPIE, Plasmonics: Metallic Nanostructures and Their Optical Properties XII, San Diego, United States, 8/17/14. https://doi.org/10.1117/12.2061505
Ishikawa A, Tanaka T. Background-suppressed surface-enhanced molecular detection by metamaterial infrared absorber. In Plasmonics: Metallic Nanostructures and Their Optical Properties XII. Vol. 9163. SPIE. 2014. 91632Q https://doi.org/10.1117/12.2061505
Ishikawa, Atsushi ; Tanaka, Takuo. / Background-suppressed surface-enhanced molecular detection by metamaterial infrared absorber. Plasmonics: Metallic Nanostructures and Their Optical Properties XII. Vol. 9163 SPIE, 2014.
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