Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Plasmon-enhanced Infrared Spectroscopy Based on Metasurface Absorber with Vertical Nanogap

  • Hwang, Inyong (School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology) ;
  • Lee, Jongwon (School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology) ;
  • Jung, Joo-Yun (Nano-convergence Mechanical Systems Research Division, Korea Institute Machinery and Materials)
  • Received : 2018.08.06
  • Accepted : 2018.08.25
  • Published : 2018.09.30
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Abstract

In this study, we introduce a sensing platform based on a plasmonic metasurface absorber (MA) with a vertical nanogap for the ultrasensitive detection of monolayer molecules. The vertical nanogap of the MA, where the extremely high near-field is uniformly distributed and exposed to the external environment, is formed by an under-cut structure between a metallic cross nanoantenna and the mirror layer. The accessible sensing area and the enhanced near-field of the MA further enhance the sensitivity of surface-enhanced infrared absorption for the target molecule of 1-octadecanethiol. To provide strong coupling between the molecular vibrations and plasmonic resonance, the design parameters of the MA with a vertical nanogap are numerically designed.

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References

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