Application of spectral surface plasmon resonance for gas pressure sensing

H. P. Ho, C. L. Wong

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

A pressure sensor based on the spectral response associated with the surface plasmon resonance (SPR) occurring on a 50 nm gold surface is described. The operation of the device relies on the fact the refractive index of a gas changes with pressure. Since the conditions for SPR is extremely sensitive to refractive index variations, the pressure of the gas exposed to the sensor surface can be detected. In our spectral SPR sensor, such refractive index change leads to a shift in the spectral dip in the SPR curve. Experiments performed on nitrogen gas at room temperature has demonstrated that our trial setup has a sensitivity threshold of 8.33×10-4 RI units, which corresponds to a pressure change of 6.3 psi. We expect that further improvement may be possible if we use better spectral signal processing algorithm to locate the spectral dip with higher degree of accuracy.

Original languageEnglish
Title of host publicationProceedings - 2002 IEEE Hong Kong Electron Devices Meeting, HKEDM 2002
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages73-77
Number of pages5
ISBN (Electronic)0780374290
DOIs
StatePublished - 2002
Externally publishedYes
Event9th IEEE Hong Kong Electron Devices Meeting, HKEDM 2002 - Hong Kong, China
Duration: 22 06 2002 → …

Publication series

NameProceedings of the IEEE Hong Kong Electron Devices Meeting
Volume2002-January

Conference

Conference9th IEEE Hong Kong Electron Devices Meeting, HKEDM 2002
Country/TerritoryChina
CityHong Kong
Period22/06/02 → …

Bibliographical note

Publisher Copyright:
© 2002 IEEE.

Keywords

  • Biosensors
  • Force measurement
  • Optical refraction
  • Optical sensors
  • Optical surface waves
  • Plasmons
  • Pressure measurement
  • Refractive index
  • Resonance
  • Sensor phenomena and characterization

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