On-chip near-infrared spectroscopy of CO₂ using high resolution plasmonic filter array Public Deposited


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Copyright 2016 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Applied Physics Letters and may be found at:  http://scitation.aip.org/content/aip/journal/apl/108/22/10.1063/1.4953261


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  • On-chip near-infrared spectroscopy of CO2 using high resolution plasmonic filter array
Abstract or Summary
  • We report an ultra-compact, cost-effective on-chip near-infrared spectroscopy system for CO₂ sensing using narrow-band optical filter array based on plasmonic gratings with a waveguide layer. By varying the periodicity of the gratings, the transmission spectra of the filters can be continuously tuned to cover the 2.0 μm sensing window with high spectral resolution around 10 nm. Our experimental results show that the on-chip spectroscopy system can resolve the two symmetric vibrational bands of CO₂ at 2.0 μm wavelength, which proves its potential to replace the expensive commercial IR spectroscopy system for on-site gas sensing.
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  • Chong, X., Li, E., Squire, K., & Wang, A. X. (2016). On-chip near-infrared spectroscopy of CO₂ using high resolution plasmonic filter array. Applied Physics Letters, 108(22), 221106. doi:10.1063/1.4953261
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