Journal of the Optical Society of Korea

Optical Society of Korea (한국광학회)
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Simulation for Small Lamellar Grating FTIR Spectrometer for Passive Remote Sensing

  • Chung, You Kyoung (Department of Chemistry and Basic Science Research Institute, Sungkyunkwan University) ;
  • Jo, Choong-Man (Department of Chemistry and Basic Science Research Institute, Sungkyunkwan University) ;
  • Kim, Seong Kyu (Department of Chemistry and Basic Science Research Institute, Sungkyunkwan University) ;
  • Kim, In Cheol (National Institute for Nanomaterials Technology) ;
  • Park, Do-Hyun (MOORI Technologies, Co.) ;
  • Bae, Hyo-Yook (MOORI Technologies, Co.) ;
  • Kang, Young Il (The 5th R&D Institute - 3, Agency for Defense Development)
  • Received : 2016.10.10
  • Accepted : 2016.11.08
  • Published : 2016.12.25
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Abstract

A miniaturized FTIR spectrometer based on lamellar grating interferometry is being developed for passive remote-sensing. Consisting of a pair of micro-mirror arrays, the lamellar grating can be fabricated using MEMS technology. This paper describes a method to compute the optical field in the interferometer to optimize the design parameters of the lamellar grating FTIR spectrometer. The lower limit of the micro-mirror width in the grating is related to the formation of a Talbot image in the near field and is estimated to be about $100{\mu}m$ for the spectrometer to be used for the wavelength range of $7-14{\mu}m$. In calculating the far field at the detection window, the conventional Fraunhofer equation is inadequate for detection distance of our application, misleading the upper limit of the micro-mirror width to avoid interference from higher order diffractions. Instead, the far field is described by the unperturbed plane-wave combined with the boundary diffraction wave. As a result, the interference from the higher order diffractions turns out to be negligible as the micro-mirror width increases. Therefore, the upper limit of the micro-mirror width does not need to be set. Under this scheme, the interferometer patterns and their FT spectra are successfully generated.

Keywords

References

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