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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 35, Number 3
BKCSDE 35(3)
March 20, 2014 

 
Title
Fabrication of Microgratings and their IR Diffraction Spectra
Author
In Cheol Kim, Eunwoo Choi, Seong Kyu Kim*, Young Il Kang, Taeseong Kim, Hyo-Wook Bae, Do-Hyun Park
Keywords
Micrograting, Gradient search, MEMS, IR spectrum, Fraunhofer diffraction
Abstract
Microgratings whose diffracted field at a fixed angle generate IR spectra of SF6 or NH3 were fabricated by MEMS techniques for the purpose of IR correlation spectroscopy. Each micrograting was composed of 1441 reflecting lines in the area of 19.2 × 19.2 mm2. The depth profile of the line elements was determined with a gradient searching method that was described in our previous publication (J. Mod. Opt. 2013, 60, 324-330), and was discretized into 16 levels between 0 and 6.90 μm. The diffraction field from a given depth profile was calculated with Fraunhofer equation. The fabricated microgratings showed errors in the depth and the width within acceptable ranges. As the result, the diffracted IR spectrum of each micrograting matched well with its target reference spectrum within spectral resolution of our optical setup.
Page
908 - 912
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