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Design, fabrication...
Design, fabrication and characterization of infrared LVOFs for measuring gas composition
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- Ghaderi, M. (författare)
- Technische Universiteit Delft,Delft University of Technology (TU Delft)
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- Ayerden, N.P. (författare)
- Technische Universiteit Delft,Delft University of Technology (TU Delft)
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- Emadi, A. (författare)
- Technische Universiteit Delft,Delft University of Technology (TU Delft),Maxim Integrated
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- Enoksson, Peter, 1957 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Correia, J. H. (författare)
- Universidade do Minho,University of Minho
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- De Graaf, G. (författare)
- Technische Universiteit Delft,Delft University of Technology (TU Delft)
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- Wolffenbuttel, R. F. (författare)
- Technische Universiteit Delft,Delft University of Technology (TU Delft)
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(creator_code:org_t)
- 2014-07-22
- 2014
- Engelska.
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Ingår i: Journal of Micromechanics and Microengineering. - : IOP Publishing. - 1361-6439 .- 0960-1317. ; 24:8, s. Art. no. 084001-
- Relaterad länk:
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http://dx.doi.org/10...
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- This paper presents the design, fabrication and characterization of a linear-variable optical-filter (LVOF) that will be used in a micro-spectrometer operating in infrared (IR) for natural gas composition measurement. An LVOF is placed on top of an array of detectors and transforms the optical spectrum into a lateral intensity profile, which is recorded by the detectors. The IR LVOF was fabricated in an IC-compatible process using a photoresist reflow technique, followed by transfer etching of the photoresist into the optical resonator layer. The spectral range between 3 to 5 mu m contains the absorption peaks for hydrocarbons, carbon-monoxide and carbon-dioxide. The resulting optical absorption is utilized to measure the gas concentrations in a sample volume. Two LVOF structures were designed and fabricated on silicon wafers using alternate layers of sputtered silicon and silicon-dioxide as the high- and low- refractive index materials. These filters consist of a Fabry-Perot resonator combined with a band-pass filter designed to block out-of-band transmissions. Finally, the filters were fully characterized with an FTIR spectrometer and showed satisfactory agreement with the optical thin-film simulations. The characterization showed a spectral resolution of 100 nm, which can be further improved with signal processing algorithms. This method makes it possible to fabricate small and robust LVOFs with high resolving power in the IR spectral range directly on the detector array chip.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Nanoteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Nano-technology (hsv//eng)
Nyckelord
- optical filter
- IC-compatible
- micro-spectrometer
- infrared spectrum
- hydrocarbon measurement
- LVOF
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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