A Miniaturized Optical Sensor with Integrated Gas Cell
N.P. Ayerden
M. Ghaderi
G. De Graaf
R.F. Wolffenbuttel
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Abstract
The design, fabrication and characterization of a highly integrated optical gas sensor is presented. The gas cell takes up most of the space in a microspectrometer and is the only component that has so far not been miniaturized. Using the tapered resonator cavity of a linear variable optical filter as a gas cell enables ultimate miniaturization, while maintaining robustness without any moving parts. Multiple reflections from highly reflective mirrors allow a 24-25.5 ?m long resonator cavity to also act as a gas cell with an equivalent optical absorption path length of 6 mm.