TY - JOUR
T1 - Mid-infrared photonic gas sensing using a silicon waveguide and an integrated emitter
AU - Consani, C.
AU - Ranacher, C.
AU - Tortschanoff, A.
AU - Grille, T.
AU - Irsigler, P.
AU - Jakoby, B.
PY - 2018/11/20
Y1 - 2018/11/20
N2 - The miniaturization of optical gas sensors is of interest for automotive and consumer electronics. We recently presented the use of silicon waveguides for evanescent-field gas detection in the mid-infrared by using an external laser source. However, the feasibility of the method is not guaranteed when the laser source is replaced by an integrated light source, typically a thermal emitter, due to the lower emitted power of the latter. Here, after experimentally characterizing the evanescent-field ratio of the fabricated structures, we demonstrate the feasibility of gas detection using a silicon waveguide and a low-cost integrated thermal emitter. Specifically, using the first demonstrators we achieve CO2 detection down to a concentration of 10% with a confidence level of three standard deviations. The current detection limit is close to that previously measured with an external laser source and it is mainly limited by the yet not-optimized waveguide structure. This research represents a promising advancement for the development of fully-integrated photonic gas sensors in the mid-infrared.
AB - The miniaturization of optical gas sensors is of interest for automotive and consumer electronics. We recently presented the use of silicon waveguides for evanescent-field gas detection in the mid-infrared by using an external laser source. However, the feasibility of the method is not guaranteed when the laser source is replaced by an integrated light source, typically a thermal emitter, due to the lower emitted power of the latter. Here, after experimentally characterizing the evanescent-field ratio of the fabricated structures, we demonstrate the feasibility of gas detection using a silicon waveguide and a low-cost integrated thermal emitter. Specifically, using the first demonstrators we achieve CO2 detection down to a concentration of 10% with a confidence level of three standard deviations. The current detection limit is close to that previously measured with an external laser source and it is mainly limited by the yet not-optimized waveguide structure. This research represents a promising advancement for the development of fully-integrated photonic gas sensors in the mid-infrared.
KW - Beer-Lambert law
KW - Evanescent-field absorption
KW - Optical gas sensing
KW - Silicon photonics
UR - https://www.mendeley.com/catalogue/19534e8d-f48f-30c1-82cc-10da29ba0564/
U2 - 10.1016/j.snb.2018.07.096
DO - 10.1016/j.snb.2018.07.096
M3 - Article
SN - 0925-4005
VL - 274
SP - 60
EP - 65
JO - Sensors and Actuators, B: Chemical
JF - Sensors and Actuators, B: Chemical
ER -