https://www.selleckchem.com/pr....oducts/ly2835219.htm
Breath sensing is an effective tool for health monitoring. Previously, high-mesa waveguide structures have been proposed by our group for realizing a compact breath-sensing photonic circuit. By using the doped SiO2 as the waveguide core, 50% concentration CO2 has been detected. One issue of preventing parts per million (ppm)-order detection is the low portion of evanescent light (Γair=2.2%) in the doped SiO2 waveguides. In order to realize low propagation loss α and high Γair simultaneously, thin silicon (Si) waveguides with a Γair as
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