DOIAbstract
In recent years, air pollution finally has been recognized as a global, pressing issue. The resulting increase in environmental awareness leads to a tremendous rise in demand for low-cost CO2 sensors, which are key components of air quality monitoring and "smart home" applications. In order to access these high-volume, price-sensitive markets, technologies that offer low cost (<$10), sensitive (<50 ppm) and compact (mm-sized) CO2 detection are required. Among the large number of different gas sensing schemes, optical absorption sensors are known for their high selectivity, fast response time, and long-term stability. Furthermore, for certain gases such as CO2, optical absorption sensing is the only reliable detection method currently avai...
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