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On-chip non-dispersive infrared CO2 sensor based on an integrating cylinder
Abstract
In this paper, we propose a novel, miniaturized non-dispersive infrared (NDIR) CO2 sensor implemented on a silicon chip. The sensor has a simple structure, consisting of a hollow metallic cylindrical cavity along with access waveguides. A detailed analysis of the proposed sensor is presented. Simulation with 3D ray tracing shows that an integrating cylinder with 4 mm diameter gives an equivalent optical path length of 3 . 5 cm. The sensor is fabricated using Deep Reactive Ion Etching (DRIE) and wafer bonding. The fabricated sensor was evaluated by performing a CO2 concentration measurement, showing a limit of detection of ∼100 ppm. The response time of the sensor is only ∼2.8 s, due to its small footprint. The use of DRIE-based waveguide structures enables mass fabrication, as well as the potential co-integration of flip-chip integrated midIR light-emitting diodes (LEDs) and photodetectors, resulting in a compact, low-power, and low-cost NDIR CO2 sensor- journalArticle
- info:eu-repo/semantics/article
- info:eu-repo/semantics/publishedVersion
- Technology and Engineering
- Electrical and Electronic Engineering
- Analytical Chemistry
- Atomic and Molecular Physics
- and Optics
- Biochemistry
- optical sensor
- CO2 sensor
- non-dispersive infrared (NDIR)
- silicon photonics
- CARBON-DIOXIDE
- OPTICAL SENSOR
- COMPACT