A chip-based spectrometer that is smaller than a dime has demonstrated the ability to detect methane in concentrations as low as 100 parts-per-million. The spectrometer leverages silicon photonics technology to realize a compact, cost-effective design that provides IR tunable diode-laser absorption spectroscopy (IR-TDLAS) on a CMOS-compatible platform. 

Developed by scientists at IBM Thomas J. Watson Research Center, the chip-based spectrometer uses an approach similar to absorption spectroscopy; but instead of a free-space setup, the laser travels through a narrow silicon waveguide that follows a 10-centimeter-long serpentine pattern on top of a chip measuring 16 square millimeters. 

 

Read more at https://www.photonics.com/Article.aspx?AID=62712&PID=6&VID=146&IID=980

Author: AOLab
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