Abstract
A novel hybrid polymer-metamaterial absorber approach is proposed for enhanced and selective optical sensing of CO2 gas in the 5-8 μm mid IR spectral window. By leveraging the mid IR dynamics of the chemical reactions of Polyethylenimine (PEI) CO2 recognition layer, we demonstrate a new class of sensor with ppm level limit of detection, fast response time (~2 minutes) and small foot print (30μm by 30μm) at ambient temperature (25°C). The metamaterial route further offers large differential change of optical signal at the sensing wavelength. As a proof-of-concept, we report net absorption enhancement of 0.0282%/ppm and wavelength shift of 0.5319 nm/ppm by the scheme. The scheme holds promise for ultra-compact integration with CMOS compatible read out electronics and all-optical reset with low hysteresis and high reliability.
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