Organophosphorous compounds, e.g., sarin, are known for their harmful effects towards human. We propose a rapid chemistry-free III-V semiconductors InAsSb plasmonic transducer working in the mid-infrared with ribbon-shaped nano-antennas associated with a confined enhanced electric field at the nanoscale. Exploiting Salisbury perfect absorber structure coupled to an epsilon-near-zero layer benefit both spectral and spatial overlap for efficient surface-enhanced infrared spectroscopy (SEIRA). A detection signal close to 5% was obtained allowing us to estimate that a 5 Å thick monolayer of the sarin simulant DMMP has bound to the sensor native oxide. FDTD and RCWA simulations confirmed experimental results.
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