Fig. 1: Components and Layout of the Metasurface Gas Sensing System.

a Schematic of metasurface gas sensing system. The MIMM and infrared emitter are placed on two sides of a custom-made gas cell. The MIMM is mounted on a thermoelectric temperature stabilizer. The gas cell is filled with gas to be sensed. b Control loop diagram of the TTS controller. c Schematic of the MIMM. Infrared radiation is spectrally filtered by a metasurface array, with transmitted light being absorbed by the pixels of the microbolometer camera. d Schematic illustration of a metallic metasurface filter array