Gas sensor, method for optically measuring the presence of a gas using the gas sensor and gas sensing system

摘要

A gas sensor, comprising a first layer (31) and a second layer (32) superimposed on each other along an interface (35) between the two layers, the first layer (31) comprising an array of nanoparticles (30) along the interface (35), the nanoparticles (30) being provided such as to allow, upon illumination with electromagnetic radiation, long range diffractive coupling of surface plasmon resonances resulting in a surface lattice resonance condition, the second layer (32) comprising a material which, when being exposed to at least one predetermined gas, detectably affects the surface lattice resonance condition, characterized in that the material of the second layer (32) has a porosity of at least 10%.