The present disclosure relates to a microbolometer comprising an array of pixels, each pixel comprising one or more detection cells, each detection cell comprising an absorption layer (530) forming a quarter-wave cavity (533) having a height (h) of between 1.5 and 5 μm, wherein the pitch of the detection cells in at least one axis in a plane of the pixel array is in the range 2.4 h to 3.6 h.