Patent ID: 8675280
Filing Date: 2014-03-18
Classification: G02B,H01L

Abstract:
1. An optical filter structure comprising: at least two adjacent elementary optical filter zones having transmission spectrums different from each other, wherein each optical filter zone is made of a stack of n metallic layers and n-1 dielectric layers, n being an odd integer greater than or equal to 3, each metallic layer alternating with a dielectric layer such that a central layer in the slack is a metallic layer, each dielectric layer and each metallic layer respectively extends across all optical filler zones such that a layer of a same rank counted from the central metallic layer of each optical filter zone is part, respectively, of a same dielectric layer and of a same metallic layer, a thickness of said each dielectric layer and each metallic layer of the same rank is constant for each optical filter zone and equal for all the optical filter zones, a thickness of the central metallic layer of each optical filter zone is constant for each optical filter zone and different between two adjacent optical filter zones, and the thickness of the central metallic layer of an optical filler zone sets the transmission spectrum of said optical filter zone.