An array bolometric detector for the detection of an electromagnetic radiation in a predetermined range of infrared or terahertz wavelengths, comprising: ▪ a substrate; and ▪ an array of bolometric microplates for the detection of said radiation, suspended above the substrate by means of support elements, characterized in that: ▪ it comprises: ∘ a support layer at least partially transparent to the radiation to be detected and having its thickness substantially complying with relation h 2 = m × λ 2 × n 2, where h 2 is said thickness, n 2 is the refractive index of the support layer, and m is a positive integer greater than or equal to 1, said support layer having lateral support walls; ∘ a membrane substantially transparent to the radiation to be detected and resting on the support layer such that said support layer forms with its lateral support walls and the membrane a tight enclosure having an assembly of at least one microplate comprising said microplate arranged therein, said membrane having a first refractive index, arranged above each microplate, and wherein patterns are formed, which have a second refractive index smaller than the first refractive index, across at least a portion of the thickness of the membrane; ▪ and in that: ∘ the patterns of the membrane are placed periodically therein, along at least one predetermined axis, according to a period shorter than or equal to λ n, where λ is a wavelength from the wavelength range to be detected n and n is the average refractive index of the medium separating the microplate from the membrane; ∘ the width of the patterns along the or each predetermined axis increases from a location of the membrane, positioned above a central area of the microplate, towards the periphery of the membrane. ▪ a substrate; and ▪ an array of bolometric microplates for the detection of said radiation, suspended above the substrate by means of support elements, characterized in that: ▪ it comprises: ∘ a support layer at least partially transparent to the radiation to be detected and having its thickness substantially complying with relation h 2 = m × λ 2 × n 2, where h 2 is said thickness, n 2 is the refractive index of the support layer, and m is a positive integer greater than or equal to 1, said support layer having lateral support walls; ∘ a membrane substantially transparent to the radiation to be detected and resting on the support layer such that said support layer forms with its lateral support walls and the membrane a tight enclosure having an assembly of at least one microplate comprising said microplate arranged therein, said membrane having a first refractive index, arranged above each microplate, and wherein patterns are formed, which have a second refractive index smaller than the first refractive index, across at least a portion of the thickness of the membrane; ∘ a support layer at least partially transparent to the radiation to be detected and having its thickness substantially complying with relation h 2 = m × λ 2 × n 2, where h 2 is said thickness, n 2 is the refractive index of the support layer, and m is a positive integer greater than or equal to 1, said support layer having lateral support walls; ∘ a membrane substantially transparent to the radiation to be detected and resting on the support layer such that said support layer forms with its lateral support walls and the membrane a tight enclosure having an assembly of at least one microplate comprising said microplate arranged therein, said membrane having a first refractive index, arranged above each microplate, and wherein patterns are formed, which have a second refractive index smaller than the first refractive index, across at least a portion of the thickness of the membrane; ▪ and in that: ∘ the patterns of the membrane are placed periodically therein, along at least one predetermined axis, according to a period shorter than or equal to λ n, where λ is a wavelength from the wavelength range to be detected n and n is the average refractive index of the medium separating the microplate from the membrane; ∘ the width of the patterns along the or each predetermined axis increases from a location of the membrane, positioned above a central area of the microplate, towards the periphery of the membrane. ∘ the patterns of the membrane are placed periodically therein, along at least one predetermined axis, according to a period shorter than or equal to λ n, where λ is a wavelength from the wavelength range to be detected n and n is the average refractive index of the medium separating the microplate from the membrane; ∘ the width of the patterns along the or each predetermined axis increases from a location of the membrane, positioned above a central area of the microplate, towards the periphery of the membrane.