Electromagnetic radiation detector structure adapted to detect electromagnetic radiation in at least one first given range of wavelengths centred around a first wavelength λ 0 , the detector structure comprising: - a support having a receiving surface arranged to receive at least part of the electromagnetic radiation and wherein there is arranged a Fabry-Perot cavity extending at least in part along a thickness of said support, said Fabry-Perot cavity leading onto a first opening of said receiving surface and being delimited by at least one conductive medium having negative permittivity of said support , the Fabry-Perot cavity having a mean Fabry-Perot cavity length Wc on at least one first portion of thickness of the support including the receiving surface and in at least one direction substantially parallel to the receiving surface , the Fabry-Perot cavity housing at least one first confinement medium of refractive index n d ; - an absorption region , configured to absorb electromagnetic radiation, the absorption region having a refractive index n a , - the mean Fabry-Perot cavity length Wc being substantially equal to λ 0 /(2.n eff ), with n eff being an effective refractive index of a guided mode in the absorption region at the first wavelength λ 0 ; The detector structure being characterized in that: - the absorption region has a thickness h a of less than λ 0 /(5.n a ); - the absorption region is housed in the Fabry-Perot cavity at a distance h 1 from the first opening of said Fabry-Perot cavity of between λ 0 /(50.n d ) and λ 0 /(4.n d ); - the thickness of the at least one first portion is equal to or greater than h 1 ; - the refractive index n d of the at least one first confinement medium being lower than 80 % of the refractive index n a of the absorption region. - a support having a receiving surface arranged to receive at least part of the electromagnetic radiation and wherein there is arranged a Fabry-Perot cavity extending at least in part along a thickness of said support, said Fabry-Perot cavity leading onto a first opening of said receiving surface and being delimited by at least one conductive medium having negative permittivity of said support , the Fabry-Perot cavity having a mean Fabry-Perot cavity length Wc on at least one first portion of thickness of the support including the receiving surface and in at least one direction substantially parallel to the receiving surface , the Fabry-Perot cavity housing at least one first confinement medium of refractive index n d ; - an absorption region , configured to absorb electromagnetic radiation, the absorption region having a refractive index n a , - the mean Fabry-Perot cavity length Wc being substantially equal to λ 0 /(2.n eff ), with n eff being an effective refractive index of a guided mode in the absorption region at the first wavelength λ 0 ; - the absorption region has a thickness h a of less than λ 0 /(5.n a ); - the absorption region is housed in the Fabry-Perot cavity at a distance h 1 from the first opening of said Fabry-Perot cavity of between λ 0 /(50.n d ) and λ 0 /(4.n d ); - the thickness of the at least one first portion is equal to or greater than h 1 ; - the refractive index n d of the at least one first confinement medium being lower than 80 % of the refractive index n a of the absorption region. <EOS>