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Absolute radiation power measurement

FIG. The Invention relates to an absolute power measurement to be made with high internal and/or external quantum efficiency to be utilized in a detector comprising at least one film layer (301) on a substrate (118) so forming a structure to guide radiation (ƴ), within a wave length in a wavelength range and means (202,203) arranged to get at least part of said radiation (ƴ) absorbed in the detector body (118) by a conversion of the energy of said radiation photons (ƴ3) to energy of an electrical current (h+, e”) in an operation temperature (T) of the detector.