. . "cut-off wavelength"@en . . . . . "Either: wavelengths at which the detectivity (D) falls to 0, or the wavelengths at which the detectivity falls to 1% of the peak value, or the wavelengths at which the normalised detectivity (D*) has fallen to half its peak value."@en . . . . . . . . . . . . . . "\u03BB_c" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .