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In THz reflection spectroscopy the complex permittivity of an opaque mediumis determined on the basis of the amplitude and of the phase of the reflectedwave. There is usually a problem of phase error due to misplacement of thereference sample. Such experimental error brings inconsistency between phaseand amplitude invoked by the causality principle. We propose a rigorous methodto solve this relevant experimental problem by using an optimization methodbased upon singly subtractive Kramers-Kronig relations. The applicability ofthe method is demonstrated for measured data on an n-type undoped (100) InAswafer in the spectral range from 0.5 up to 2.5 THz.Comment: 16 pages, 5 figure

Detection and correction of the misplacement error in terahertz spectroscopy by application of singly subtractive Kramers-Kronig relations