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The Mid-Infrared Instrument MIRI on-board the James Webb Space Telescope usesthree Si:As impurity band conduction detector arrays. MIRI medium resolutionspectroscopic measurements (R$\sim$3500-1500) in the 5~$\mu m$ to 28~$\mu m$wavelength range show a 10-30\% modulation of the spectral baseline; coherentreflections of infrared light within the Si:As detector arrays result infringing. We quantify the shape and impact of fringes on spectra of opticalsources observed with MIRI during ground testing and develop an optical modelto simulate the observed modulation. We use our optical model in conjunctionwith the MIRI spectroscopic data to show that the properties of the buriedcontact inside the MIRI Si:As detector have a significant effect on thefringing behavior.

Characterization of the optical properties of the buried contact of the JWST MIRI Si:As infrared blocked impurity band detectors