An investigation of the optical transmission properties of semimetallic ErAs films grown by molecular beam epitaxy reveals a maximum in transmission around 1.55μm. The semitransparent window extends from 1.5to2.3μm. These films were found to have resistivities less than 7×105Ωcm and permit 85% transmission for a 150nm film and 97% transmission for a 15nm film with respect to a GaAs substrate at 1.55μm. These results suggest that ErAs may be a useful material for applications requiring transparent contacts from 1.5to2.3μm. Polycrystalline films of ErAs were grown on sapphire substrates to investigate optical properties of ErAs in the visible region.

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