High-reflectivity GeSi/Si asymmetric Bragg reflectorat 0.8 µm

Abstract
A high reflectivity GeSi/Si Bragg mirror centred at 800 nm is reported. The increased absorption in the GeSi layers at this wavelength is found to be more than compensated for by the increased refractive index step available. Agreement with simulations is excellent. This mirror can be used to fabricate a high quantum efficiency, high speed resonant cavity photodiode.