Optical emission from impurities within an epitaxial-silicon optical waveguide

Beryllium pairs form an isoelectronic complex in crystalline silicon that can bind an exciton. At sufficiently low temperatures, this bound exciton radiates in a narrow line near the wavelength lambda = 1.15 microm. We report the observation of optical confinement of this bound-exciton emission from beryllium impurities introduced, by ion implantation, into an epitaxial-silicon optical waveguide.