Abstract

We have successfully fabricated low-loss silicon-on-oxidized-porous-silicon (SOPS) strip waveguides with high-index contrast using focused proton-beam irradiation and electrochemical etching. Smooth surface quality with rms roughness of 3.1nm is achieved for a fluence of 1×1015cm2 after postoxidation treatment. Optical characterization at a wavelength of 1550nm shows a loss of 1.1±0.4dBcm and 1.2±0.4dBcm in TE and TM polarization respectively, which we believe is the lowest reported loss for SOPS waveguides. This opens up new opportunities for all-silicon-based optoelectronics applications.

© 2009 Optical Society of America

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