Utilizing a high quality factor (Q1.5×106) optical microresonator to provide sensitivity down to a fractional surface optical loss of αs107, we show that the optical loss within Si microphotonic components can be dramatically altered by Si surface preparation, with αs1×105 measured for chemical oxide surfaces as compared to αs1×106 for hydrogen-terminated Si surfaces. These results indicate that the optical properties of Si surfaces can be significantly and reversibly altered by standard microelectronic treatments, and that stable, high optical quality surface passivation layers will be critical in future Si micro- and nanophotonic systems.

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