There are rumours that SiO (Silicon Monoxide) shows strong optical absorption around 1550 nm wavelength. Additional rumours claim that a diffusion zone between Si and SiO2 layers containing SiO is responsible for higher than expected absorption in Si/SiO2 layer stacks. The absorption of both materials themselves (Si and SiO2) should be low (a few ppm/cm or sub ppm/cm, respectively). Does anyone have information about the thickness or ,preferably, absorption of such a putative diffusion zone?
I use SiO in several multilayer designs in this spectral region, and don't typically see much absorption at all. For instance, I have one AR multilayer containing SiO, Si and SiO2 that shows very high transmittance / low reflectance.
The question sounds interesting though - I'd be very interested to learn more about this.
I think the only experimental investigations of absorption spectra mentioned above materials may answer about the presence/absence absorption at 1.55 μm.
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