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| Waveguide absorption | a0 | a1 | a2 |
|---|---|---|---|
| Surface (single-photon) | SSA | SCA | — |
| Bulk (two-photon) | — | TPA | FCA |
Absorption mechanisms occurring in a Si waveguide and their dependence on light intensity according to equation (1). Single-photon and two-photon refer to the nature of the absorption mechanisms, respectively SSA (surface) and TPA (bulk), responsible for free carrier generation.
