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(a) Cross-sectional view of Ge-on-SOI microscope. (b) The normalized transmission of rib waveguide varies with waveguide length. (c) The relationship between the transmission loss and length of the waveguide [309]. Copyright 2018 IOP Publishing Ltd. (d) Structure diagram of stretchable GeSn waveguide. (e) Band gap change of GeSn in relaxed and stretched states. (f) Absorption spectrum when the content of Sn in GeSn changes [308]. Copyright 2015 The Optical Society.
