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(a) Schematic structure of the hybrid coupler with Au strip (yellow) and SiN strip (gray) surrounded by . Inset is the cross section of the structure in the plane. (b) Photo of the hybrid coupler under microscope. Inset is the photo of the Au film by transmission electron microscope.
TE mode output power profile along axis measured from four samples when input was fixed at and applied on the SiN waveguide. The inset is the simulated 2D TE output energy profile in the plane. The solid line illustrates the simulated optical power received by the tapered fiber with mode size along the white dashed line marked in the inset.
(a) TM output power from Au strip (square) and SiN strip (dot) normalized by the total output with various interaction lengths when input was fixed at and applied on the SiN waveguide. The measured data are well fitted by the solid curves of . (b) The amplitude of magnetic field of the two simulated TM eigenmodes.
TM mode output power profile of four samples along axis with reaction length (a) , (b) , where the input was applied on the SiN waveguide with . The inset is the corresponding simulated 2D TM output power profile in the plane. The simulated optical power received by the tapered fiber with mode size along the white dashed line in the inset is well fit to the measured data.
Proportion of the TM power coupled to Au strip (square) and that remained in SiN waveguide (dot) as a function of wavelength when . The solid line is the simulation results.
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