Fig. 1. （a）Three-dimensional structural diagram of the all-dielectric antislot waveguide，（b）its cross-section，（c）partial enlarged view of （b）Note：（a），（b），and （c）are all not drawn to scale

Fig. 2. （a）Influence of structural parameters on normalized mode area of the all-dielectric antislot waveguide，（b）normalized electromagnetic energy density and electric vector distributions at W = 150 nm，W₁ = 50 nm，and W₂ = 20 nm. The definition of W，W₁，and W₂ is shown in Fig. 1（b）Note：The height of the waveguide is 220 nm

Fig. 3. （a）The light coupling structure from the lensed fiber to the antislot waveguide or vice versa，（b）partial enlarged view of （a）Note：（a）and （b）are both not drawn to scale. The zero in y and z directions is located at the middle of the coupling structure and the middle of the top silicon，respectively

Fig. 4. Influence of the lensed fiber position on coupling efficiency and loss in （a）z and （b）y directions. The optimal fiber position in z and y directions is approximately located at 1.4 μm and 0，respectively

Fig. 5. Coupling efficiency （a）from the lensed fiber to the silicon waveguide as a function of the inverse taper length （L₁）with the lensed fiber at the optimal position and （b）from the silicon waveguide to the antislot waveguide as a function of the adiabatic linear taper length （L₂）

Fig. 6. Electromagnetic energy transfer process from the silicon waveguide to the antislot waveguide （a），（c）at the xz section with y = 0，（b），（d）at the xy section with z = 0 Note：（a）and （b）correspond to the case when the length of the adiabatic linear taper is 8 μm，（c）and （d）are the case of without the adiabatic linear taper

Fig. 7. Electromagnetic energy transfer process from the antislot waveguide to the output end （a）the length of the antislot waveguide，the adiabatic linear taper，the silicon waveguide and the inverse taper is 4 μm，8 μm，2 μm and 10 μm，respectively，（b）corresponds to the case of without the adiabatic linear taper