Fig. 1. (a) Coordination mapping in virtual space (w coordinate). (b) Coordination mapping in physical space (z coordinate). (c) The RI distribution of MFEL in virtual space (w coordinate) and ray trajectories from a point light source. (d), (e) The RI distribution of the square MFEL according to SC mapping in physical space (z coordinate) based on MFEL with n₀ = 1 and n₀ = 2.4, respectively, and the corresponding ray trajectories from a point light source.

Fig. 2. Imaging performance of the square MFEL with different n₀. (a)–(d) The related electric field intensity distribution and the corresponding FWHM of the square MFEL at 15 GHz with n₀ of 1, 1.7, 2.4, and 3.1, respectively. (e)–(h) The relative electric field E_z distributions, respectively.

Fig. 3. Broadband imaging effect of solid immersion square MFEL at different frequencies. (a)–(d) The electric field intensity and the corresponding FWHM of the solid immersion square MFEL at frequencies of 7 GHz, 10 GHz, 13 GHz, and 16 GHz, respectively. (e)–(h) The corresponding real part of electric field distribution, respectively.

Fig. 4. (a)–(f) Electric field intensity distribution and the corresponding FWHM of the solid immersion square MFEL (the first row) and solid immersion quasi-square MFEL (the second row) at frequencies of 8 GHz, 10 GHz, and 12 GHz, respectively.

Fig. 5. (a)–(d) Imaging performance of solid immersion square MFELs with n₀ = 2.4 at the frequencies of 8 GHz, 9 GHz, 11 GHz, and 12 GHz, respectively. (e)–(g) Imaging performance of conventional square MFELs with n₀ = 1 at the frequencies of 8 GHz, 9 GHz, 11 GHz, and 12 GHz, respectively.

Fig. 6. Electric field distribution of super-resolution information channel cascaded by three identical solid immersion MFELs with a 0.6 mm air gap at 12 GHz.