3D printed low-permittivity all-dielectric metamaterial for dual-band microwave absorption based on surface lattice resonances

Surface lattice resonances (SLRs) have been widely studied in optical field in recent years but none in microwave field. Meanwhile, some multi-band low-permittivity all-dielectric metamaterial absorbers (ADMMAs) fabricated by machining have been reported recently in microwave band and exhibited similar characteristics with SLRs. Considering this, microwave SLRs are investigated here and a dual-band low-permittivity ADMMA with a period of 20 mm is designed accordingly and fabricated by 3D printing. The simulation result shows an anomaly at 15 GHz and two absorption peaks at 11.35 GHz and 14.45 GHz, respectively. It can be discerned from simulation that the peak at lower frequency results from the magnetic dipole resonances inside individual elements, while the peak at higher frequency results from microwave SLR. The measured result is agreed with the simulated one, indicating that 3D printing is a better alternative for the fabrication of low-permittivity ADMMAs due to its several advantages. In addition, the absorption peaks are quite sensitive to the surrounding environment, which are suitable for microwave sensing applications. It can be expected that this work will help to guide the design of numerous metamaterials whose periods of arrays are close to wavelengths.