Spatially tunable and self‐healing plasmonic Talbot imaging by using periodic metal nanopore arrays

Abstract

Plasmonic Talbot imaging exhibits unique advantages over conventional Talbot imaging owing to the potential possibility of the miniaturization and integration of optoelectronic devices. However, the fixed structure parameters limit imaging manipulation, and the defects of masks also affect imaging integrity. Here, we propose a plasmonic Talbot imaging scheme based on the periodic metal nanopore arrays to achieve spatially tunable and self-healing performance evaluated by the FDTD method. The results reveal that the transverse field distribution at the Talbot planes can be offset in the 500 nm range with the incident light angle changed from 0°to 25°, exhibiting a tunability of the spatial position. Meanwhile, the randomly missing and misaligned defects of such periodic metal nanopore arrays can be effectively restored by the presence of low density or defects located at the center. The feasibility of spatial tunability and self-healing may provide an opportunity for optical imaging, nanolithography, and phase manipulation.

Synthesis, characterization, and performance evaluation of polyamide‐Ag@SiO2 Raman substrate

“…In addition, it is capable of solving the broadband problem at a time and obtaining the electromagnetic field distribution directly. It has been demonstrated that FDTD can be applied successfully to the study of SERS properties of typical systems, such as core‐shell structures and periodic metal arrays 25,26 . By using FDTD method, we were able to gain a better understanding of the electromagnetic enhancement mechanism of SERS in order to prepare more excellent SERS substrate by theoretically analyzing the electric field distribution and the “hotspot” position on the PA‐Ag@SiO 2 thin film substrate.…”