基于表面等离子体激元耦合相位板超聚焦透镜结构的优化设计

Optimal Design of Superfocusing Lens Configuration Based on Surface Plasmon Polariton Coupling Plate

基于银板超透镜和多带相位二元光学衍射理论,提出一种超聚焦透镜结构。利用时域有限差分和标量衍射理论数值分析显示,这种超透镜在可见光范围,具有单一焦点,焦斑尺寸约0.36 λ,聚焦位置和焦深可达10 λ以上,在近场光学扫描显微镜和超分辨成像及光刻等系统中有潜在应用前景。

A superfocusing system is presented based on the theory of silver superlens and multi-phase binary optical elements. We get a single focal light spot with diameter of 0.36 λ and focal depth reached over 10λwhich calculated by finite-difference time-domain method （FDTD） and scalar diffraction theory. This feature makes it a promising to replace the probe of NSOM and to realize the super-resolution imaging and lithography and other applications.