Super-Resolution Long-Depth Focusing by Radially Polarized Light Irradiation Through Plasmonic Lens in Optical Meso-field

作者：Peng Ruobing; Li Xiong; Zhao Zeyu; Wang Changtao; Hong Minghui; Luo Xiangang^*

来源：Plasmonics, 2014, 9(1): 55-60.

DOI：10.1007/s11468-013-9597-8

• Meso-field
• Plasmonic lens
• Radially polarized light
• Long DOF
• Super-resolution

In this paper, we propose a novel plasmonic lens design consisting of an annular slit and concentric grooves. The simulation results show that under radially polarized illumination, a super-resolution long depth of focus (DOF) spot can be achieved in optical meso-field due to the constructive interference of scattered light by the concentric grooves. We also analyze the influence of depth-tuned annular grooves on focusing performance, including focal length, DOF, and full-width half-maximum. Moreover, focusing efficiency can be enhanced (similar to 350 %) by introducing a circular metallic grating which surrounds the annular slit. This plasmonic lens has potential applications in nano-imaging and nano-photolithography.

• 出版日期2014-2
• 单位中国科学院大学; 中国科学院光电技术研究所