Plasmonic Lens with Multiple-Turn Spiral Nano-Structures |
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Authors: | Junjie Miao Yongsheng Wang Chuanfei Guo Ye Tian Shengming Guo Qian Liu Zhiping Zhou |
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Institution: | (1) National Center for Nanoscience and Technology, No. 11, Beiyitiao, Beijing, 100190, China;(2) State Key Laboratory on Advanced Optical Communication Systems and Networks, Peking University, Beijing, 100871, China;(3) Graduate School of the Chinese Academy of Sciences, Beijing, 100190, China; |
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Abstract: | In this paper, we investigate the focusing properties of a plasmonic lens with multiple-turn spiral nano-structures, and analyze
its field enhancement effect based on the phase matching theory and finite-difference time-domain simulation. The simulation
result demonstrates that a left-hand spiral plasmonic lens can concentrate an incident right-hand circular polarization light
into a focal spot with a high focal depth. The intensity of the focal spot could be controlled by altering the number of turns,
the radius and the width of the spiral slot. And the focal spot is smaller and has a higher intensity compared to the incident
linearly polarized light. This design can also eliminate the requirement of centering the incident beam to the plasmonic lens,
making it possible to be used in plasmonic lens array, optical data storage, detection, and other applications. |
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