Polarization Effect on Superfocusing of a Plasmonic Lens Structured with Radialized and Chirped Elliptical Nanopinholes |
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| Authors: | Zhenkui Shi Yongqi Fu Xiuli Zhou Shaoli Zhu |
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| Institution: | (1) School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, 610054, Sichuan Province, People’s Republic of China;(2) Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu, 610209, People’s Republic of China;(3) School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore; |
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| Abstract: | Tuning effect of different polarization states was presented in this paper. It can be realized by a plasmonic lens constructed
with elliptical pinholes ranging from submicron to nanoscales distributed in variant period along radial direction. Propagation
properties of the lens illuminated under four different polarization states: linear, elliptical, radial, and cylindrical vector
beam, were calculated and analyzed combining with finite-difference time-domain algorithm. Different focusing performances
of the lens were illustrated while the polarized light passes through the pinholes. Our calculation results demonstrate that
polarization effect of the elliptical pinholes-based plasmonic lens can generate high transmission intensity and sharp focusing
for our proposed specific structures. Beam focal region, position, and transmission intensity distribution can be tailored
by the four polarization states. |
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