A Design Method for a Micron-Focusing Plasmonic Lens Based on Phase Modulation |
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Authors: | Fenghuan Hao Rui Wang Jia Wang |
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Institution: | (1) Department of Physics, Tsinghua University, Room 1201, Building 9003, Beijing, 100084, People’s Republic of China;(2) State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing, 100084, People’s Republic of China |
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Abstract: | A design method of a micron-focusing plasmonic lens is proposed, which consists of a nanoaperture surrounded by concentric
annular grooves with fixed width and depth. The phase modulation of the radiation lights decoupled from surface plasmon polariton
waves by the annular grooves is realized by altering the radii of the grooves. Based on the principle of the constructive
interference, a design formula of a micron-focusing plasmonic lens is deduced. The transmitted fields through the designed
plasmonic lenses are numerically simulated with finite-difference time-domain method, and the results show that a circular
focusing spot is generated where the focal length can be controlled in several micrometers, which agree with our theoretical
analysis. |
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Keywords: | |
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