A functional probe with bowtie aperture and bull's eye structure for nanolithograph |
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Authors: | Wang Shuo Li Xu-Feng Wang Qiao Guo Ying-Yan Pan Shi |
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Institution: | a School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China;b School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China |
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Abstract: | The bowtie aperture surrounded by concentric gratings (the bull's eye structure) integrated on the near-field scanning optical microscopy (NSOM) probe (aluminum coated fiber tip) for nanolithography has been investigated using the finite-difference time domain (FDTD) method. By modifying the parameters of the bowtie aperture and the concentric gratings, a maximal field enhancement factor of 391.69 has been achieved, which is 18 times larger than that obtained from the single bowtie aperture. Additionally, the light spot depends on the gap size of the bowtie aperture and can be confined to sub-wavelength. The superiority of the combination of the bowtie aperture and the bull's eye structure is confirmed, and the mechanism for the electric field enhancement in this derived structure is analyzed. |
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Keywords: | surface plasmon polariton nanolithography finite difference time domain method |
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