Field enhancement effect of metal probe in evanescent field |
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| Authors: | Xiaogang Hong Wendong Xu Xiaogang Li Chengqiang Zhao Xiaodong Tang |
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| Institution: | 1. Optical Storage Laboratory, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800
2. School of Information Science and Technology, East China Normal University, Shanghai 200241 |
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| Abstract: | Field enhancement effect of metal probe in evanescent field, induced by using a multi-layers structure for exciting surface plasmon resonance (SPR), is analyzed numerically by utilizing two-dimensional (2D) TM wave finite difference time-domain (FDTD) method. In this letter, we used a fundamental mode Gaussian beam to induce evanescent field, and calculated the electric intensity. The results show that compared with the nonmetal probe, the metal probe has a larger field enhancement effect, and its scattering wave induced by field enhancement has a bigger decay coefficient. The field enhancement effect should conclude that the metal probe has an important application in nanolithography. |
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