论文部分内容阅读
Oil immersion objective holding a high numerical aperture can excite surface plasmon resonance with the same strategy as Kretschmann-Raether configuration.The symmetric structure under the entrance pupil makes the SPP electric field distribution more attractive, especially in high resolution microscopy applications.In this paper, we calculate the electric field distribution on a silver surface, in which the polarization change is paid more attention.We found that the introduction of a thin layer of silver surface extraordinarily enhanced the Ez field.The amplitude is enhanced ~3 times compared to the field without the metal film.