AgO x -type super-resolution near-field structure (Super-RENS) exhibits nonlinear near-field optical behavior in the near field, which is closely related to the subwavelength resolution capability of the Super-RENS disk. Finite-difference time-domain (FDTD) numerical simulations were used to demonstrate that these nonlinear effects may result from collective localized surface plasmons of silver nanoparticles.
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Liu et al. (2003) studied this question.
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