Enhanced resolution induced by random silver nanoparticles in near-field optical disks

Tai Chi Chu, Wei Chih Liu*, Din Ping Tsai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)


The super-resolution near-field structure (super-RENS) is a high-density near-field optical data storage medium which can achieve superior spatial resolution beyond the diffraction limit. Our previous studies found that enhanced local optical intensity occurred at the near fields of super-RENS disks, and the nonlinear near-field optical enhancement is related to the localized surface plasmons of silver clusters dissociated from the AgO x layer in the super-RENS disks. In this paper, we studied the near-field and far-field properties of AgOx-type super-RENS with different distributions of silver nanoparticles using finite-difference time-domain (FDTD) simulations. Highly localized enhancements are found between adjacent silver nanoparticles in the near fields. The far-field signals of different silver nanoparticles distributions confirm the super-resolution capability of AgOx-type Super-RENS disks, and a simplified Fourier optics model is used to describe the relation between highly localized near-field distributions and enhanced resolution of far-field signals.

Original languageEnglish
Pages (from-to)561-567
Number of pages7
JournalOptics Communications
Issue number4-6
Publication statusPublished - 2005 Feb 15


  • Finite-difference time-domain method
  • High-density optical disks
  • Localized surface plasmon
  • Near-field optical storage
  • Optical disks
  • Super-resolution near-field structure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering


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