KEYWORDS: Near field, Optical discs, Antimony, Surface plasmons, Finite-difference time-domain method, Near field optics, Near field scanning optical microscopy, Wave propagation, Nanostructures, Diffraction
The near-field and far-field optical properties of Sb-type near-field optical disk structures with different polarized
situations are studied by finite-difference time-domain (FDTD) method. Localized surface plasmon enhancements are
found around rough surface of Sb layers for TM polarized, but no near-field enhancement is found in cases with TE
polarized incident waves. Far-field readout contrast signals of both TE and TM polarized situations show the superresolution
capability, because evanescent signals of subwavelength recording marks are coupled to propagating waves by
nanostructures (nano aperture or rough surface) in near-field active layer. Nevertheless, the contrast signals for TM
illumination are higher than TE illumination due to localized surface plasmon enhancements. A simplified Fourier
optics model is used to describe the relation between highly localized near-field distributions and enhanced resolution of
far-field signals.
KEYWORDS: Silver, Nanoparticles, Near field, Near field optics, Super resolution, Finite-difference time-domain method, Near field scanning optical microscopy, Nonlinear optics, Surface plasmons, Diffraction
The super-resolution near-field structure (super-RENS) is an ultrahigh-density near-field optical disk data storage medium which can achieve superior spatial resolution. Our previous studies found that enhanced local optical intensity occurred at the near field of the super-RENS disk, and the nonlinear near-field optical enhancement is related to the localized surface plasmons of silver clusters dissociated from the AgOx layer of the super-RENS disk. In this paper, we report the near-field and far-field properties of AgOx-type super-RENS with different embedded silver nanoparticles using two-dimensional finite-difference time-domain (FDTD) calculations. Highly localized enhancements are found between adjacent silver nanoparticles in the near fields. The far-field signals of different types silver nano scatters confirm the super-resolution capability of AgOx-type Super-RENS disks. The behaviors of far-field signals indicate the correlation between the enhanced localized surface plasmons and the super-resolution capabilities of AgOx-type super-RENS.
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