We provide a fabrication method for silver nano-particles with a uniform particle size using
vacuum deposition. The size uniformity was controlled by a small amount of
neodymium–copper (Nd–Cu) as a co-sputtered material. Particles with a size of
20 ± 7 nm dispersed
in a SiO2
matrix have been obtained. The full width at half maximum of the plasmon resonance in
the optical spectrum by the silver–neodymium–copper (Ag–Nd–Cu) nano-particles was
only half of the size compared with the spectral width of a pure Ag nano-particle
system. The effect is attributed to an increased uniformity in the particle size.
We developed a novel simulation program unified by electromagnetic and thermal distributions for a rotating optical disc on the basis of the three-dimensional finite-difference time-domain (FDTD) method. We applied this simulation to superresolution near-field structure (super-RENS) read-only-memory (ROM) discs and elucidated that the temperature distribution is not only dependent on disc structure and pit shape, but also on incident laser light polarization. We obtained the result that the temperature at the pit became higher than the surrounding temperature for the first time using our simulation program. We believe that our program will aid our understanding of the phenomena behind the super-resolution readout of super-RENS discs.
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