Abstract
Based on the Fresnel–Kirchhoff diffraction theory, webuild up a Gaussian diffraction model of metal-oxide-type super-resolution nearfield structure (super-RENS), which can describe far field optical properties. Thespectral contrast induced by refractive index and the structural changes inAgOx, PtOx and PdOx thin films, which are the key functional layersin super-RENS, are studied by using this model. Comparison results indicate that thespectral contrast depends intensively on the laser-induced distribution and changeof the refractive index in the metal-oxide films. The readout mechanism of themetal-oxide-type super-RENS optical disc is further clarified. This Gaussiandiffraction model can be used as a simple and effective method for choosing properactive materials in super-RENS.
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