Characterization of Nonlinear Optical Properties of Silver Oxide Super Resolution Near-Field Structures by Z-Scan Measurements

概要

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Femtosecond laser Z-Scan measurements are used to characterize the nonlinear optical properties of AgOx super resolution near-field structures (super-RENS). Open aperture Z-Scan measurements reveal a complex transient nonlinear optical absorption response of AgOx super-RENS under intensive laser irradiation. This is attributed to the thermal decomposition of AgOx into Ag nanoparticles in the near-field optical mask layer. A bi-compositional model is proposed to explain this complex nonlinear optical response. The threshold laser peak intensity for the phase transition and the nonlinear optical absorption coefficient of an Ag nanoparticle are determined to be $I_{\text{th}}\sim 0.3$ GW/cm2 and $\beta=(-5.6\pm 0.5)\times 10^{3}$ cm/GW at $\lambda=800$ nm, respectively.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2004-08-15