Spectroscopic Ellipsometry Measurements for Liquid and Solid InSb around Its Melting Point

We have carried out spectroscopic ellipsometry measurements for liquid- and solid-phase InSb around its melting point for wavelengths of 300 to 1700 nm. The real and imaginary parts of the complex refractive index for liquid and solid InSb appear to be completely different, with the imaginary part f...

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Published inApplied physics express Vol. 6; no. 8; pp. 082501 - 082501-4
Main Authors Kuwahara, Masashi, Endo, Rie, Tsutsumi, Kouichi, Morikasa, Fukuyoshi, Suzuki, Michio, Shima, Takayuki, Susa, Masahiro, Endo, Tomoyoshi, Tadokoro, Toshiyasu, Hosaka, Sumio
Format Journal Article
LanguageEnglish
Published The Japan Society of Applied Physics 01.08.2013
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Summary:We have carried out spectroscopic ellipsometry measurements for liquid- and solid-phase InSb around its melting point for wavelengths of 300 to 1700 nm. The real and imaginary parts of the complex refractive index for liquid and solid InSb appear to be completely different, with the imaginary part for the liquid being higher than that of the solid. This result agrees with the proposed mechanism for the super-resolution readout effect in optical disks using an InSb film. From a dielectric function analysis, we find that InSb characteristics clearly change from semiconducting in the solid to metallic in the liquid.
Bibliography:Schematic cross-sectional view of the improved system. Direct incident light and detection configuration was adopted, that was different from the previous system. Phase dependence of $\Psi$ at four wavelengths. InSb is in the solid-phase kept at 450 °C and in the liquid-phase kept at 600 °C. The reversibility of the $\Psi$ between the solid- and liquid-phase are clearly seen. Experiment results of $\Psi$ and $\Delta$ in the solid-phase ($\Psi$: blue solid line, $\Delta$: light blue dashed line) and the liquid-phase ($\Psi$: red solid line, $\Delta$: orange dashed line). The black dashed lines are fitting curves. Complex refractive indices $n$ and $k$ for InSb from 300 to 1700 nm for the solid (blue solid and dashed lines) at 450 °C and the liquid (red solid and dashed lines) at 600 °C. Plot of dielectric functions against the photon energy. Blue and red lines indicate the cases of the solid- and liquid-phases, respectively. From the linear extrapolation of $\varepsilon_{1}$ of the liquid-phase, which is shown by a black dashed line, the photon energy for $\varepsilon_{1}=0$ is approximately 7.5 eV, which corresponds to a calculated plasma frequency energy of $\hbar\omega_{\text{p}}=7.6$ eV.
ISSN:1882-0778
1882-0786
DOI:10.7567/APEX.6.082501