We predict theoretically that the effective in-plane thermal conductivity of polar, amorphous thin films can be increased by surface phonon-polaritons significantly beyond their intrinsic bulk values. We show that the thermal conductivity due to surface phonon-polaritons increases with decreasing film thickness. In particular, for a 40-nm-thick film of amorphous silicon dioxide, we calculate a total thermal conductivity of 4 W m−1 K−1 at 500 K, which is an increase of ∼100% over the intrinsic phonon thermal conductivity.
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机译：我们从理论上预测，表面声子-极化子可显着超过其固有体积值，从而提高极性，非晶态薄膜的有效面内导热率。我们表明，由于表面声子-极化子导致的热导率随着薄膜厚度的减小而增加。特别是，对于厚度为40 nm的非晶二氧化硅薄膜，我们计算出在500 K时的总热导率为4 W m-1 K-1，比本征声子热导率增加了约100％。
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