基于红外磁偶极子贡献的金属纳米颗粒近场感应加热
Near-field induction heating of metallic nanoparticles due to infrared magnetic dipole contribution
摘要：
我们重新审视了金属纳米粒子和金属半无限衬底之间的电磁热传递，通常使用电偶极子近似进行研究。对于红外和微波频率，我们发现粒子的磁极化率大于电极化率。我们还发现，局域态密度的近场是由磁性的贡献。因此，在近场中被颗粒吸收的功率是由于波动的涡电流的耗散。这些结果表明，近场效应涉及金属颗粒的数量应该受到波动的磁场。
英文摘要：
We revisit the electromagnetic heat transfer between a metallic nanoparticle and a metallic semi-infinite substrate, commonly studied using the electric dipole approximation. For infrared and microwave frequencies, we find that the magnetic polarizability of the particle is larger than the electric one. We also find that the local density of states in the near field is dominated by the magnetic contribution. As a consequence, the power absorbed by the particle in the near field is due to dissipation by fluctuating eddy currents. These results show that a number of near-field effects involving metallic particles should be affected by the fluctuating magnetic fields.
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