All-dielectric optical nanoantennas.
All-dielectric optical nanoantennas.
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DOI：
10.1063/1.4750083
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发表时间：
2012-06
期刊：
影响因子：
3.8
通讯作者：
Alex Krasnok;A. Miroshnichenko;P. A. Belov;Y. Kivshar
中科院分区：
文献类型：
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作者：
Alex Krasnok;A. Miroshnichenko;P. A. Belov;Y. Kivshar
我们详细研究了一种新型的高介电常数低损耗电介质颗粒制成的光学纳米天线。除了电共振之外，介电颗粒在纳米尺度下表现出非常强的磁共振，这可以在八木宇田几何中用于创建高效的光学纳米天线。通过比较等离子体和电介质纳米天线，我们证明了全电介质纳米天线可以表现出更好的辐射效率，也允许更紧凑的设计。
We study in detail a novel type of optical nanoantennas made of high-permittivity low-loss dielectric particles. In addition to the electric resonances, the dielectric particles exhibit very strong magnetic resonances at the nanoscale, that can be employed in the Yagi-Uda geometry for creating highly efficient optical nanoantennas. By comparing plasmonic and dielectric nanoantennas, we demonstrate that all-dielectric nanoantennas may exhibit better radiation efficiency also allowing more compact design.