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Chemically Synthesized Electromagnetic Metal Oxide Nanoresonators

机译：化学合成的电磁金属氧化物纳米谐振器

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摘要

Metal oxide nanostructures represent a large class of dielectric nanomaterials with high or moderate refractive indexes. Dielectric nanomaterials have recently attracted much attention in the field of all-dielectric nanophotonics. They can support both electric and magnetic resonances without suffering from high losses or heating as their plasmonic counterparts. Although various intriguing optical effects have been discovered on dielectric nanostructures, a real challenge in this field is the difficulty in the production of dielectric nanostructures with well-defined geometry, smooth surface, moderate/high refractive indexes, and good crystallinity. In this work, using an aerosol spray method and subsequent thermal treatment, smooth-surfaced metal oxide spheres that span a broad size range from 100 nm to several micrometers in diameter and a relatively wide refractive index range from 2 to 2.35 in the visible region have been successfully synthesized. In particular, they are shown to support strong electric and magnetic resonances of different orders in excellent agreement with Mie theory, which is a signature of their outstanding optical performance. The findings offer many possibilities for a wide variety of low-loss optical components, from Mie-type nanoresonators and whispering gallery cavities to micrometer lenses.
机译：金属氧化物纳米结构代表具有高或中等折射率的一大类介电纳米材料。介电纳米材料最近在全介电纳米光子学领域引起了很多关注。它们可以支持电共振和磁共振，而不会像等离激元一样遭受高损耗或发热。尽管已经在介电纳米结构上发现了各种有趣的光学效应，但是在该领域中的真正挑战是难以生产具有定义明确的几何形状，光滑的表面，中等/高折射率以及良好的结晶度的介电纳米结构。在这项工作中，使用气溶胶喷涂方法和随后的热处理，在可见光区域内，光滑表面的金属氧化物球体的直径范围从100 nm到几微米，而折射率范围则在2到2.35之间。已成功合成。尤其是，它们显示出与米氏理论极为一致地支持不同阶数的强电和磁共振，这是其出色光学性能的标志。这些发现为从Mie型纳米谐振器和回音壁腔到微米透镜的各种低损耗光学组件提供了许多可能性。

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