Here, we show that whispering gallery modes of subwavelength dielectric resonators can exhibit ultrahigh electric and magnetic field enhancements due to their high-quality factors. The resonators are dielectric disks. The field enhancements are dependent on the height of the disk, the refractive index n and the azimuthal mode index, and they can reach ∼10² inside a subwavelength disk of n=3.5. For a disk dimer of n=3.5, the electric field enhancement reaches ∼10³ in the small gap. The Purcell factor of an electric and magnetic dipole emitter in the dimer can reach ∼10⁵ and ∼10⁴, respectively.

中文翻译：

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亚波长全介电谐振器中基于高Q回音壁模式的超高电磁近场增强

在这里，我们展示了亚波长介电谐振器的回音壁模式由于其高质量因素可以表现出超高的电场和磁场增强。谐振器是介电盘。场增强取决于圆盘的高度、折射率n和方位角模式指数，在n = 3.5的亚波长圆盘内它们可以达到 ~10 ²。对于n = 3.5的圆盘二聚体，电场增强在小间隙中达到～10 ³。二聚体中电偶极子发射极的珀塞尔因子可以分别达到～^{10 5}和～10 ⁴。