期刊
NANOMATERIALS
卷 9, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/nano9020186
关键词
nanohole; microsphere; subwavelength-scale light focusing
类别
资金
- National Natural Science Foundation of China [51675506]
One of the most captivating properties of dielectric mesoscale particles is their ability to form a sub-diffraction limited-field localization region, near their shadow surfaces. However, the transverse size of the field localization region of a dielectric mesoscale particle is usually larger than lambda/3. In this present paper, for the first time, we present numerical simulations to demonstrate that the size of the electromagnetic field that forms in the localized region of the dielectric mesoscale sphere can be significantly reduced by introducing a nanohole structure at its shadow surface, which improves the spatial resolution up to lambda/40 and beyond the solid immersion diffraction limit of lambda/2n. The proposed nanohole-structured microparticles can be made from common natural optical materials, such as glass, and are important for advancing the particle-lens-based super-resolution technologies, including sub-diffraction imaging, interferometry, surface fabrication, enhanced Raman scattering, nanoparticles synthesis, optical tweezer, etc.
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