An ultranarrow photonic nanojet formed by an engineered two-layer microcylinder of high refractive-index materials
| Autor: | Yuanhua Feng, Zhaohui Li, Yin Huang, Yuecheng Shen, Zhishen Zhen |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
business.industry High-refractive-index polymer Nanoparticle 02 engineering and technology Chemical vapor deposition Photonic nanojet 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics 010309 optics Full width at half maximum Optics Nanolithography 0103 physical sciences 0210 nano-technology business Refractive index Beam (structure) |
| Zdroj: | Optics Express. 27:9178 |
| ISSN: | 1094-4087 |
| DOI: | 10.1364/oe.27.009178 |
| Popis: | A photonic nanojet (PNJ) is a tightly focused beam that emerges from the shadow surface of microparticles. Due to its high peak intensity and subwavelength beam waist, the PNJ has increasingly attracted attention, with potential applications in optical imaging, nanolithography, and nanoparticle sensing. A variety of ways have been demonstrated to further shrink the beam waist of PNJs, such as engineering the microparticle geometry and optimizing a multilayer structure. In this simulation work, we report the realization of an ultranarrow PNJ, which is formed by an engineered two-layer microcylinder of high refractive-index materials. Finite element analysis shows that under 632.8 nm illumination, the full width at half maximum of the beam waist can reach 87 nm (~λ/7.3). As far as we know, this is the narrowest PNJ ever reported. Using the backscattering intensity as a contrast mechanism, we also demonstrated the imaging resolution and capability of the ultranarrow PNJ through numerical simulations. We anticipate that this ultranarrow PNJ will open new possibilities in a variety of research areas, including nanoparticle detection, biomedical imaging, and nanolithography. |
| Databáze: | OpenAIRE |
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