摘要
A design for focusing an incoming light into an ultrasmall spot with a long depth of focus is proposed. We use a phase plate with three concentric regions to modulate the incoming light from radial polarization into outward-inward-outward polarization. The analysis shows that the design is more suitable for a lens with a high numerical aperture because much energy is concentrated in the main lobe of the focus spot.
| 原文 | ???core.languages.en_GB??? |
|---|---|
| 頁（從 - 到） | 99-101 |
| 頁數 | 3 |
| 期刊 | Optics Letters |
| 卷 | 28 |
| 發行號 | 2 |
| DOIs | |
| 出版狀態 | 已出版 - 15 1月 2003 |