Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 99-101 |
| Number of pages | 3 |
| Journal | Optics Letters |
| Volume | 28 |
| Issue number | 2 |
| DOIs | |
| State | Published - 15 Jan 2003 |