Ultrasmall focusing spot with a long depth of focus based on polarization and phase modulation
| Autor: | Ching Cherng Sun, Chin Ku Liu |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Physics
business.industry Main lobe Concentric Polarization (waves) Atomic and Molecular Physics and Optics law.invention Numerical aperture Lens (optics) Phase plate Optics law Astrophysics::Solar and Stellar Astrophysics Radial polarization Astrophysics::Earth and Planetary Astrophysics business Phase modulation |
| Zdroj: | Optics Letters. 28:99 |
| ISSN: | 1539-4794 0146-9592 |
| DOI: | 10.1364/ol.28.000099 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|