Ultrasmall focusing spot with a long depth of focus based on polarization and phase modulation

Ching Cherng Sun, Chin Ku Liu

Research output: Contribution to journalArticlepeer-review

109 Scopus citations

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 languageEnglish
Pages (from-to)99-101
Number of pages3
JournalOptics Letters
Volume28
Issue number2
DOIs
StatePublished - 15 Jan 2003

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