Experimental verification of focus tailoring using circularly polarized vortex beams with annular pupil mask
✍ Scribed by Shuangyang Yang; Peter E. Powers; Qiwen Zhan
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 606 KB
- Volume
- 282
- Category
- Article
- ISSN
- 0030-4018
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✦ Synopsis
The focusing properties of circularly polarized vortex beam are experimentally verified by examining two-photon fluorescent emission patterns inside an 8 lm fluorescent microsphere. Very good agreements between the experimental and theoretical results have been obtained. Annular pupil masks are used to tailor the profile at the focus. When an LG 1 0 circularly polarized beam with the appropriate handedness is used in combination with an annular pupil aperture, a strong longitudinal component is observed, which results in a raised center and a smaller focal spot. This interesting focusing property can be utilized in applications that require a distinct longitudinal component.