High-numerical-aperture focusing of radially polarized doughnut beams with a parabolic mirror and a flat diffractive lens
Recently, Dorn et al. [Phys. Rev. Lett. 91, 233901 (2003)] demonstrated the significance of radially polarized doughnut beams in obtaining very small focal spots (with an area of approximately 0.26 lambda2) with high-numerical-aperture (NA) aplanatic microscope objectives. We propose two simple alte...
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| Published in | Optics letters Vol. 29; no. 12; p. 1318 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
United States
15.06.2004
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| Online Access | Get more information |
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| Summary: | Recently, Dorn et al. [Phys. Rev. Lett. 91, 233901 (2003)] demonstrated the significance of radially polarized doughnut beams in obtaining very small focal spots (with an area of approximately 0.26 lambda2) with high-numerical-aperture (NA) aplanatic microscope objectives. We propose two simple alternative ways to focus such radially polarized beams: a parabolic mirror and a flat diffractive lens. Because of their large apodization factor for a high NA, a significant further reduction in spot area (up to a factor of 1.76 at a NA of 1) compared with the aplanatic system can be achieved. |
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| ISSN: | 0146-9592 |
| DOI: | 10.1364/OL.29.001318 |