Sub-wavelength focal spot with long depth of focus generated by radially polarized, narrow-width annular beam
We demonstrate the formation of a sub-wavelength focal spot with a long depth of focus using a radially polarized, narrow-width annular beam. Theoretical analysis predicts that a tighter focal spot (approximately 0.4 lambda) and longer depth of focus (more than 4 lambda) can be formed by a longitudi...
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| Veröffentlicht in: | Optics express 2010-03, Vol.18 (5), p.4518-4525 |
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| Hauptverfasser: | , , |
| Format: | Artikel |
| Sprache: | eng |
| Online-Zugang: | Volltext |
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