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Tight focusing of a double-ring-shaped, azimuth ally polarize d beam
Tight focusing a double-ring-shaped azimuth ally polarize d beam
2013/7/3
We study the focusing properties of a double-ring-shaped azimuthally polarized beam through an annular high NA objective lens. It is shown that a subwavelength focal hole (～ 0:5λ) with a quite long de...