$Anomaly in a high-numerical-aperture diffractive focusing lens$

Anomaly in a high-numerical-aperture diffractive focusing lens

We show an anomalous behavior in a diffractive lens in which the spot size at the focus reaches a minimum at a numerical aperture of ~0.5 and then increases significantly at higher values. Theoretical and experimental results are presented, along with a comparison with refractive aplanatic lenses, i...

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Veröffentlicht in:	Optics letters 2000-04, Vol.25 (7), p.439-441
Hauptverfasser:	Oron, R, Guedalia, J L, Davidson, N, Friesem, A A, Hasman, E
Format:	Artikel
Sprache:	eng
Online-Zugang:	Volltext
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Beschreibung
Zusammenfassung:	We show an anomalous behavior in a diffractive lens in which the spot size at the focus reaches a minimum at a numerical aperture of ~0.5 and then increases significantly at higher values. Theoretical and experimental results are presented, along with a comparison with refractive aplanatic lenses, in which the anomaly does not appear to exist.
ISSN:	0146-9592 1539-4794
DOI:	10.1364/OL.25.000439