Sharp acoustic vortex focusing by Fresnel-spiral zone plates

We report the optimal focusing of acoustic vortex beams by using flat lenses based on a Fresnel-spiral diffraction grating. The flat lenses are designed by spiral-shaped Fresnel zone plates composed of one or several arms. The constructive and destructive interferences of the diffracted waves by the...

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Veröffentlicht in:	Applied physics letters 2018-05, Vol.112 (20)
Hauptverfasser:	Jiménez, Noé, Romero-García, Vicent, García-Raffi, Luis M., Camarena, Francisco, Staliunas, Kestutis
Format:	Artikel
Sprache:	eng
Schlagworte:	Acoustics Física Lenses Lents Mechanics Nonlinear optics Physics Àrees temàtiques de la UPC Òptica no lineal
Online-Zugang:	Volltext
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