Volume Fresnel zone plates fabricated by laser direct writing

Details Volume Fresnel zone plates fabricated by laser direct writing Volume Fresnel zone plates fabricated by laser direct writing

2011-06-28

2011-06-28

Amari, Alessandro (Department: 2872)

Optical: systems and elements

Diffraction

From zone plate

C264S001370

Reexamination Certificate

active

07969654

ABSTRACT:
A volume Fresnel zone plate and a method of producing such a device using a femtosecond laser for direct writing of zone plates. A volume zone plate has a number of Fresnel zone plate layers designed to focus light coherently to a single spot. Embodiments include both low numerical aperture (NA) and high NA zone plates, and provide a significant increase in overall diffraction efficiency over a single Fresnel zone plate.

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