Bricchi, Erica, Mills, John D., Kazansky, Peter G., Klappauf, Bruce G. and Baumberg, Jeremy J.
Birefringent Fresnel zone plates in silica fabricated by femtosecond laser machining
Optics Letters, 27, (24), . (doi:10.1364/OL.27.002200).
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We demonstrate maskless, single-step fabrication of strongly birefringent Fresnel zone plates by focusing of femtosecond laser pulses deep within silica substrates. The process allows us to produce alternate zone rings directly by inducing a local refractive-index modification of the order of n~10-2 . The embedded zone plates shown in this Letter exhibit efficiencies that vary by as much as a factor of ~6 for orthogonal polarizations. Focal lengths of primary and secondary foci are shown to compare well with theory.
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