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Opt Lett. 2006 Apr 1;31(7):987-9.

Design and fabrication of a double-axicon for generation of tailorable self-imaged three-dimensional intensity voids.

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  • 1School of Electrical & Electronic Engineering, Nanyang-Technological University, Nanyang Avenue, Singapore 639798, Singapore.


We propose a new design for fabrication of a highly power-efficient double axicon to generate self-imaged three-dimensional intensity voids along the propagation of a beam. The conventional conical structure of an axicon is modified and shaped like an axiconlike structure with a double-gradient surface profile. The gradient conical surfaces generate Bessel beams with varying radial wave vectors that are superimposed and interfere to generate a sequence of three-dimensional intensity voids. The proposed element was fabricated using electron-beam lithography, and experimental verification of the design is reported.

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