Design and fabrication of a double-axicon for generation of tailorable self-imaged three-dimensional intensity voids |
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Authors: | Ahluwalia B P S Cheong W C Yuan X C Zhang L S Tao S H Bu J Wang H |
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Institution: | School of Electrical & Electronic Engineering, Nanyang-Technological University, Nanyang Avenue, Singapore 639798, Singapore. |
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Abstract: | 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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