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Multifunctional diffractive optical elements for the generation of higher order Bessel-like-beams
Anand Vijayakumar,
Published in SPIE
2015
Volume: 9370
   
Abstract
Higher Order Bessel Beams (HOBBs) have many useful applications in optical trapping experiments. The generation of HOBBs is achieved by illuminating an axicon by a Laguerre-Gaussian beam generated by a spiral phase plate. It can also be generated by a Holographic Optical Element (HOE) containing the functions of the Spiral Phase Plate (SPP) and an axicon. However the HOBB's large focal depth reduces the intensity at each plane. In this paper, we propose a multifunctional Diffractive Optical Element (DOE) containing the functions of a SPP, axicon and a Fresnel Zone Lens (FZL) to generate higher efficiency higher order Bessel-like-beams with a reduced focal depth. The functions of a SPP and a FZL were combined by shifting the location of zones of FZL in a spiral fashion. The resulting element is combined with an axicon by modulo-2π phase addition technique. The final composite element contains the functions of SPP, FZL and axicon. The elements were designed with different topological charges and fabricated using electron beam direct writing. The elements were tested and the generation of a higher order Bessel-like-beams is confirmed. Besides, the elements also generated high quality donut beams at two planes equidistant from the focal plane of the FZL. © 2015 SPIE.
About the journal
JournalData powered by TypesetProceedings of SPIE - The International Society for Optical Engineering
PublisherData powered by TypesetSPIE
ISSN0277786X
Open AccessNo
Concepts (18)
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    Angular momentum
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    Bessel functions
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    Density (optical)
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    Diffractive optical elements
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    Electron beam lithography
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    Electron beams
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    Laser beams
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    Lenses
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    NANOPHOTONICS
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    ADDITION TECHNIQUE
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    BEAM-SHAPING
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    COMPOSITE ELEMENT
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    ELECTRON BEAM DIRECT WRITING
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    LAGUERRE GAUSSIAN BEAMS
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    RING PATTERNS
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    SPIRAL PHASE PLATES
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    TOPOLOGICAL CHARGES
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    Gaussian beams