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Optical Engineering

Compact generation of superposed higher-order Bessel beams via composite diffractive optical elements
Author(s): Anand Vijayakumar; Shanti Bhattacharya
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Paper Abstract

Binary composite diffractive optical elements with the functions of a spiral phase plate (SPP), an axicon, and a Fresnel zone lens (FZL) were designed with different topological charges. The element was designed in two steps. In the first step, the function of an SPP was combined with that of an axicon by spiraling the periods of the axicon with respect to the phase of the SPP followed by a modulo- phase addition with the phase of an FZL in the second step. The higher-order Bessel beams generated by the binary phase spiral axicon are superposed at the FZL’s focal plane. Although location of the focal plane is wavelength dependent, the radius of the flower-like beams generated by the element was found to be independent of wavelength. The element was fabricated using electron-beam direct writing. The evaluation results matched well with the simulation results, generating flower-like beams at the focal plane of the FZL.

Paper Details

Date Published: 21 September 2015
PDF: 8 pages
Opt. Eng. 54(11) 111310 doi: 10.1117/1.OE.54.11.111310
Published in: Optical Engineering Volume 54, Issue 11
Show Author Affiliations
Anand Vijayakumar, Indian Institute of Technology Madras (India)
Shanti Bhattacharya, Centre for NEMS and Nanophotonics (India)

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