Special Section on Complex Light

Compact generation of superposed higher-order Bessel beams via composite diffractive optical elements

[+] Author Affiliations
Anand Vijayakumar, Shanti Bhattacharya

Centre for NEMS and Nanophotonics, Indian Institute of Technology Madras, Department of Electrical Engineering, Chennai 600036, India

Opt. Eng. 54(11), 111310 (Sep 21, 2015). doi:10.1117/1.OE.54.11.111310
History: Received April 13, 2015; Accepted August 11, 2015
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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-2π 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.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Anand Vijayakumar and Shanti Bhattacharya
"Compact generation of superposed higher-order Bessel beams via composite diffractive optical elements", Opt. Eng. 54(11), 111310 (Sep 21, 2015). ; http://dx.doi.org/10.1117/1.OE.54.11.111310


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