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

Anand Vijayakumar; Shanti Bhattacharya

doi:10.1117/1.OE.54.11.111310

21 September 2015 Compact generation of superposed higher-order Bessel beams via composite diffractive optical elements

Anand Vijayakumar, Shanti Bhattacharya

Author Affiliations +

Optical Engineering, Vol. 54, Issue 11, 111310 (September 2015). https://doi.org/10.1117/1.OE.54.11.111310

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.

Citation Download Citation

Anand Vijayakumar and Shanti Bhattacharya "Compact generation of superposed higher-order Bessel beams via composite diffractive optical elements," Optical Engineering 54(11), 111310 (21 September 2015). https://doi.org/10.1117/1.OE.54.11.111310

Published: 21 September 2015

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