Abstract
Optical needles produced by means of diffractive technology might display limited quality and uniformity. It has been suggested that the bulky optical elements present on these setups can be responsible of such behavior. In particular, issues such as the lack of flatness of the optical components, modulation errors in the holographic displays, and optical aberrations might degrade the quality of the needle. In this paper, we model how these variables affect the uniformity of the irradiance of the needle on the propagation axis. A comparison between experimental and computationally estimated results is provided.
Highlights
A large number of papers dealing with the design of long optical needles using high numerical aperture (NA) systems have been published [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17]
Focused needles produced with holographic devices present distortions and a non-uniform structure as a consequence of the use of bulky optical components
We analyzed how display modulation errors, holographic codification, lack of flatness of the optical components, light that is not properly polarized when passes through a polarizer and spherical aberration degrade the quality of the needle
Summary
A large number of papers dealing with the design of long optical needles using high numerical aperture (NA) systems have been published [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17]. This topic has attracted the attention of many groups because of potential applications in imaging, lithography or particle acceleration among others [18,19,20]. The developed software is available on-line as a supplementary material [23]
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