Effect of binary phase plate on incident radially polarized hollow Gaussian beam |
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Authors: | P. Suresh K. Gokulakrishnan C. Mariyal K.B. Rajesh T.V. Sivasubramonia Pillai |
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Affiliation: | 1. Department of ECE, National College of Engineering, Tirunelveli, Tamil Nadu 627151, India;2. University Departments, Anna University, Regional Centre, Tirunelveli, Tamil Nadu 627007 India;3. Department of Physics, Chikkanna Government Arts College, Tirupur, Tamil Nadu 641602, India;4. Department of Physics, University College of Engineering, Nagercoil, Tamil Nadu, India |
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Abstract: | Effect of a pure binary phase filter on the three-dimensional light intensity distributions in focal region is theoretically investigated in this paper. The results show that the proposed binary phase filter may induce flat top profile with large depth of focus and reduced focal spot by properly adjusting the geometrical parameters of the binary phase filter of incident radially polarized hollow Gaussian beam (HGB) beam. On the other hand, the HGB beam benefits the most from the use of an annulus. Such kind of system is potentially useful for lithography, imaging, optical data storage, optical trapping, optical excitation of molecules, or coupling to optical fibers. |
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Keywords: | Depth of focus Hollow gaussian beam Optical trapping |
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