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Optical Engineering • Open Access

Generating super-Gaussian light needle of 0.36λ beam size and pure longitudinal polarization
Author(s): Tao Liu; Jiubin Tan; Jie Lin; Jian Liu

Paper Abstract

Through modulating the Bessel–Gaussian radially polarized vector beam by the cosine synthesized filter under a reflection paraboloid mirror system with maximum focusing semi-angle of π/2 , arbitrary-length super-Gaussian optical needles are created with consistent beam size of 0.36λ (full width at half maximum) and the electric field being pure longitudinally polarized (polarization conversion efficiency greater than 99%). Numerical calculations show that the on-axis intensity distributions are super-Gaussian, and the peak-valley intensity fluctuations are all within 1% for 4λ , 6λ , 8λ , and 10λ long light needles. The method remarkably improves the nondiffraction beam quality, compared with the subwavelength Gaussian light needle, which is generated by a narrow-width annular paraboloid mirror. Such a light beam may suit potential applications in particle acceleration, optical trapping, and microscopy.

Paper Details

Date Published: 11 July 2013
PDF: 6 pages
Opt. Eng. 52(7) 074104 doi: 10.1117/1.OE.52.7.074104
Published in: Optical Engineering Volume 52, Issue 7
Show Author Affiliations
Tao Liu, Harbin Institute of Technology (China)
Jiubin Tan, Harbin Institute of Technology (China)
Jie Lin, Harbin Institute of Technology (China)
Jian Liu, Harbin Institute of Technology (China)

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