Generating super-Gaussian light needle of 0.36λ beam size and pure longitudinal polarization

Tao Liu; Jiubin Tan; Jie Lin; Jian Liu

doi:10.1117/1.OE.52.7.074104

11 July 2013 Generating super-Gaussian light needle of 0.36λ beam size and pure longitudinal polarization

Tao Liu, Jiubin Tan, Jie Lin, Jian Liu

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Optical Engineering, Vol. 52, Issue 7, 074104 (July 2013). https://doi.org/10.1117/1.OE.52.7.074104

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.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Tao Liu, Jiubin Tan, Jie Lin, and Jian Liu "Generating super-Gaussian light needle of 0.36λ beam size and pure longitudinal polarization," Optical Engineering 52(7), 074104 (11 July 2013). https://doi.org/10.1117/1.OE.52.7.074104

Published: 11 July 2013

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