Polarization of focal spot for high numerical aperture radially polarized beam

2015 ◽  
Author(s):  
Yun Xiao ◽  
Yunhai Zhang ◽  
Jian Chang ◽  
Tongda Wei
Keyword(s):  
Focal Spot ◽  
Numerical Aperture ◽  
High Numerical Aperture ◽  
Radially Polarized Beam ◽  
Polarized Beam ◽  
Radially Polarized

Focusing Characteristics of Laguerre-Gaussian Radially Polarized Beam Through High Numerical Aperture

2011 ◽  
Vol 40 (5) ◽  
pp. 798-802
Author(s):  
翁晓羽 WENG Xiao-yu ◽  
郭汉明 GUO Han-ming ◽  
董祥美 DONG Xiang-mei ◽  
隋国荣 SUI Guo-rong ◽  
高秀敏 GAO Xiu-min ◽  
...  
Keyword(s):  
Numerical Aperture ◽  
High Numerical Aperture ◽  
Radially Polarized Beam ◽  
Polarized Beam ◽  
Radially Polarized

Study of Focal Spot of Radially Polarized Beam

2010 ◽  
Vol 30 (12) ◽  
pp. 3597-3603
Author(s):  
阎杰 Yan Jie ◽  
鲁拥华 Lu Yonghua ◽  
王沛 Wang Pei ◽  
明海 Ming Hai
Keyword(s):  
Focal Spot ◽  
Radially Polarized Beam ◽  
Polarized Beam ◽  
Radially Polarized

scholarly journals Sharper Focal Spot for a Radially Polarized Beam Using Ring Aperture with Phase Jump

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Svetlana N. Khonina ◽  
Andrei V. Ustinov
Keyword(s):  
Focal Spot ◽  
Central Peak ◽  
Spot Size ◽  
Diffraction Limit ◽  
Destructive Interference ◽  
Phase Jump ◽  
Radially Polarized Beam ◽  
Annular Aperture ◽  
Polarized Beam ◽  
Radially Polarized

We study analytically and numerically in which way the width of ring aperture containing a phase jump affects the size and intensity of the focal spot generated with a radially polarized beam. It is shown that by means of destructive interference of beams coming from the different-phase rings it becomes possible to overcome the scalar diffraction limit corresponding to the first zero of the zero-order Bessel function. The minimal focal spot size (FWHM=0.33λ) is found to be attained when the annular aperture width amounts to 20% of the full-aperture radius. In this case, the side-lobe intensity is not larger than 30% of the central peak. A wider annular aperture with the phase jump introduced is also shown to form a focal spot not exceeding the diffraction limit for a narrow annular aperture, simultaneously providing a nearly six times higher intensity. In this case, the side lobes amount to 35% of the central peak.

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