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Tighter focus for a radially polarized light beam with suppressed side lobes of longitudinal component using absorbance modulation
Qiang Li,Xing Zhao * #,Bo Zhang,Yi Zheng,Liqiu Zhou,Zhiliang Fang
Institute of Modern Optics, Nankai University, Key Laboratory of Optical Information Science and Technology of Ministry of Education of China
*Correspondence author
#Submitted by
Subject:
Funding: Doctoral Program of Higher Education of China(No.No.20100031120033), National Natural Science Foundation of China (No.No.61108046)
Opened online:17 December 2013
Accepted by: none
Citation: Qiang Li,Xing Zhao,Bo Zhang.Tighter focus for a radially polarized light beam with suppressed side lobes of longitudinal component using absorbance modulation[OL]. [17 December 2013] http://en.paper.edu.cn/en_releasepaper/content/4574012
 
 
Recently many methods based on amplitude or phase modulation to reduce the focal spot and enhance the longitudinal ?eld component of a tight-focused radially polarized light beam have been suggested. But they all suffer from spot size limit 0.36λ/NA and large side lobes strength in longitudinal component. Here we report a new method of generating a tighter focused spot by focusing radially polarized and azimuthally polarized beams of different wavelengths on a thin photochromic ?lm through a high-numerical-aperture lens simultaneously. In this method, by suppressing the radial component and compressing the longitudinal component of radially polarized beam, absorbance modulation makes the ultimate spot size break the size limit of 0.36λ/NA with side-lobe intensity of longitudinal component below 1% of central-peak intensity. The theoretical analysis and simulation demonstrate that the focal spot size could be smaller than 0.1λ with nearly all radial component blocked at high intensity ratio of the two illuminating beams.
Keywords:Radial polarized beam;absorbance modulation;tight focus
 
 
 

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