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不同数值孔径下调控矢量光束聚焦场的反向构建

Backward Focus Engineering with Controlled Cylindrical Vector Beams under Different Numerical Apertures

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摘要

根据电磁辐射理论和矢量光场积分理论,研究了矢量光束聚焦场特性与聚焦透镜数值孔径之间的关系。在透镜焦场区设定电偶极子阵列和磁偶极子阵列,收集其辐射场并反向聚焦,通过调控与优化偶极子阵列参数,反演不同数值孔径透镜下的聚焦光场,获得了聚焦光针场、三维衍射受限光管场随透镜数值孔径的变化规律。研究结果表明,随着数值孔径的减小,光针场的纵向分量纯度、边缘斜率以及光针长度递减,半峰全宽递增,光管场依旧保持纯方位角偏振分布,且中空区域的半峰全宽递增。研究结果对在不同数值孔径下矢量光束聚焦的应用研究具有重要意义。

Abstract

Based on the electro-magnetic radiation theory and the optical vector field integral theory, the relation between the property of optical vector focal fields and the numerical aperture has been studied. The electric and magnetic dipoles arrays are located along the optical axis in the focal volume. The radiation fields of them are collected and focused reversely. By manipulating and optimizing the dipole parameters and reversing the focused optical field with different numerical apertures, we study the rule of the optical needle and diffraction limited three-dimensional optical tube changing with the numerical aperture. The results show that the longitudinal polarization component purity, the edge slope and optical needle length decline with the decrease of numerical aperture and the full-width at half-maximum increases. The optical tube field is still azimuthally polarized with an intensity null at the center. The length of the intensity null along radial direction will increase. The research has significance on the application of focused vector beam under different numerical apertures.

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中图分类号:O437

DOI:10.3788/aos201434.0114004

所属栏目:激光器与激光光学

基金项目:国家自然科学基金(11104144,11174147)、江苏省自然科学基金(BK2011721)、南京航空航天大学基本科研业务费(NZ2013206,NZ2013205)

收稿日期:2013-06-27

修改稿日期:2013-08-21

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作者单位    点击查看

刘雪宁:南京航空航天大学理学院应用物理系, 江苏 南京 211106
王吉明:南京航空航天大学理学院应用物理系, 江苏 南京 211106
赫崇君:南京航空航天大学理学院应用物理系, 江苏 南京 211106
刘友文:南京航空航天大学理学院应用物理系, 江苏 南京 211106

联系人作者:王吉明(jimingw@nuaa.edu.cn)

备注:刘雪宁(1990—),女,硕士研究生,主要从事偏振光学方面的研究。

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