Chin. Phys. B ›› 2013, Vol. 22 ›› Issue (4): 44202-044202.doi: 10.1088/1674-1056/22/4/044202

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Experimental research on the longitudinal field generated by a tightly focused beam

张明倩, 王佳, 田芊   

  1. State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China
  • 收稿日期:2012-04-25 修回日期:2012-09-19 出版日期:2013-03-01 发布日期:2013-03-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61177089 and 61227014) and the National Basic Research Program of China (Grant No. 2007CB936801).

Experimental research on the longitudinal field generated by a tightly focused beam

Zhang Ming-Qian (张明倩), Wang Jia (王佳), Tian Qian (田芊)   

  1. State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China
  • Received:2012-04-25 Revised:2012-09-19 Online:2013-03-01 Published:2013-03-01
  • Contact: Zhang Ming-Qian E-mail:zhangmq08@mails.tsinghua.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61177089 and 61227014) and the National Basic Research Program of China (Grant No. 2007CB936801).

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摘要： The longitudinal optical field is a peculiar physical phenomenon which is always involved with the domain of near-field optics. Due to its extraordinary properties, recently, it attracts increasing attention in research and application. In this work, the longitudinal fields generated by the evanescent illumination of tightly focused different polarized hollow beams are investigated. The focused light fields are numerically simulated according to the vector diffraction theory and their vector analysis is also carried out. And the longitudinal fields on the focal plane are demonstrated experimentally using a tip-enhanced scanning near-field microscopy. The simulation and experimental results show that the tightly focused radially polarized beam is suited to generate a stronger and purer longitudinal optical field at the focus.

关键词: longitudinal optical field, high numerical aperture, focusing beam, polarization

Abstract: The longitudinal optical field is a peculiar physical phenomenon which is always involved with the domain of near-field optics. Due to its extraordinary properties, recently, it attracts increasing attention in research and application. In this work, the longitudinal fields generated by the evanescent illumination of tightly focused different polarized hollow beams are investigated. The focused light fields are numerically simulated according to the vector diffraction theory and their vector analysis is also carried out. And the longitudinal fields on the focal plane are demonstrated experimentally using a tip-enhanced scanning near-field microscopy. The simulation and experimental results show that the tightly focused radially polarized beam is suited to generate a stronger and purer longitudinal optical field at the focus.

Key words: longitudinal optical field, high numerical aperture, focusing beam, polarization

中图分类号:  (Polarization)

  • 42.25.Ja
42.25.Fx (Diffraction and scattering) 07.79.Fc (Near-field scanning optical microscopes) 42.25.Bs (Wave propagation, transmission and absorption)