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

The longitudinal optical field is a peculiar physical phenomenon that is always involved with the domain of near-field optics. Due to its extraordinary properties, it has recently attracted increasing attention in research and application. In this work, the longitudinal fields generated by the evane...

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Published inChinese physics B Vol. 22; no. 4; pp. 258 - 263
Main Author 张明倩 王佳 田芊
Format Journal Article
LanguageEnglish
Published 01.04.2013
Subjects
Beams (radiation)
Computer simulation
Focal plane
Illumination
Mathematical analysis
Microscopy
Scanning
Vector analysis
Vectors (mathematics)
实验
物理现象
矢量衍射理论
空心光束
纵向电场
聚焦光束
近场光学
近场显微镜
Online AccessGet full text
ISSN1674-1056
2058-3834
1741-4199
DOI10.1088/1674-1056/22/4/044202

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Abstract The longitudinal optical field is a peculiar physical phenomenon that is always involved with the domain of near-field optics. Due to its extraordinary properties, it has recently attracted 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 vector diffraction theory, and their vector analysis is also carried out. The longitudinal fields on the focal plane are demonstrated experimentally using tip-enhanced scanning near-field microscopy. The simulation and experimental results show that the tightly focused radially polarized beam is suited to generating a stronger and purer longitudinal optical field at the focus.
AbstractList The longitudinal optical field is a peculiar physical phenomenon that is always involved with the domain of near-field optics. Due to its extraordinary properties, it has recently attracted 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 vector diffraction theory, and their vector analysis is also carried out. The longitudinal fields on the focal plane are demonstrated experimentally using tip-enhanced scanning near-field microscopy. The simulation and experimental results show that the tightly focused radially polarized beam is suited to generating a stronger and purer longitudinal optical field at the focus.
Author 张明倩 王佳 田芊
AuthorAffiliation State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China
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Cites_doi 10.1088/1674-1056/20/11/114211
10.1098/rspa.1959.0200
10.1103/PhysRevLett.79.645
10.1002/anie.200801605
10.1364/OPEX.12.003377
10.1088/1674-1056/21/2/024101
10.1063/1.1839646
10.1063/1.2794227
10.1117/1.1417974
10.1126/science.1058591
10.1007/3-540-44552-8
10.1103/PhysRevA.41.3727
10.1098/rspa.1959.0199
10.1143/JJAP.28.1730
10.1038/nphoton.2008.127
10.1103/PhysRevLett.74.2467
10.1103/PhysRevLett.75.826
10.1103/PhysRevA.11.1365
10.1364/AOP.1.000001
10.1364/OE.7.000077
10.1021/nl901839f
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Notes longitudinal optical field; high numerical aperture; focusing beam; polarization
The longitudinal optical field is a peculiar physical phenomenon that is always involved with the domain of near-field optics. Due to its extraordinary properties, it has recently attracted 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 vector diffraction theory, and their vector analysis is also carried out. The longitudinal fields on the focal plane are demonstrated experimentally using tip-enhanced scanning near-field microscopy. The simulation and experimental results show that the tightly focused radially polarized beam is suited to generating a stronger and purer longitudinal optical field at the focus.
Zhang Ming-Qian , Wang Jia, Tian Qian（ State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China）
11-5639/O4
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19
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SubjectTerms Beams (radiation)
Computer simulation
Focal plane
Illumination
Mathematical analysis
Microscopy
Scanning
Vector analysis
Vectors (mathematics)
实验
物理现象
矢量衍射理论
空心光束
纵向电场
聚焦光束
近场光学
近场显微镜
Title Experimental research on the longitudinal field generated by a tightly focused beam
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