Creating λ/3 focal holes with a Mach-Zehnder interferometer

被引：26

作者：

Engel, E ^{[1
]}

Huse, N ^{[1
]}

Klar, TA ^{[1
]}

Hell, SW ^{[1
]}

机构：

[1] Max Planck Inst Biophys Chem, Dept NanoBiophoton, D-37070 Gottingen, Germany

来源：

APPLIED PHYSICS B-LASERS AND OPTICS | 2003年 / 77卷 / 01期

关键词：

D O I：

10.1007/s00340-003-1239-y

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report the formation of doughnut-shaped focal intensity distributions with hole diameters of lambda/3.3 = 232 nm full-width-at-half-maximum. The doughnut shape is created by illuminating a high-numerical-aperture lens with the output of a Mach-Zehnder interferometer, in which half of the wavefront in each arm is phase retarded by pi. The focal intensities are probed with a point-like scatterer and compared with the predictions of a vectorial focusing theory. The orientation of the phase-discontinuity line with respect to the electric field determines whether a strong longitudinal or a vanishing electric field is produced at the focal point. Conditions are given for creating high-contrast focal holes at the sub-micron scale.

引用

页码：11 / 17

页数：7

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