Abstract
We show the power of spirally polarized doughnut beams as a tool for
tuning the field distribution in the focus of a high numerical aperture (NA)
lens. Different and relevant states of polarization as well as field
distributions can be created by the simple turning of a λ/2 retardation wave
plate placed in the excitation path of a microscope. The realization of such a
versatile excitation source can provide an essential tool for nanotechnology
investigations and biomedical experiments.
© 2017 Chinese Laser Press
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