Abstract

We compare generation of a dark spot using focusing of beams with azimuthal polarizion, radial polarization with a vortex, and a circular polarization with either a first or second order vortex. By optimization of the amplitude-phase pupil, it is ascertained that azimuthal polarization is the most suitable one to obtain the diffraction bounded dark spot per se whose scalar approximation limit has FWHM=0.29λ. Consequently, for dark spot generation, this polarization plays the role of the radial polarization in creation of the diffraction-limited bright spot. Using azimuthal polarization, it is shown that an amplitude-phase filter allows generation of a subdiffractive dark spot in a prescribed finite area.

© 2012 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Sharper fluorescent super-resolution spot generated by azimuthally polarized beam in STED microscopy

Yi Xue, Cuifang Kuang, Shuai Li, Zhaotai Gu, and Xu Liu
Opt. Express 20(16) 17653-17666 (2012)

Engineering the smallest 3D symmetrical bright and dark focal spots

Svetlana N. Khonina and Ilya Golub
J. Opt. Soc. Am. A 30(10) 2029-2033 (2013)

How low can STED go? Comparison of different write-erase beam combinations for stimulated emission depletion microscopy

Svetlana N. Khonina and Ilya Golub
J. Opt. Soc. Am. A 29(10) 2242-2246 (2012)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Tables (4)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (6)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription