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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 37, Iss. 6 — Mar. 15, 2012
  • pp: 999–1001

Generation of sub wavelength super-long dark channel using high NA lens axicon

K. Lalithambigai, P. Suresh, V. Ravi, K. Prabakaran, Z. Jaroszewicz, K. B. Rajesh, P. M. Anbarasan, and T. V. S. Pillai  »View Author Affiliations


Optics Letters, Vol. 37, Issue 6, pp. 999-1001 (2012)
http://dx.doi.org/10.1364/OL.37.000999


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Abstract

We investigate the focusing properties of a double-ring-shaped azimuthally polarized beam by a high numerical aperture (NA) lens axicon based on vector diffraction theory. We observe that our proposed system generates a sub wavelength focal hole of 0.5 λ having large uniform focal depth of 48 λ without any annular aperture. We also observed that the distribution of the total intensity near the focus has little variation with the degree of truncation β of the incident beam by the pupil. The authors expect such a super-long dark channel may find applications in optical, biological, and atmospheric sciences.

© 2012 Optical Society of America

OCIS Codes
(220.1000) Optical design and fabrication : Aberration compensation
(220.1230) Optical design and fabrication : Apodization
(260.5430) Physical optics : Polarization
(350.4600) Other areas of optics : Optical engineering

ToC Category:
Optical Design and Fabrication

History
Original Manuscript: October 24, 2011
Revised Manuscript: December 27, 2011
Manuscript Accepted: December 27, 2011
Published: March 6, 2012

Virtual Issues
Vol. 7, Iss. 5 Virtual Journal for Biomedical Optics

Citation
K. Lalithambigai, P. Suresh, V. Ravi, K. Prabakaran, Z. Jaroszewicz, K. B. Rajesh, P. M. Anbarasan, and T. V. S. Pillai, "Generation of sub wavelength super-long dark channel using high NA lens axicon," Opt. Lett. 37, 999-1001 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-6-999

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