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

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 0.5λ having large uniform focal depth of 48λ withou...

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Bibliographic Details
Published in:Optics letters 2012-03, Vol.37 (6), p.999-1001
Main Authors: Lalithambigai, K, Suresh, P, Ravi, V, Prabakaran, K, Jaroszewicz, Z, Rajesh, K B, Anbarasan, P M, Pillai, T V S
Format: Article
Language:English
Subjects:
Beams (radiation)
Channels
Focusing
Lenses
Mathematical analysis
Pupils
Vectors (mathematics)
Wavelengths
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Summary: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 0.5λ having large uniform focal depth of 48λ 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.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.37.000999