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Optical fiber antenna generating spiral beam shapes

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7 Author(s)
Sarkar Pal, S. ; CSIR-Central Scientific Instruments Organization, Sector-30, Chandigarh 160030, India ; Mondal, S.K. ; Kumbhakar, D. ; Kumar, R.
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A simple method is proposed here to generate vortex beam and spiral intensity patterns from a Gaussian source. It uses a special type of optical fiber antenna of aperture ∼80 nm having naturally grown surface curvature along its length. The antenna converts linearly polarized Gaussian beam into a beam with spiral intensity patterns. The experimentally obtained spiral patterns with single and double spiral arms manifest the orbital angular momentum, l = ±1, 2, carried by the output beam. Such beam can be very useful for optical tweezer, metal machining, and similar applications.

Published in:

Applied Physics Letters  (Volume:104 ,  Issue: 3 )

Date of Publication:

Jan 2014

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