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Generation of needle of transversely polarized beam using complex spiral phase mask

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Abstract

The intensity distribution in the focal region for the tight focusing of needle of azimuthally polarized beam with complex-spiral phase mask is studied on the basis of the vector diffraction theory. Here we report a new method that generates a needle of transversely polarized light beam with sub diffraction beam size (0.442 \(\uplambda \)) that propagates without divergence over a long distance (of about 12.6 \(\uplambda \)) in free space (NA \(=\) 0.95). The authors also expect such a light needle of transversely polarized beam may find its application when using optical materials or instruments responsive to the transversal field only.

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Acknowledgments

One of the authors K. Lalithambigai expresses her sincere thanks to UGC-Basic Scientific Research (BSR), New Delhi, India (UGC Letter No. 11-142/2008(BSR)) for financial support.

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Authors and Affiliations

  1. Department of Physics, Periyar University, Salem , 636 011, Tamilnadu, India

    K. Lalithambigai & P. M. Anbarasan

  2. Department of Physics, Chikkanna Government Arts College, Trippur , 641 602, Tamilnadu, India

    K. B. Rajesh

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  1. K. Lalithambigai
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  2. P. M. Anbarasan
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  3. K. B. Rajesh
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Correspondence to K. Lalithambigai.

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Lalithambigai, K., Anbarasan, P.M. & Rajesh, K.B. Generation of needle of transversely polarized beam using complex spiral phase mask. Opt Quant Electron 47, 1027–1033 (2015). https://doi.org/10.1007/s11082-014-9958-3

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  • DOI: https://doi.org/10.1007/s11082-014-9958-3

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