Tight focusing properties of phase modulated azimuthally polarized doughnut Gaussian beam

The intensity distribution in the focal region of a high NA lens for the incident azimuthally polarized doughnut Gaussian beam transmitted through a multi belt spiral phase hologram (MBSPH) is studied on the basis of the vector diffraction theory. Here we report a new method that generates a needle...

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Bibliographic Details
Published in:Optical and quantum electronics 2016-11, Vol.48 (11), p.1-12, Article 507
Main Authors: Sundaram, C. Mohana, Prabakaran, K., Rajesh, K. B., Udhayakumar, M., Anbarasan, P. M., Musthafa, A. Mohamed
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Computer Communication Networks
Diffraction theory
Divergence
Electrical Engineering
Gaussian beams (optics)
Lasers
Light diffraction
Normal distribution
Optical Devices
Optical materials
Optical trapping
Optics
Photonics
Physics
Physics and Astronomy
Polarized light
X-rays
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Summary:The intensity distribution in the focal region of a high NA lens for the incident azimuthally polarized doughnut Gaussian beam transmitted through a multi belt spiral phase hologram (MBSPH) 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 of 0.48λ that propagates without divergence over a long distance of about 49λ in free space and designed a dedicated MBSPH to generate multiple focal spot of transversely polarized. 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 and to use in multiple optical trapping.
ISSN:0306-8919
1572-817X
DOI:10.1007/s11082-016-0765-x