Optical and Quantum Electronics

, Volume 47, Issue 2, pp 179–184 | Cite as

Focusing properties of a 4Pi configuration system under the illumination of double ring shaped \(\hbox {LG}_{11}\) beam

  • P. Suresh
  • R. Thilagavathi
  • K. Gokulakrishnan
  • K. B. Rajesh
  • T. V. S. Pillai


Based on the vectorial Debye theory, the tight focusing properties of a 4Pi configuration system under the illumination of double ring shaped \(\hbox {LG}_{11}\) beam through a high numerical aperture objective are investigated numerically. The result shows that a spherical focal is generated by tightly focused azimuthally polarized \(\hbox {LG}_{11}\) beams in a 4Pi focusing system configuration. The numerical simulation result shows that it is possible to trap particle or to scan a specimen without moving the source (lenses or laser beams), we also generated multiple focal spot by changing the beam parameter (\(\beta \)) which is suitable for many optical applications.


Numerical aperture Spherical spot Focal shifting  Optical trapping 


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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • P. Suresh
    • 1
  • R. Thilagavathi
    • 2
  • K. Gokulakrishnan
    • 3
  • K. B. Rajesh
    • 4
  • T. V. S. Pillai
    • 5
  1. 1.Department of ECENational College of EngineeringTirunelveliIndia
  2. 2.Department of ECESri RangaPoopathi College of EngineeringVillupuramIndia
  3. 3.Department of ECE, Regional CentreAnna University, Tirunelveli RegionTirunelveliIndia
  4. 4.Department of PhysicsChikkanna Government Arts CollegeTirupurIndia
  5. 5.Department of PhysicsUniversity College of EngineeringNagercoilIndia

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