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Journal of Environmental Nanotechnology

(A Quarterly Peer-reviewed and Refereed International Journal)
ISSN(Print):2279-07 48; ISSN(Online):2319-5541

Generation of Tunable Focal Spot and Focal hole by Radially Polarized Axisymmetric Bessel-modulated Gaussian beam


In recent years, an Axisymmetric Bessel-modulated Gaussian beam with quadratic radial dependence (QBG beam) has attracted very much. In this paper, Focal shift in radially polarized QBG beam with radial variance phase wavefront is investigated theoretically byvector diffraction theory. The wavefront phase distribution is cosine function of radial coordinate. Simulation results show that the intensity distribution in focal region of the radially polarized QBG beam can be adjusted considerably by small beam parameter μ and phase parameterC.On increasingC, focus can shift along optical axis andfocal pattern changes remarkably. When μ increases, the focal spot may change to focal hole that alsoshift remarkably on increasing C. Focal shift distance fluctuates on increasing C, and fluctuation amplitude also changes simultaneously.

Article Type: Review Article

Corresponding Author: K.B.Rajesh 5  

Email: rajeskb@gmail.com

N.Veerabagu Suresh 1,  K.Prabakaran 2,  R.Chandrasekar 3,  Haresh M.Pandya 4,  K.B.Rajesh 5*.  

1. Department of ECE, Jayaraj Annapackiam CSI College of Engineering,Nazareth, TN, India.

2, 3, 4.

5. Department of Physics, Chikkanna Government Arts College, Tiruppur, TN, India.

J. Environ. Nanotechnol. Volume 2 (2013) 107- 112pp.
ISSN: 2279-0748 eISSN: 2319-5541
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