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Tightly focusing of spirally polarized Quadratic Bessel Gaussian beam through a dielectric interface |
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| Authors: | P. Suresh C. Mariyal Saraswathi K.B. Rajesh T.V.S. Pillai Z. Jaroszewicz |
| Affiliation: | 1. Department of ECE, National College of Engineering, Tirunelveli, Tamilnadu 627151, India;2. Department of Physics, Government Arts College, Dharmapuri, Tamilnadu, India;3. Department of Physics, Chikkanna Government Arts College, Tirupur, Tamilnadu 641602, India;4. Department of Physics, University College of Engineering, Nagercoil, Tamilnadu 629002, India;5. Institute of Applied Optics, Department of Physical Optics, and National Institute of Telecommunications, Warsaw, Poland |
| Abstract: | Based on vector diffraction theory, the tight focusing properties of spirally polarized axisymmetric Bessel-modulated Gaussian beam through a dielectric interface on high numerical aperture (NA) are investigated theoretically. The optical intensity distribution in the focal region of high NA objective lens is investigated in detail by numerical calculations. The results show that the focal shift induced in the focal region is by mismatch of refractive indices across the dielectric interface. It is also found that the optical intensity in focal region of spirally polarized Quadratic Bessel Gaussian (QBG) beam can be altered considerably by changing spiral parameter C that indicates the polarization spiral degree of the incident beam. |
| Keywords: | Quadratic Bessel Gaussian (QBG) beam Focal shift Polarization Focal spot |
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