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Improvement of lens axicon's performance for longitudinally polarized beam generation by adding a dedicated phase
K B Rajesh1, Z Jaroszewicz, P M Anbarasan
1Department of Physics, Anna University Tirunelveli, Tirunelveli, India. rajeskb@gmail.com
Optics Express
|January 4, 2011
Abstract:
The focal field of high NA lens axicon with a binary-phase optical component is calculated by using vector diffraction theory. Numerical results show that for a radially polarized Bessel Gaussian input field, the proposed system generates a subwavelength (0.395λ) longitudinally polarized beam with large uniform depth of focus (approximately 6 λ).
