Creation of Super Long Transversely Polarized Optical Needle Using Azimuthally Polarized Multi Gaussian Beam. (June 2016)

• Record Type: Journal Article
• Authors: Sundaram, C. M.; Prabakaran, K.; Anbarasan, P. M.; Rajesh, K. B.; Musthafa, A. M.
• Is Part Of: Chinese physics letters. Volume 33:Number 6(2016:Jun.)
• Publication Date: 2016-06
• Subjects: 42.25.Bs -- 42.25.Ja -- 42.79.Ag; Physics -- Periodicals; Electronic journals; 530.05
• DOI: 10.1088/0256-307X/33/6/064203
• Languages: English
• ISSNs: 0256-307X

Abstract

Abstract : The intensity distribution in the focal region of a high-NA lens for the incident azimuthally polarized multi Gaussian beam transmitted through a multi belt spiral phase hologram is studied on the basis of the vector diffraction theory. Here we report a new method used to generate a needle of transversely polarized light beam with sub diffraction beam size of 0.366λ that propagates without divergence over a long distance of about 22λ in free space. We also expect that such a light needle of transversely polarized beam may find its applications in utilizing optical materials or instruments responsive to the transversal field only.