Generation of Multiple Focal Hole Segments Using Double-Ring Shaped Azimuthally Polarized Beam

K Lalithambigai,K B Rajesh,P M Anbarasan,Z Jaroszewicz,R C Saraswathi

doi:10.1155/2013/451715

K Lalithambigai, K B Rajesh + Show 3 more

Open Access

https://doi.org/10.1155/2013/451715

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Abstract

We investigated the focusing properties of a double-ring-shaped azimuthally polarized beam tightly focused with a high NA lens and a binary phase filter. We observe that by using 3 belts and 5 belts binary phase filters novel focal patterns including splitting of focal rings and multiring focus are obtained. We also found that a suitably designed phase structure can shift the focal rings along optical axis. The author expects such investigation is worthwhile for optical manipulation and material processing technologies.

Highlights

IntroductionGrowing interest in the generation of three-dimensional (3D) optical beams that are dark regions in space surrounded by light is driven by wide ranging applications including dark optical traps for atoms [1], manipulation, guiding and binding of microparticles and biological cells [2], and erase beams for super-resolution fluorescence microscopy [3]
Growing interest in the generation of three-dimensional (3D) optical beams that are dark regions in space surrounded by light is driven by wide ranging applications including dark optical traps for atoms [1], manipulation, guiding and binding of microparticles and biological cells [2], and erase beams for super-resolution fluorescence microscopy [3]. Such beams are known as twice-closed tubular optical structure (TCTOS) [4], optical bubbles [5], and hollow dark spherical spots [6]
It is seen from (1) that an additional radial electric field component is produced after introducing the phase modulation to the input double-ring-shaped azimuthally polarized beam [20]

Summary

Introduction

Growing interest in the generation of three-dimensional (3D) optical beams that are dark regions in space surrounded by light is driven by wide ranging applications including dark optical traps for atoms [1], manipulation, guiding and binding of microparticles and biological cells [2], and erase beams for super-resolution fluorescence microscopy [3]. Such beams are known as twice-closed tubular optical structure (TCTOS) [4], optical bubbles [5], and hollow dark spherical spots [6]. We observed that by properly designing the binary phase filters one can achieve many novel focal patterns including splitting of focal rings and generation of multiring structures

Theoretical Work

Analysis of Binary Phase Plate

Findings

Conclusion