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

2013 ◽  
Vol 2013 ◽  
pp. 1-4 ◽  
Author(s):  
K. Lalithambigai ◽  
R. C. Saraswathi ◽  
P. M. Anbarasan ◽  
K. B. Rajesh ◽  
Z. Jaroszewicz
Keyword(s):  
Optical Axis ◽  
Optical Manipulation ◽  
Processing Technologies ◽  
Binary Phase ◽  
Double Ring ◽  
Phase Filter ◽  
Polarized Beam ◽  
Azimuthally Polarized Beam ◽  
High Na Lens ◽  
Focusing Properties

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.

scholarly journals Partially Coherent, Radially Polarized Beam with Annular Apodization

2014 ◽  
Vol 2014 ◽  
pp. 1-5
Author(s):  
C. Mariyal ◽  
P. Suresh ◽  
K. B. Rajesh ◽  
T. V. S. Pillai
Keyword(s):  
Focal Depth ◽  
Focal Region ◽  
Debye Theory ◽  
Partially Coherent ◽  
Tight Focusing ◽  
Polarized Beam ◽  
Microscopy Techniques ◽  
Radially Polarized ◽  
High Na Lens ◽  
Focusing Properties

Based on the vectorial Debye theory, the tight focusing properties of partially coherent, radially polarized vortex beams are investigated in detail. In this paper, we propose to use an amplitude modulated filter in combination with a high NA lens to generate long focal depth in the focal region. Numerical results show that the generation of long focal depth of FWHM (22.08λ) is achieved, which finds useful application in microscopy techniques such as particle acceleration, laser processing, optical micromanipulation, and beam shaping.

Tight focusing of double ring shaped radially polarized beam with high NA lens axicon

2011 ◽  
Vol 43 (7) ◽  
pp. 1037-1040 ◽  
Author(s):  
K.B. Rajesh ◽  
N. Veerabagu Suresh ◽  
P.M. Anbarasan ◽  
K. Gokulakrishnan ◽  
G. Mahadevan
Keyword(s):  
Double Ring ◽  
Radially Polarized Beam ◽  
Tight Focusing ◽  
Polarized Beam ◽  
Radially Polarized ◽  
High Na Lens

Creation of super-length optical tube by phase modulated azimuthally polarized beam with multi-zone phase filter

Optik ◽  
2015 ◽  
Vol 126 (5) ◽  
pp. 554-557 ◽  
Author(s):  
K. Lalithambigai ◽  
P.M. Anbarasan ◽  
K.B. Rajesh
Keyword(s):  
Phase Filter ◽  
Polarized Beam ◽  
Azimuthally Polarized Beam
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