Generation of Sub Wavelength Focal Hole Segment Using Azimuthally Polarized Annular Multi Gaussian Beam by High NA Parabolic Mirror
Received: 05-07-2014 | Accepted: 02-10-2014 | Published: 30-03-2014
J. Environ. Nanotechnol., Volume 3, No (Special Issue) (August 2014) pp. 31-34
Abstract
We investigate the focusing properties of azimuthally polarized annular multi Gaussian beam with a high numerical aperture parabolic mirror are numerically investigated by vector diffraction theory. We observe that our proposed system generates a sub wavelength focal hole of 0.35 λ having large uniform focal depth of 10 λ. This kind of nondiffracting focal hole is called dark channel, which may have possible applications in particle acceleration, optical trapping and manipulating, single molecule imaging and high resolution imaging microscopy.
