Diffractive and focusing properties of vector Laguerre–Gaussian beams with obstacle are investigated under tight focusing conditions. Using vector diffraction theory, intensity and polarization distributions near the focus at different orthogonal planes are calculated and analyzed for vector Laguerre–Gaussian beams. It is observed that the beam is able to compensate the distortion produced by obstacles when the size of the obstacle is small. The structural changes in the polarization distribution are not the same in different orthogonal planes. The polarization characteristics of the beam show a significant change when the size of the obstacle is large. A comparative study of the focusing and diffractive properties of vector Laguerre–Gaussian and vector Bessel–Gaussian beams has also been performed.
© 2011 Optical Society of America
Original Manuscript: February 14, 2011
Revised Manuscript: April 20, 2011
Manuscript Accepted: May 6, 2011
Published: June 10, 2011
Sunil Vyas, Masato Niwa, Yuichi Kozawa, and Shunichi Sato, "Diffractive properties of obstructed vector Laguerre–Gaussian beam under tight focusing condition," J. Opt. Soc. Am. A 28, 1387-1394 (2011)