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Focusing of Azimuthally Polarized Hyperbolic-Cosine-Gaussian Beam
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Abstract
The focusing properties of azimuthally polarized hyperbolic-cosine-Gaussian (ChG) beam are investigated theoretically by vector diffraction theory. Results show that the intensity distribution in focal region of azimuthally polarized ChG beam can be altered considerably by decentered parameters, and some novel focal patterns may occur for certain case. On increasing decentered parameters, ring shape of focal pattern can evolve into four-peak focal pattern, and azimuthal field component affects focal pattern more significantly than radial field component. Optical gradient force is also calculated to show that the focusing properties may be used in optical tweezers technique.
KeywordsFocusing PropertiesHyperbolic-Cosine-Gaussian BeamVector Diffraction Theory
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