کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
734307 | 1461618 | 2016 | 8 صفحه PDF | دانلود رایگان |
• Subwavelength multiple focusing generated in a high numerical aperture system.
• The multi-focus can be easily achieved by Airy beam and a modulating function.
• The subwavelength focusing is highly controlled.
The focusing performance of a modulated polarized Airy beam is explored by using the Richards and Wolf vectorial diffraction model in a high numerical aperture system. The multiple foca appeared on the focal plane or along the optical axis when a complex amplitude modulating function was introduced. Two focusing spots with long-focal-depth were additionally observed due to the Airy beam and complex amplitude modulation. The distance between the focuses were changed from 1.15λ to 3.56λ with FWHM of 0.9λ for one-dimensional linear polarized incident beam and from 1.15λ to 3.64λ for two-dimensional beam. The multiple focusing spots are expected to apply in the field of optical trapping and particle acceleration.
Journal: Optics & Laser Technology - Volume 81, July 2016, Pages 107–114