Highly localized accelerating beams using nano-scale metallic gratings

作者：Naserpour Mahin; Zapata Rodriguez Carlos J^*; Zakery Abdolnaser; Miret Juan J

来源：Optics Communications, 2015, 334: 79-84.

DOI：10.1016/j.optcom.2014.08.024

• Wave propagation
• Invariant optical fields
• Diffraction theory

Spatially accelerating beams are non-diffracting beams whose intensity is localized along curvilinear trajectories, also incomplete circular trajectories, before diffraction broadening governs their propagation. In this paper we report on numerical simulations showing the conversion of a high-numerical-aperture focused beam into a nonparaxial shape-preserving accelerating beam having a beam-width near the diffraction limit. Beam shaping is induced near the focal region by a diffractive optical element that consists of a non-planar subwavelength grating enabling a Bessel signature.

• 出版日期2015-1-1