Title :
Generation of accelerating beams using nano-scale metallic circular gratings
Author :
Naserpour, Mahin ; Zapata-Rodriguez, Carlos J. ; Miret, Juan J. ; Zakery, Abdolnaser
Author_Institution :
Dept. of Phys., Shiraz Univ., Shiraz, Iran
Abstract :
Spatially accelerating beams that are solutions to the Maxwell equations may propagate along incomplete circular trajectories, after which diffraction broadening takes over and the beams spread out. In this paper we report on numerical simulations that show 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 by a diffractive optical element that consists of a non-planar sub-wavelength grating enabling a Bessel signature.
Keywords :
Maxwell equations; diffraction gratings; diffractive optical elements; laser beams; nanophotonics; optical pulse shaping; Bessel signature; Maxwell equations; accelerating beam generation; beam shaping; diffraction broadening; diffractive optical element; high-numerical-aperture focused beam; incomplete circular trajectories; nanoscale metallic circular gratings; nonparaxial shape-preserving accelerating beam; nonplanar subwavelength grating; spatially accelerating beams; Acceleration; Gratings; Laser beams; Metals; Optical beams; Particle beams; Trajectory; diffraction theory; invariant optical fields; wave propagation;
Conference_Titel :
Transparent Optical Networks (ICTON), 2014 16th International Conference on
Conference_Location :
Graz
DOI :
10.1109/ICTON.2014.6876688
