The subwavelength annular apertures (SAA) made on metallic layers by electron beam lithography with metal lift-off processes have been demonstrated. We have experimentally enhanced the Bessel beam distance through the SAA structure with large diameters.
© 2008 The Optical Society
(220.0220) Optical design and fabrication : Optical design and fabrication
(240.0240) Optics at surfaces : Optics at surfaces
(240.6680) Optics at surfaces : Surface plasmons
(220.4241) Optical design and fabrication : Nanostructure fabrication
Y. Yu, D. Lin, L. Huang, and C. Lee, "A Study of the Long Propagation Range Bessel Beam Generated by a Subwavelength Annular Aperture Structure," in Frontiers in Optics 2008/Laser Science XXIV/Plasmonics and Metamaterials/Optical Fabrication and Testing, OSA Technical Digest (CD) (Optical Society of America, 2008), paper JWD37.