title: Nondiffracting Bessel plasmons.
abstract: We report on the existence of nondiffracting Bessel surface plasmon polaritons (SPPs), advancing at either superluminal or subluminal phase velocities. These wave fields feature deep subwavelength FWHM, but are supported by high-order homogeneous SPPs of a metal/dielectric (MD) superlattice. The beam axis can be relocated to any MD interface, by interfering multiple converging SPPs with controlled phase matching. Dissipative effects in metals lead to a diffraction-free regime that is limited by the energy attenuation length. However, the ultra-localization of the diffracted wave field might still be maintained by more than one order of magnitude.
authors: Department of Optics, University of Valencia, Dr. Moliner 50, 46100 Burjassot, Spain. carlos.zapata@uv.es
authors: Carlos J
authors: CJ
authors: Zapata-Rodríguez
authors: Slobodan
authors: S
authors: Vuković
authors: Milivoj R
authors: MR
authors: Belić
authors: David
authors: D
authors: Pastor
authors: Juan J
authors: JJ
authors: Miret
mesh_terms: D003198:Computer Simulation; D004867:Equipment Design; D008027:Light; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000295:instrumentation*