Zapata-Rodríguez Carlos J, Vuković Slobodan, Belić Milivoj R, Pastor David, Miret Juan J
Department of Optics, University of Valencia, Dr. Moliner 50, 46100 Burjassot, Spain.
Opt Express. 2011 Sep 26;19(20):19572-81. doi: 10.1364/OE.19.019572.
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.
我们报道了非衍射贝塞尔表面等离激元极化激元（SPPs）的存在，其相速度可超光速或亚光速传播。这些波场具有深亚波长的半高宽（FWHM），但由金属/电介质（MD）超晶格的高阶均匀SPPs支持。通过干涉多个具有可控相位匹配的会聚SPPs，光束轴可重新定位到任何MD界面。金属中的耗散效应导致了一个由能量衰减长度限制的无衍射区域。然而，衍射波场的超局域化仍可能保持超过一个数量级。
