Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Phys Rev Lett. 2019 Aug 9;123(6):067403. doi: 10.1103/PhysRevLett.123.067403.
A class of plasmonic metasurfaces is introduced with the ability to tailor the dispersion surface of the associated plasmon-polariton into striking novel shapes. Examples include dispersion surfaces with hyperbolic curves, with multiple van Hove singularities of various types or with points of simultaneous spatiotemporal dispersion cancellation leading to unprecedented surface flatness. The latter effect, unseen before in linear passive systems, implies slow propagation of ultrasubwavelength wave packets of any shape devoid of longitudinal or lateral broadening, limited only by absorption.
介绍了一类等离子体超表面，它能够将相关等离子体激元的色散表面设计成惊人的新颖形状。例如，具有双曲曲线的色散表面、具有各种类型的多个范霍夫奇点的色散表面或具有同时消除时空色散的点的色散表面，从而实现前所未有的表面平整度。后一种效应在以前的线性无源系统中从未见过，这意味着任何形状的亚波长波包的传播速度都非常缓慢，没有纵向或横向展宽，仅受吸收限制。
