Dancing of electromagnetic spectra driven by metasurfaces

• 来源期刊: 国家科学评论（英文版）
• 年，卷（期）: 2019,（3）
• 页码范围: 379-380
• 页数: 2页
• 语种: 英文
• DOI: 10.1093/nsr/nwz042

摘要

In 2011, Capasso proposed the concept of manipulating electromagnetic (EM) waves with phase modulation by an ultrathin flat metasurface composed of nanoantenna arrays [1].Later, re searchers developed different kinds of new metasurfaces, such as hyperbolic metasurfaces, tunable metasurfaces and non-linear metasurfaces [2].The development of metasurfaces has greatly enhanced the capability to manipulate EM waves with multiple functionalities on a flat surface.Non-linear metasurfaces combine the advantages of metasurface and non-linear EM phenomena, offering new degrees of freedom for the improve ment of the performance ofmetasurfaces.The non-linear response of metasurfaces can be used to realize functions such asfrequency mixing, harmony generation and ultrafast switching [3], which are essential for classical and quantum communication.However, the strength of the non-linear EM phenomena of the metasurfaces is a naturally given constant that cannot be changed after the metasurfaces have been fabricated.Further, the efficiency of non-linear EM phenomena in metasurfaces is usually very weak due to the limitation of the non-linear materials of the metasurfaces.