多极展开
物理
偶极子
四极
太赫兹辐射
环面
激发
光学
计算物理学
量子电动力学
原子物理学
量子力学
等离子体
作者
Maria Cojocari,Anar K. Ospanova,В. И. Чичков,Miguel Navarro‐Cía,Andrei Gorodetsky,Alexey A. Basharin
出处
期刊:Physical review
日期:2021-08-05
卷期号:104 (7)
被引量:11
标识
DOI:10.1103/physrevb.104.075408
摘要
We present the numerical, theoretical, and experimental study of a terahertz metasurface supporting a pseudo-anapole. Pseudo-anapole effect arises when electric and toroidal dipole moments both tend to a minimum, instead of destructive interference between electric and toroidal dipole moments in conventional anapole mode. Such overlap allows resonance suppression of electric type radiation. Thus it becomes possible to study the multipoles of other families and higher order excitations. We estimate multipole contribution to the metasurface response via the multipole expansion method. The series is extended with such terms as mean-square radii and multipole interference. We also study the metasurface geometrical tunability. Via scaling, we demonstrate that it is possible to control the metasurface toroidal and electric responses independently. This in turn proves the fact that these multipoles have different physical origin. Moreover, we demonstrate that the proposed metasurface allows excitation of coherent magnetic dipole and electric quadrupole modes, which is crucial for planar cavities and lasing spasers in nanophotonics.
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