Excitation of dark multipolar plasmonic resonances at terahertz frequencies.
Excitation of dark multipolar plasmonic resonances at terahertz frequencies.
复制标题
太赫兹频率暗多极等离子体共振的激发
DOI：
10.1038/srep22027
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发表时间：
2016-02-23
影响因子：
4.6
通讯作者：
Zhuang S
中科院分区：
文献类型：
--
作者：
Chen L;Wei Y;Zang X;Zhu Y;Zhuang S
在由波纹金属圆盘和C形偶极子谐振器组成的混合结构中，我们实验观察了暗多极欺骗局域表面等离子体共振的激发。由于结构的完美对称性，未耦合的波纹金属盘在透射谱中仅支持偶极共振。然而，当与放置在波纹金属圆盘附近的明亮的C形谐振腔耦合时，出现了暗的多极欺骗局域表面等离子体共振。这些激发的多极共振对C形谐振器与波纹金属盘之间的耦合距离的影响最小。通过改变C形谐振腔的角度和内盘半径来控制辐射模的谐振频率，这两个参数对局域表面等离子体的激发起主导作用。观察到多极欺骗局域等离子体激元共振从暗到辐射的这种转变，将在基于太赫兹的共振等离子体和超材料器件中找到潜在的应用。
We experimentally observe the excitation of dark multipolar spoof localized surface plasmon resonances in a hybrid structure consisting of a corrugated metallic disk coupled with a C-shaped dipole resonator. The uncoupled corrugated metallic disk only supports a dipolar resonance in the transmission spectrum due to perfect symmetry of the structure. However, the dark multipolar spoof localized surface plasmon resonances emerge when coupled with a bright C-shaped resonator which is placed in the vicinity of the corrugated metallic disk. These excited multipolar resonances show minimum influence on the coupling distance between the C-shaped resonator and corrugated metallic disk. The resonance frequencies of the radiative modes are controlled by varying the angle of the C-shaped resonator and the inner disk radius, both of which play dominant roles in the excitation of the spoof localized surface plasmons. Observation of such a transition from the dark to radiative nature of multipolar spoof localized plasmon resonances would find potential applications in terahertz based resonant plasmonic and metamaterial devices.