Song Zhengyong, Deng Yide, Zhou Yuanguo, Liu Zhaoyuan
Opt Express. 2019 Feb 18;27(4):5792-5797. doi: 10.1364/OE.27.005792.
We present a tunable metamodulator to work at terahertz frequencies by employing the dependency of toroidal dipolar resonance on the conductivity of vanadium dioxide. Numerical results show that toroidal dipolar resonance in the proposed planar structure can be observed around 0.288 THz in transmission spectrum. From the distribution of the anti-phase current flowing in the symmetric split ring resonator, the formation of toroidal dipole is validated. Our design may have potential applications in advanced terahertz devices, such as filter, plasmonic sensor, and fast switch.
我们展示了一种通过利用二氧化钒的电导率对环形偶极子共振的依赖性来在太赫兹频率下工作的可调谐超调制器。数值结果表明，在所提出的平面结构中，环形偶极子共振可以在传输光谱中约0.288太赫兹处被观察到。从对称开口环谐振器中反向电流的分布，验证了环形偶极子的形成。我们的设计可能在先进的太赫兹器件中具有潜在应用，如滤波器、等离子体传感器和快速开关。
