基于石墨烯的太赫兹波调制器

THz modulator based on graphene

摘要:

石墨烯由于其优异的电学性能，在微波、毫米波、太赫兹波等领域显示出潜在的应用前景。本文设计了毫米波和亚太赫兹波频段的基于石墨烯的相位和幅值波导调制器。该石墨烯调制器可以通过调节石墨烯的表面阻抗来调控电磁波在波导中传播的振幅和相位；分析了石墨烯片的长度和位置对电磁波在波导中的透射和反射系数的影响，同时还分析了石墨烯化学势对电磁波在波导中传输和反射的影响。结果表明，通过调节石墨烯片的长度及其在矩形金属波导中的位置，可以调控调制器的反射系数、透射系数和透射相位调制范围，并满足器件级应用需求。

Abstract:

Graphene is attractive for the great potential in microwave, millimeter wave, terahertz wave and other fields due to their excellent electronical properties. In this paper, a rectangular metallic waveguide integrated with graphene for phase and amplitude modulator is designed in the millimeter and sub-terahertz waves frequencies. Through adjusting the surface impedance of graphene, the amplitude and phase of electromagnetic wave propagation in the waveguide can be controlled dynamically. Meanwhile, the influence of the length and position of the integrated graphene sheet on the transmission and reflection coefficients of electromagnetic wave in the waveguide is analyzed, as well as the effect of graphene chemical potential on the transmission and reflection of electromagnetic wave in waveguide. The results show that the reflection coefficient, transmission coefficient and transmission phase modulation range of the modulator can be customized by adjusting the length of graphene sheet and its position in rectangular metal waveguide, which meets the needs of device level applications.