基于石墨烯超表面的全范围门控太赫兹相位调制
Full-range Gate-controlled Terahertz Phase Modulations with Graphene Metasurfaces
摘要：
电磁波的局域相位控制是全息成像、偏振和波前操纵等一系列应用的基础，在光子学研究中具有重要意义。然而，目前可用的笨重的无源相位调制器仍然是光子集成的障碍。在这里，我们展示了在太赫兹（THz）制度，实现基于石墨烯的门调谐超薄反射超颖表面的全范围主动相位调制。一个端口谐振器模型，我们的全波模拟的支持下，揭示了我们的极端相位调制的基本机制，并指出可调谐光子器件的设计的一般策略。作为一个特定的例子，我们展示了一个门可调太赫兹偏振调制器的基础上，我们的石墨烯超颖表面。我们的研究结果铺平了道路，令人兴奋的光子应用的基础上主动相位操纵。
英文摘要：
Local phase control of electromagnetic wave, the basis of a diverse set of applications such as hologram imaging, polarization and wave-front manipulation, is of fundamental importance in photonic research. However, the bulky, passive phase modulators currently available remain a hurdle for photonic integration. Here we demonstrate full-range active phase modulations in the Tera-Hertz (THz) regime, realized by gate-tuned ultra-thin reflective metasurfaces based on graphene. A one-port resonator model, backed by our full-wave simulations, reveals the underlying mechanism of our extreme phase modulations, and points to general strategies for the design of tunable photonic devices. As a particular example, we demonstrate a gate-tunable THz polarization modulator based on our graphene metasurface. Our findings pave the road towards exciting photonic applications based on active phase manipulations.
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