Electrical control of terahertz (THz) radiation for high-performance THz imaging is the key point. The spectrum suffers from a lack of active and available materials such as graphene have a severely limited bias range leading to restricted tuning. Therefore, here we demonstrated an efficient tunable device exploiting a triple bias layer for patterned graphene ribbons. Here, the patterned graphene acts as a tunable surface impedance leads to electrically controlled impedance matching between the device and free space. So, a dual-band absorption is obtained which is appropriately robust against incident angle and capable of adjusting absorption peaks. The major contribution of the design is capability of manipulating patterns periods via gate biasing. This causes providing additional degree of freedom compared to conventional graphene patterns. According to the simulation results, the proposed device shows excellent tuning operation via gate bias voltages.

中文翻译：

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通过外部偏置控制基于石墨烯的太赫兹双波段吸收器的模式周期

用于高性能太赫兹成像的太赫兹 (THz) 辐射的电气控制是关键点。光谱缺乏活性和可用材料，例如石墨烯，其偏置范围非常有限，导致调谐受限。因此，在这里我们展示了一种有效的可调装置，它利用三偏压层用于图案化石墨烯带。在这里，图案化的石墨烯充当可调表面阻抗，导致器件和自由空间之间的电控阻抗匹配。因此，获得了对入射角具有适当鲁棒性并且能够调整吸收峰的双带吸收。该设计的主要贡献是通过栅极偏置来操纵图案周期的能力。与传统的石墨烯图案相比，这导致提供额外的自由度。