In this paper, a tunable graphene-based band-stop filter in the mid-infrared region was demonstrated, which consists of periodic structure based on bilayer graphene nanoribbons. Due to the unique tunable Fermi level of graphene, the resonance wavelength of the filter can be tuned over a wide range (10020 nm–15100 nm) with the applied voltage varying from 1 V to 5 V, realizing selectivity and tunability. The results also confirm that the presented structure can realize a narrow-band selective filter with a 3 dB bandwidth of 40 nm. Furthermore, the trough transmittance of stopband is close to zero and the transmittance of passband remains above 96.7%. Moreover, this filter is quite robust to the incident angles. The stopband is still extremely narrow as the incident angle varies from 0° to 60°, realizing wide-angle filtering. In addition, the fabrication processing and fabrication error tolerance are investigated, and it has proved that the filter is quite tolerant to fabrication deviations. Hence, the work has potential applications in narrowband filters, active plasmonic switches, and sensors in the mid-infrared region.

中文翻译：

---

基于中红外区双层石墨烯的宽范围可调窄带阻滤波器

在本文中，展示了一种在中红外区域基于石墨烯的可调带阻滤波器，它由基于双层石墨烯纳米带的周期性结构组成。由于石墨烯独特的可调费米能级，滤波器的共振波长可以在很宽的范围内（10020 nm-15100 nm）进行调谐，施加的电压从 1 V 到 5 V，实现选择性和可调性。结果还证实，所提出的结构可以实现具有 40 nm 的 3 dB 带宽的窄带选择性滤波器。此外，阻带的谷透射率接近于零，通带的透射率保持在96.7%以上。此外，该滤波器对入射角非常稳健。当入射角从0°到60°变化时，阻带仍然非常窄，实现了广角滤波。此外，研究了制造工艺和制造误差容限，证明该滤波器对制造偏差具有相当的容忍度。因此，这项工作在窄带滤波器、有源等离子体开关和中红外区域的传感器中具有潜在的应用。