Abstract
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.
Highlights
The mid-infrared band has attracted great interest of scientific researchers due to its important applications in sensing, communication, environmental monitoring, etc. [1], [2]
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 Fermi level of graphene is adjusted by applying an external voltage of 1 V to 5 V, which causes the blueshift of resonance wavelength
Summary
The mid-infrared band has attracted great interest of scientific researchers due to its important applications in sensing, communication, environmental monitoring, etc. [1], [2]. The mid-infrared band has attracted great interest of scientific researchers due to its important applications in sensing, communication, environmental monitoring, etc. The merging of surface plasmon polaritons (SPPs) and graphene-based metamaterials open a way for controlling and manipulating mid-infrared waves and mid-infrared devices [4]–[6]. Studies have shown that graphene-based metamaterials can excite SPPs waves from mid-infrared to THz band [4], [7]. Graphene SPPs exhibit the characteristics of dynamic tunability, high field confinement, and longer propagating distance [4], [8], which show great application potential in the design of tunable filters, plasma switches, modulators, and o[9]ther photoelectric devices [10]. Graphene-based plasmonic periodic nanostructures filters have attracted extensive attention because of their miniaturized forms and tuning characteristics, and such filters have a variety of applications [10]–[12]. Various filters based on graphene periodic structure have
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