Graphene-Based Magnetically Tunable Broadband Terahertz Absorber

Abstract

This study proposes a broadband absorber based on graphene and one-dimensional photonic crystal (1DPC) to achieve magnetically tunable broadband absorption in the terahertz (THz) frequency range. The performance is analyzed using the 4×4 transfer matrix method, demonstrating that the proposed absorber operates in a broadband range of 3.34 to 4.68 THz for left-handed circularly polarized (LCP) waves with an absorption greater than 90%. The localized THz wave produces absorption peaks, achieves broadband with high absorption, and is tuned dynamically by varying the magnetic field. This work has potential for many applications, such as broadband filters, anti-radar stealth, and sensors.

Review of Broadband Metamaterial Absorbers: From Principles, Design Strategies, and Tunable Properties to Functional Applications

“…In addition, the absorber reaches the best absorption at B = 7 T, but the overall broadband absorption is still below 90%. [ 102 ] All these results show that the cascaded or stacked structures based on graphene can achieve magnetically tunable broadband absorption performance. Unfortunately, the overall structure is much more complicated, so even for materials like graphene, the results of similar works are still not much due to the complex form.…”

“…Besides, some results have proved that graphene‐based BMAs also perform well in magnetically tuning. [ 102 ]…”

“…The magnetization model of this structure is given in Figure 16d. [ 102 ] Figure 16e shows the absorption of several cells of different configurations at magnetic induction strength B = 0 T. From the figure, it is known that cascading several cells has the best BMA absorption. And in Figure 16f, the tunable absorption of the device is analyzed for different magnetic induction strengths and two polarization states.…”

“…Thus the ideas of tunable (or reconfigurable) BMAs have been given and suggested to overcome this dilemma. [90][91][92] By integrating some active components (or materials) into the structural engineering designs of BMAs, the absorption behavior of BMAs could be dynamically controlled or adjusted via applying external stimuli, such as temperature/thermal, [93][94][95][96] electric field, [97][98][99] magnetic field, [100][101][102] bias voltage, [103][104][105] applied stress/force, [106][107][108][109] pump beam, [110][111][112] etc.…”

Magneto-tunable terahertz absorption in single-layer graphene: A general approach

“…The electromagnetic waves technology, especially in THz region ranging from 0.1 to 10 THz is of most interest in many fields and applications particularly in remote control, sensing and detectors which are mostly related to absorption properties of the material [1,2,3,4,5]. Moreover, materials that strongly interact with light giving appropriate and desirable responses in a broad range of frequencies play a critical role in science and technology such as, photonics security, photodetectors, sensors, photovoltaics and absorbers [6,7].…”