A liquid crystal-modulated Fano resonator is designed, which has high sensitivity, tunable operating band and adjustable sensing range at the same time. The Fano resonator is constructed by attaching a ring above a ma...
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A liquid crystal-modulated Fano resonator is designed, which has high sensitivity, tunable operating band and adjustable sensing range at the same time. The Fano resonator is constructed by attaching a ring above a main channel and connecting a groove beneath it. With the interaction of the discrete mode provided by the ring and the continuous mode provided by the groove, a Fano resonator can be produced with a pretty high sensitivity. Moreover, by infiltrating liquid crystals into the inner layer of the ring cavity, the resonant frequency of the Fano resonator can be shifted freely by adjusting the biasing voltage across the liquid crystals. The margin of the shifted frequency can achieve 57 GHz for the first-order resonance around 1.609 THz, and 140 GHz for the second-order resonance around 2.694 THz, respectively. Meanwhile, the liquid crystal infiltrated Fano resonator achieves a favorable sensitivity in terms of figure of merit (FOM) as high as 6.02 x 104. The novel Fano resonator is pretty attractive for sensing applications that require high sensitivity, tunable operating band and adjustable sensing range at the same time, paving the way for developing flexible terahertz systems in the coming future.
A tunable material black phosphorus (BP) terahertz (THz) half-ring Fano resonator is proposed, exhibiting enhanced sensitivity, tunable frequency parameters, and the flexible sensing range. A half-ring is positioned a...
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A tunable material black phosphorus (BP) terahertz (THz) half-ring Fano resonator is proposed, exhibiting enhanced sensitivity, tunable frequency parameters, and the flexible sensing range. A half-ring is positioned above the main channel, while a groove is excavated beneath it to produce the Fano resonance. The discrete mode of the half-ring is coupled with the continuous mode of the groove, leading to a significantly enhanced sensitivity. This sensor can pick up subtle changes in the surrounding environment. Additionally, the incorporation of BP into the half-ring positioned above the channel enables the flexible adjustment of the Fano resonator's resonant frequency. This adjustment is achieved through the manipulation of the electron doping concentration of the BP material. At the third-order resonance around 5.81 THz, the frequency shift margin can reach 160 GHz. Adjusting the structural parameters of the Fano resonator, such as the radius of its outer ring, the distance of this ring to the main channel, and the groove's height, significantly affects its transmission spectrum. The Fano resonator demonstrates its considerable potential for applications in the field of integrated electronics. It not only provides an innovative design perspective, but also lays the foundation for the study of THz systems. A tunable black phosphorus (BP) terahertz (THz) Fano resonator using a half-ring structure is proposed, offering high sensitivity and dynamic frequency tunability. Adjusting BP's electron doping concentration results in a 160 GHz shift in resonant frequency, making it promising for integrated electronics and THz system *** condensed the text to 60 words or less while retaining the original meaning as much as possible. image (c) 2024 WILEY-VCH GmbH
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