We demonstrate a chip-scaled reversible terahertz (THz) resonator in which bending the flexible substrate outward breaks a diabolo array into a bowtie array. The resonance frequency shifts from 0.5 THz to nearly twofold (∼1.1 THz) as the resonator bends outward. Tunable THz spectroscopy achieved by mechanical bending is explained by theoretical simulation. For the cases of flattening/bending/reflattening, we analyze electrical current–voltage characteristic and optical properties in THz transmission spectra. While the current–voltage curves subsequently exhibit metal-, capacitor-, and tunneling-like results, THz transmittance shows twofold resonant behavior. In this behavior, we further demonstrated molecular sensing two materials, α-lactose and caffeine, on a single resonator. Considering the volume of the gap region, the detection limit of the molecules within the gap region for the bowtie antenna array is 80.5 and 64.4 pg for lactose and caffeine, respectively. The detection limit is determined by terahertz transmission change (ΔT/T₀) and resonance frequency shift (Δf/f_res) caused by the molecules within the gap region due to terahertz field confinement. We expect that this approach provides a more stable and functional platform for THz sensing applications.

中文翻译：

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用于太赫兹传感应用的基于聚对苯二甲酸乙二醇酯薄膜的双重等离子体谐振器

我们展示了一种芯片级可逆太赫兹 (THz) 谐振器，其中向外弯曲柔性基板将空竹阵列分解为蝴蝶结阵列。随着谐振器向外弯曲，谐振频率从 0.5 THz 移至近两倍（~1.1 THz）。通过理论模拟解释了通过机械弯曲实现的可调谐太赫兹光谱。对于展平/弯曲/再展平的情况，我们分析了太赫兹透射光谱中的电流-电压特性和光学特性。虽然电流-电压曲线随后表现出类似金属、电容器和隧道效应的结果，但太赫兹透射率显示出双重谐振行为。在这种行为中，我们进一步展示了在单个谐振器上分子传感两种材料，α-乳糖和咖啡因。考虑间隙区域的体积，领结天线阵列间隙区域内的分子对乳糖和咖啡因的检测限分别为 80.5 和 64.4 pg。检测限由太赫兹透射变化（ΔT / T ₀ ) 和共振频移 (Δ f / f _res ) 由间隙区域内的分子由于太赫兹场限制而引起。我们期望这种方法为太赫兹传感应用提供更稳定和功能更强大的平台。