Qiu Dan, Sun Shuai, Cheng Xuelan, Jin Xiaoyu, Qiao Yutong, Zhang Wei, Yang Dexing, Chen Xianzhong, Li Zeren, Li Jia, Yao Jianquan
Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology, Center for Advanced Material Diagnostic Technology, and College of Engineering Physics, Shenzhen Technology University, Shenzhen 518118, China.
School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710129, China.
Phys Chem Chem Phys. 2023 Aug 23;25(33):22319-22324. doi: 10.1039/d3cp02414h.
The combination of a flexible device and novel electromagnetic resonances offers new dimensions to manipulate electromagnetic waves and promises new device functionalities. In this study, we experimentally demonstrate a flexible metasurface that can support the bound state in the continuum (BIC) in the terahertz regime. The metasurface consists of toroidal dipole resonant units on top of the flexible polyimide substrate, which can support a terahertz Friedrich-Wintgen BIC resonance, and the resonance characteristics can be tuned by changing the parameters of the coupling unit among two resonant modes. The BIC resonances under different bending conditions are analyzed and compared, showing decent mechanical robustness. The sensing application is demonstrated by combining Fetal Bovine Serum with the flexible BIC metasurface. The measured minimum detectable concentration is 0.007 mg mL. Benefiting from the mechanical flexibility and BIC resonance characteristics, our approach can effectively manipulate terahertz waves and have potential applications in the realization of multifunctional and flexible photonic devices.
柔性器件与新型电磁共振的结合为操控电磁波提供了新的维度，并有望实现新的器件功能。在本研究中，我们通过实验展示了一种柔性超表面，其能够在太赫兹波段支持连续域中的束缚态（BIC）。该超表面由位于柔性聚酰亚胺衬底之上的环形偶极子谐振单元组成，可支持太赫兹Friedrich-Wintgen BIC共振，并且通过改变两个谐振模式之间耦合单元的参数可以调节共振特性。分析并比较了不同弯曲条件下的BIC共振，结果表明该超表面具有良好的机械鲁棒性。通过将胎牛血清与柔性BIC超表面相结合展示了其传感应用。测得的最低可检测浓度为0.007 mg/mL。得益于机械柔性和BIC共振特性，我们的方法能够有效操控太赫兹波，并在实现多功能柔性光子器件方面具有潜在应用。
