窄带
超材料
太赫兹辐射
超宽带
材料科学
光电子学
太赫兹超材料
宽带
人工神经网络
超材料吸收剂
可调谐超材料
计算机科学
电子工程
声学
物理
电信
工程类
光学
人工智能
远红外激光器
激光器
作者
RUi Yan,Kai wang,qi luo,Jing Li
出处
期刊:Journal of The Optical Society of America B-optical Physics
[The Optical Society]
日期:2024-12-23
卷期号:42 (2): 394-394
摘要
Supported by deep neural networks (DNNs), a simulation study on an ultra-wideband (UWB) to ultra-narrowband (UNB) switchable terahertz metamaterial absorbers (THz MAs) was designed and optimized. By leveraging the phase transition properties of vanadium dioxide (VO 2 ), the device achieves nearly perfect absorption, switching between UWB and UNB modes. Finite element analysis was used to simulate and analyze the constructed model. Simulation results indicate that when VO 2 is in its metallic state, the device functions as a UWB absorber with an absorption bandwidth of 11.54 THz over the 3.88–15.42 THz range, achieving an absorption rate exceeding 90% and a relative bandwidth (RBW) of 119.6%. When VO 2 is in its insulating state, the device switches to a UNB absorber, reaching an absorption rate close to 100% at 13.927 THz. In this state, material detection was conducted, revealing that the device has a maximum refractive index sensitivity ( S ) of 0.33 THz/RIU and a corresponding quality factor ( Q ) of up to 515.8, enabling high sensing functionality. Its absorption performance is insensitive to TE and TM polarizations. Additionally, the effects of incident and polarization angles on the operating characteristics were studied. The proposed absorber demonstrates excellent polarization insensitivity, angle stability, and UWB and UNB advantages, offering valuable insights for new multifunctional THz device research. It holds significant application potential in short-range wireless THz communication, ultra-fast optical switching, sensing, transient spectroscopy, and electromagnetic stealth.
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