AI 中文总结
提出光栅耦合双曲超材料，结合CsPbBr₃层与靶心光栅，通过高k模式和双曲共振锥增强闪烁信号，宽带增强超3倍，峰值约5倍，为高性能闪烁体提供实用途径。
AI 中文摘要
闪烁体是X射线、γ射线和高能粒子探测的必需材料，应用范围涵盖医学成像、安全筛查到高能物理领域。传统闪烁体的主要局限在于，由于各向同性发射及闪烁体-探测器界面处的全内反射，闪烁光子的提取效率低下。本文提出并数值研究了一种光栅耦合的双曲超材料（HMM），其中闪烁介质CsPbBr₃构成其组分层之一。该结构通过高k模式实现的宽带珀塞尔增强同时增强自发发射，并通过将发射辐射沿双曲共振锥引导来改善光提取，同时采用靶心光栅提供高效的远场耦合。有限差分时域模拟预测，在CsPbBr₃发射带内，探测到的闪烁信号宽带增强超过3倍；与等效体块闪烁体相比，在523 nm发射波长附近，峰值增强约为5倍。所提出的多层结构与成熟的薄膜沉积及纳米制造技术兼容，对制造引起的层厚变化具有鲁棒性，且可扩展以容纳更大体积的闪烁材料，为辐射探测和成像应用的高性能闪烁体提供了实用途径。
英文摘要
Scintillators are indispensable for the detection of X-rays, $γ$-rays, and energetic particles in applications ranging from medical imaging and security screening to high-energy physics. A major limitation of conventional scintillators is the inefficient extraction of scintillation photons caused by isotropic emission and total internal reflection at the scintillator--detector interface. Here, we propose and numerically investigate a grating-coupled hyperbolic metamaterial (HMM) in which the scintillation medium CsPbBr$_3$ forms one of the constituent layers. The proposed architecture simultaneously enhances spontaneous emission through broadband Purcell enhancement enabled by high-$k$ modes and improves optical extraction by directing the emitted radiation along the hyperbolic resonance cone, with a bullseye grating providing efficient far-field outcoupling. Finite-difference time-domain simulations predict broadband enhancement of the detected scintillation signal exceeding threefold across the CsPbBr$_3$ emission band, with a peak enhancement of approximately fivefold around the emission wavelength of 523 nm compared with an equivalent bulk scintillator. The proposed multilayer architecture is compatible with established thin-film deposition and nanofabrication techniques, robust against fabrication-induced layer-thickness variations, and scalable to accommodate larger volumes of scintillating material, providing a practical route toward high-performance scintillators for radiation detection and imaging applications.
Comments27 pages, 12 figures
