AI 中文总结
该研究提出扭转可控木堆光子晶体，通过可调扭转角实现三种光子 regime 转变，建立其为三维扭转工程光子学的通用平台。
AI 中文摘要
三维木堆光子晶体是实现光子带隙最成功的结构之一，但其光学响应传统上由制造过程中确定的几何形状固定。本文引入了一种扭转可控的木堆光子晶体，其中相邻棒层之间的相对角取向是额外的原位可调几何自由度。我们采用适用于具有旋转倒易晶格的多层结构的严格耦合波分析扩展方法，系统研究了透射光谱随扭转角的演化。结果表明，扭转使结构经历三种不同的光子 regime：完全对齐构型下，宽频率区间呈现近 unity 透射；中间扭转角时，光谱出现具有特征 Fano 线型、高品质因子和显著角敏感性的强色散共振；当扭转角接近90°时，恢复传统木堆结构，这些共振演变为三维光子晶体特有的宽光子带隙。基于倒易晶格的简化分析模型准确再现了数值计算中观察到的主要共振变化。我们的结果证明了从宽带透射到光子带隙通过中间 Fano 共振 regime 的连续扭转诱导转变，确立了扭转木堆作为三维扭转工程光子学的通用平台。
英文摘要
Three-dimensional woodpile photonic crystals constitute one of the most successful architectures for realizing photonic band gaps, yet their optical response is traditionally fixed by the geometry established during fabrication. Here, we introduce a twist-controlled woodpile photonic crystal in which the relative angular orientation between successive rod layers acts as an additional, in situ-tunable geometrical degree of freedom. Using an extension of rigorous coupled-wave analysis adapted to multilayer structures with rotated reciprocal lattices, we systematically investigate the evolution of the transmission spectrum as a function of twist angle. We show that twisting drives the structure through three distinct photonic regimes. In the fully aligned configuration, broad frequency intervals exhibit near-unity transmission. At intermediate twist angles, the spectrum becomes populated by strongly dispersive resonances displaying characteristic Fano line shapes, high quality-factor and pronounced angular sensitivity. As the twist angle approaches 90°, the conventional woodpile structure is recovered, and these resonances evolve into a broad photonic stop band characteristic of three-dimensional photonic crystals. A simplified analytical model based on reciprocal-lattice considerations accurately reproduces the principal resonance modification observed in the numerical calculations. Our results demonstrate a continuous twist-induced transition from broadband transmission to photonic stop bands through an intermediate Fano-resonant regime, establishing twisted woodpiles as a versatile platform for three-dimensional twist-engineered photonics.
