AI 中文总结
研究利用层状绝缘 CrCl₃ 的固有介电各向异性，实现 300 至 1700nm 超宽带偏振分辨光探测。通过多种测量揭示激子跃迁特性，产生可调偏振度，建立光 - 物质相互作用，确立介电各向异性等为相关光探测器和光子系统的设计原则。
AI 中文摘要
同时探测光的光谱和偏振特性对集成成像和光子技术非常重要，但通常需要复杂的多组件架构。本文证明层状绝缘 CrCl₃ 的固有介电各向异性能实现 300 至 1700nm 波长范围内的超宽带偏振分辨光探测。光响应由长寿命配体场激子控制，其微秒级寿命产生超过 4.5×10⁴ 的光电导增益。通过多种测量揭示不同激子跃迁有不同光学偶极取向，产生与激发能量相关的面内偏振轴旋转等。这些效应产生 -90% 到 +75% 的高度可调偏振度，建立了层状磁范德华绝缘体中固有的三维矢量光 - 物质相互作用。这些发现确立了介电各向异性和激子偶极工程是紧凑超宽带偏振敏感光探测器和多功能范德华光子系统的强大设计原则。
英文摘要
Simultaneous detection of the spectral and polarization properties of light is highly desirable for integrated imaging and photonic technologies but typically requires complex multi-component architectures. Here, we demonstrate that the intrinsic dielectric anisotropy of layered insulating CrCl3 enables ultrabroadband polarization-resolved photodetection spanning wavelengths from 300 to 1700 nm. The photoresponse is governed by long-lived ligand-field excitons, whose microsecond-scale lifetime produces a photoconductive gain exceeding 4.5 x 10^4. By combining wavelength-, polarization-, and angle-resolved optoelectronic measurements, we reveal that distinct ligand-field and higher-energy excitonic transitions possess different optical dipole orientations, leading to excitation-energy-dependent rotation of the in-plane polarization axis. Furthermore, oblique illumination activates out-of-plane optical dipoles, while competing excitonic transitions with distinct dipole orientations drive wavelength-dependent rotation and reversal of the polarization anisotropy. Together, these effects produce a highly tunable degree of polarization ranging from -90% to +75%, establishing intrinsic three-dimensional vectorial light-matter interactions in a layered magnetic van der Waals insulator. These findings establish dielectric anisotropy and excitonic dipole engineering as powerful design principles for compact ultrabroadband polarization-sensitive photodetectors and multifunctional van der Waals photonic systems.
Comments16 pages, 5 figures
