Dynamic Cavities Driven Reconfigurable Infrared Photonics: VO 2 ‐Integrated Dual‐Mode Switching and Spectral Engineering

The evolution of infrared photonic technologies has undergone revolutionary advancements in recent decades, demonstrating exceptional practical utility across diverse application scenarios. Nevertheless, conventional optical architectures suffer from intrinsic limitations due to their static structural configurations, which significantly constrain their adaptability in complex operational environments. Among the critical challenges, the dynamic manipulation of optical switching and frequency selection within the infrared spectrum remains heavily reliant on the integration of reconfigurable materials. Here, a novel approach we presented by incorporating vanadium dioxide (VO 2 ) thin films into Fabry Perot resonators, utilizing its metal insulator transition (MIT) characteristics to synergistically achieve dual‐mode dynamic switching (reflection modulation) and broadband infrared spectroscopy engineering (3.5–5.6 μm absorption tuning). The functional design of these VO 2 based hybrid devices paves the way for the application of small volume multifunctional integrated real time spectral tuning, non‐reciprocal routing, and intelligent thermal management scenarios. This breakthrough holds substantial potential for adaptive multiband intelligent windows, intelligent infrared stealth, intelligent radiative cooling, space thermal control, and high‐sensitivity infrared detection.