Ferroelectric Reconfigurable Homojunction Miniaturized Computational Spectrometers for Dynamic Spectral Sensing

Abstract Miniaturized spectrometers are crucial for advancing compact, energy‐efficient, and real‐time spectral sensing systems. However, traditional spectrometer architectures are limited by mechanical components and efficiency, making it difficult to consistently shrink their size. Here, we report a miniaturized computational spectral sensing platform based on a ferroelectrically reconfigurable WSe 2 homojunction, achieving both high‐resolution spectral reconstruction and dynamic spectral sensing. The device operates under a non‐volatile, near‐zero‐power standby mode enabled by the retention property of ferroelectric polarization, ensuring energy‐efficient monitoring without a continuous power supply. Event‐driven triggers combined with computational reconstruction enable real‐time spectral tracking with ∼32 µs response latency. This system shows broad spectral sensitivity (450 nm–950 nm) and the capability to detect dynamic spectral variations, validated via monitoring reflectance spectra of VO 2 film during phase transitions. This work reveals great potential for low‐power, real‐time spectral sensing, paving the way for on‐site spectral analysis.