Ferroelectric Reconfigurable Homojunction Miniaturized Computational Spectrometers for Dynamic Spectral Sensing

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 WSe₂ 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 VO₂ film during phase transitions. This work reveals great potential for low-power, real-time spectral sensing, paving the way for on-site spectral analysis.