Xijie Wang, Ziliang Ruan, Gengxin Chen, Shengqi Gong, Zexu Wang, Kaixuan Chen, Liu Liu
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Ultrahigh Resolution Reconstructive Spectrometer Using a Disordered Cavity on Thin-Film Lithium Niobate
Integrated spectrometers offer unique advantages for spectral measurements in portable devices. While reconstructive spectrometers overcome the bandwidth-to-resolution trade-off of traditional designs, they often require complex electrical control or spatial sampling. Here, we propose and demonstrate a speckle-based spectrometer on thin-film lithium niobate, utilizing single-drive logic and a single photodetector. By leveraging the random reflections of a disordered multimode waveguide grating resonant cavity in a spiral waveguide, we achieve an ultrahigh resolution of 1 pm for sparse spectra and a theoretical resolution of 6 pm within a 5 nm spectral range, while maintaining an ultralow power consumption of 7.21 μW and an energy consumption of 0.453 μJ at a scan rate of 10 Hz. Furthermore, we demonstrate high-speed spectral recognition at 100 kHz under a low-voltage drive of ±5 V using a neural network algorithm. This work presents an energy-efficient, high-speed, and ultrahigh-resolution solution for spectral analysis.
期刊介绍:
Published as soon as accepted and summarized in monthly issues, ACS Photonics will publish Research Articles, Letters, Perspectives, and Reviews, to encompass the full scope of published research in this field.