Miniaturized on-chip spectrometers with small footprints, lightweight, and low cost are in great demand for portable optical sensing, lab-on-chip systems, and so on. Such miniaturized spectrometers are usually based on engineered spectral response units and then reconstruct unknown spectra with algorithms. However, due to the limited footprints of computational on-chip spectrometers, the recovered spectral resolution is limited by the number of integrated spectral response units/filters. Thus, it is challenging to improve the spectral resolution without increasing the number of used filters. Here we present a computational on-chip spectrometer using electrochromic filter-based computational spectral units that can be electrochemically modulated to increase the efficient sampling number for higher spectral resolution. These filters are directly integrated on top of the photodetector pixels, and the spectral modulation of the filters results from redox reactions during the dual injection of ions and electrons into the electrochromic material. We experimentally demonstrate that the spectral resolution of the proposed spectrometer can be effectively improved as the number of applied voltages increases. The average difference of the peak wavelengths between the reconstructed and the reference spectra decreases from 1.61 nm to 0.29 nm. We also demonstrate the proposed spectrometer can be worked with only four or two filter units, assisted by electrochromic modulation. In addition, we also demonstrate that the electrochromic filter can be easily adapted for hyperspectral imaging, due to its uniform transparency. This strategy suggests a new way to enhance the performance of miniaturized spectrometers with tunable spectral filters for high resolution, low-cost, and portable spectral sensing, and would also inspire the exploration of other stimulus responses such as photochromic and force-chromic, etc, on computational spectrometers.

便携式光学传感、片上实验室系统等对占地面积小、重量轻、成本低的小型化片上光谱仪有很大的需求。这种小型化光谱仪通常基于工程光谱响应单元，然后通过算法重建未知光谱。然而，由于计算片上光谱仪的占地面积有限，恢复的光谱分辨率受到集成光谱响应单元/滤波器的数量的限制。因此，在不增加所用滤光片数量的情况下提高光谱分辨率具有挑战性。在这里，我们提出了一种计算片上光谱仪，使用基于电致变色滤波器的计算光谱单元，可以通过电化学调制来增加有效采样数量，以获得更高的光谱分辨率。这些滤光片直接集成在光电探测器像素的顶部，滤光片的光谱调制是离子和电子双重注入电致变色材料期间发生氧化还原反应的结果。我们通过实验证明，随着施加电压数量的增加，所提出的光谱仪的光谱分辨率可以有效提高。重建光谱和参考光谱之间峰值波长的平均差异从 1.61 nm 减小到 0.29 nm。我们还证明了所提出的光谱仪可以仅使用四个或两个滤光片单元，并辅以电致变色调制。此外，我们还证明，由于电致变色滤光片具有均匀的透明度，因此可以轻松适用于高光谱成像。 该策略提出了一种新的方法来增强具有可调谐光谱滤波器的小型光谱仪的性能，以实现高分辨率、低成本和便携式光谱传感，并且还将激发对其他刺激响应的探索，例如光致变色和力致变色等。在计算光谱仪上。