Angle-Independent Broadband Miniaturized Spectrometers

Abstract The miniaturized spectrometers are small and lightweight, which allows for integration into portable analytical instruments and consumer electronics, making them ideal for a wide range of applications, including scientific research, industrial process control, environmental monitoring, and healthcare diagnostics. Compared to other types of grating-based or Fourier-transform spectrometers, filter-based miniaturized spectrometers are relatively simple in design and often more cost-effective to manufacture. However, the spectral accuracy of conventional filter-based miniaturized spectrometers is sensitive to incident light angle. Besides, a large number of filters are required for broadband spectral detection in filter-based spectrometers, which increases cost and complexity. Here, we propose an angle-independent broadband miniaturized spectrometer, where the linear variable Fabry-Perot cavity is introduced to maintain spectral performance over a wide spectral range, and a slit combined with a diffuser is adapted to minimize the sensitivity of spectral accuracy to incident light angle. Our study defines a unique pathway to high-performance miniaturized spectrometers and makes them valuable tools for a wide range of applications requiring compact, cost-effective, and high-performance spectral analysis.