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UV-Visible-NIR Miniaturized Spectrometer Based on InSe/GaN Heterojunction
Yujing Wang1,2, Xin Wang3, Qian Hu1,2
1State Key Laboratory of Semiconductor Physics and Chip Technologies, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, China.
Small (Weinheim an Der Bergstrasse, Germany)
|August 11, 2026
Summary
This study introduces a compact computational spectrometer using an InSe/GaN heterojunction. This miniaturized device reconstructs spectra from 300-960 nm, enabling advanced sensing and imaging applications.
Area of Science:
- Materials Science
- Optoelectronics
- Spectroscopy
Background:
- Miniaturized spectrometers are essential for integrated sensing systems.
- Conventional spectrometers use bulky optical components, limiting device size and integration.
- Computational spectral reconstruction offers a path to miniaturization by removing dispersive elements.
Purpose of the Study:
- To develop a miniaturized single-detector computational spectrometer.
- To achieve broadband spectral sensing and reconstruction in a compact footprint.
- To demonstrate applications in light power density estimation, imaging, and tetrachromatic vision.
Main Methods:
- Fabrication of a mixed-dimensional InSe/GaN heterojunction.
- Utilizing computational spectral reconstruction principles.
- Characterization of spectral sensing across the 300-960 nm range.
Main Results:
- A compact spectrometer (30 × 30 µm²) was achieved.
- Broadband spectral sensing and reconstruction from UV to NIR were demonstrated.
- Quantitative light power density estimation and spectral imaging capabilities were validated.
Conclusions:
- The InSe/GaN heterojunction enables a miniaturized computational spectrometer.
- This technology facilitates compact broadband spectral sensing beyond visible light.
- It opens avenues for advanced integrated sensing and bioinspired vision systems.
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