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An optics-free spectrometer is demonstrated based on InGaN semiconductor photodiodes. The design is insensitive to the incident angle of light and delivers decent light absorption across the visible spectrum. In combination with compressive sensing algorithms, a high-performance spectrometer suitable for portable applications as well as sensing in harsh environments is shown.
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Juhyeon Kim, Srinivasa Cheekati, Tuba Sarwar, Pei-Cheng Ku, "Optics-free ultrathin-film spectrometers based on GaN light absorbers," Proc. SPIE 11686, Gallium Nitride Materials and Devices XVI, 116862O (5 March 2021); https://doi.org/10.1117/12.2578585