Ultrahigh-resolution spectrometer based on 19 integrated gratings

An Qing Jiang, Kai Yan Zang, Hua Tian Tu, Jian Ke Chen, Wei Jie Lu, Osamu Yoshie, Xiao Ping Wang, Xiao Dong Xiang, Young Pak Lee, Bing Chen, Yu Xiang Zheng, Song You Wang, Hai Bin Zhao, Yue Mei Yang, Liang Yao Chen

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Abstract

Optical spectrometers play a key role in acquiring rich photonic information in both scientific research and a wide variety of applications. In this work, we present a new spectrometer with an ultrahigh resolution of better than 0.012 nm/pixel in the 170–600 nm spectral region using a grating-integrated module that consists of 19 subgratings without any moving parts. By using two-dimensional (2D) backsideilluminated complementary metal-oxide-semiconductor (BSI-CMOS) array detector technology with 2048 × 2048 pixels, a high data acquisition speed of approximately 25 spectra per second is achieved. The physical photon-sensing size of the detector along the one-dimensional wavelength direction is enhanced by a factor of 19 to approximately 428 mm, or 38912 pixels, to satisfy the requirement of seamless connection between two neighboring subspectral regions without any missing wavelengths throughout the entire spectral region. As tested with a mercury lamp, the system has advanced performance capabilities characterized by the highest k parameter reported to date, being approximately 3.58 × 104, where k = (working wavelength region)/(pixel resolution). Data calibration and analysis as well as a method of reducing background noise more efficiently are also discussed. The results presented in this work will stimulate further research on precision spectrometers based on advanced BSI-CMOS array detectors in the future.

Original languageEnglish
Article number10211
JournalScientific reports
Volume9
Issue number1
DOIs
Publication statusPublished - 2019 Dec 1

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    Jiang, A. Q., Zang, K. Y., Tu, H. T., Chen, J. K., Lu, W. J., Yoshie, O., Wang, X. P., Xiang, X. D., Lee, Y. P., Chen, B., Zheng, Y. X., Wang, S. Y., Zhao, H. B., Yang, Y. M., & Chen, L. Y. (2019). Ultrahigh-resolution spectrometer based on 19 integrated gratings. Scientific reports, 9(1), [10211]. https://doi.org/10.1038/s41598-019-46792-7