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Chin. Phys. B, 2021, Vol. 30(9): 097807    DOI: 10.1088/1674-1056/ac1f06
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Signal-to-noise ratio of Raman signal measured by multichannel detectors

Xue-Lu Liu(刘雪璐)1, Yu-Chen Leng(冷宇辰)1,2, Miao-Ling Lin(林妙玲)1, Xin Cong(从鑫)1,2, and Ping-Heng Tan(谭平恒)1,2,†
1 State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;
2 Center of Materials Science and Optoelectronics Engineering&CAS Center of Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100049, China
Abstract  Raman spectroscopy has been widely used to characterize the physical properties of two-dimensional materials (2DMs). The signal-to-noise ratio (SNR or S/N ratio) of Raman signal usually serves as an important indicator to evaluate the instrumental performance rather than Raman intensity itself. Multichannel detectors with outstanding sensitivity, rapid acquisition speed and low noise level have been widely equipped in Raman instruments for the measurement of Raman signal. In this mini-review, we first introduce the recent advances of Raman spectroscopy of 2DMs. Then we take the most commonly used CCD detector and IGA array detector as examples to overview the various noise sources in Raman measurements and analyze their potential influences on SNR of Raman signal in experiments. This overview can contribute to a better understanding on the SNR of Raman signal and the performance of multichannel detector for numerous researchers and instrumental design for industry, as well as offer practical strategies for improving spectral quality in routine measurement.
Keywords:  multichannel detectors      signal-to-noise ratio      dark noise      shot noise  
Received:  08 June 2021      Revised:  01 August 2021      Accepted manuscript online:  19 August 2021
PACS:  78.30.-j (Infrared and Raman spectra)  
  43.50.Yw (Instrumentation and techniques for noise measurement and analysis)  
  85.60.Gz (Photodetectors (including infrared and CCD detectors))  
  43.60.Cg (Statistical properties of signals and noise)  
Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2016YFA0301204), the National Natural Science Foundation of China (Grant No. 11874350), and Key Research Program of the Chinese Academy of Sciences (Grant Nos. XDPB22 and ZDBS-LY-SLH004).
Corresponding Authors:  Ping-Heng Tan     E-mail:  phtan@semi.ac.cn

Cite this article: 

Xue-Lu Liu(刘雪璐), Yu-Chen Leng(冷宇辰), Miao-Ling Lin(林妙玲), Xin Cong(从鑫), and Ping-Heng Tan(谭平恒) Signal-to-noise ratio of Raman signal measured by multichannel detectors 2021 Chin. Phys. B 30 097807

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