Measurement of complex refractive index of graphene in infrared bands by reflection spectra

Kai Li; Xuanyu Wang; Zeqian Wu; Wenjie Dong; Yueyue Sun

doi:10.1117/12.2585754

12 March 2021 Measurement of complex refractive index of graphene in infrared bands by reflection spectra

Kai Li, Xuanyu Wang, Zeqian Wu, Wenjie Dong, Yueyue Sun

Proceedings Volume 11763, Seventh Symposium on Novel Photoelectronic Detection Technology and Applications; 117630I (2021) https://doi.org/10.1117/12.2585754
Event: Seventh Symposium on Novel Photoelectronic Detection Technology and Application 2020, 2020, Kunming, China

Abstract

Graphene is a new type of infrared interference carbon Nano-material. The complex refractive index is an important parameter to study its extinction performance. The reflection spectra in 2.5 to 25 m wavebands of graphene pellets were measured by Fourier infrared spectrometer, and the complex refractive index was calculated by Kramers-Kronig ( K-K) relation, and calculation deviations were analyzed. The calculation results show that the real part of complex refractive index is 3.5 to 4.9 and the imaginary part is 0.3 to 2. The results of error analysis indicate that, the difference between the measured reflectivities of 22 degrees angle of incidence and the reflectivities of normal incidence is 10^-4 , the oblique incidence can be used to represent the normal incidence condition, and the different extrapolation of the reflectivities outside the test wavebands have little effect on the results. The data of complex refractive index has some reference value for the study of the infrared extinction characteristics of graphene.

Citation Download Citation

Kai Li, Xuanyu Wang, Zeqian Wu, Wenjie Dong, and Yueyue Sun "Measurement of complex refractive index of graphene in infrared bands by reflection spectra", Proc. SPIE 11763, Seventh Symposium on Novel Photoelectronic Detection Technology and Applications, 117630I (12 March 2021); https://doi.org/10.1117/12.2585754

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