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	Graphene Characterization by Hilbert-Huang Transform-Based Terahertz Spectroscopy
	Liu, Huan1,2; Fan, Ya-Xian1,2; Han, Xu1,2; Lu, Wen-Qiang3; Tao, Zhi-Yong1,2
	2017-11-01
摘要	We demonstrate a contact-less characterization method of monolayer graphene (MG) with all-fiber terahertz time-domain spectroscopy (THz-TDS) based on the Hilbert-Huang transform (HHT). The MG was grown on a Cu foil by chemical vapor deposition and then transferred to the poly (ethylene terephthalate) substrate by polymethyl methacrylate-assisted wet transfer. In our THz-TDS system, the time-domain pulse signal through MG is decomposed into eight components called the intrinsic mode functions (IMFs). It is found that the decomposed low-order modes are related to the original MG signal oscillations, whereas the other high-order modes correspond to the noise. The first IMF component can be used to extract the apparent graphene absorption peak near 0.7 THz, which could be more obvious with superposition of the second IMF due to the increasing spectral amplitude in the lower frequency range. The proposed HHT-based THz-TDS provides a more efficient way for graphene characterization.
关键词	Time domain spectroscopy PET substrate absorption peak time-frequency analysis
DOI	10.1109/LPT.2017.2754513
发表期刊	IEEE PHOTONICS TECHNOLOGY LETTERS
ISSN	1041-1135
卷号	29期号:21页码:1880-1883
通讯作者	Tao, ZY (reprint author), Harbin Engn Univ, Minist Educ China, Key Lab In Fiber Integrated Opt, Harbin 150001, Heilongjiang, Peoples R China. ; Tao, ZY (reprint author), Harbin Engn Univ, Coll Sci, Phys Res Ctr, Harbin 150001, Heilongjiang, Peoples R China.
收录类别	SCI
WOS记录号	WOS:000413028100031
语种	英语