Local optical absorption spectra of MoS2 monolayers obtained using scanning near-field optical microscopy measurements

We obtained local optical absorption spectra of MoS2 with a spatial resolution of approximately 200 nm using scanning near-field optical microscopy with a supercontinuum laser light source, and we found that the absorption spectra exhibited a significant site dependence on the MoS2 monolayer crystal...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2016-03, Vol.55 (3)
Main Authors: Nozaki, Junji, Mori, Shohei, Miyata, Yasumitsu, Maniwa, Yutaka, Yanagi, Kazuhiro
Format: Article
Language:English
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Summary:We obtained local optical absorption spectra of MoS2 with a spatial resolution of approximately 200 nm using scanning near-field optical microscopy with a supercontinuum laser light source, and we found that the absorption spectra exhibited a significant site dependence on the MoS2 monolayer crystal. We found clear relationships between local optical absorption spectra and photoluminescence intensities. At a site that exhibited a weak photoluminescence, the intensity of the A exciton optical absorption was also weak, and its line shape was significantly deformed, which suggests the influence of n-doping. The results indicate a significant inhomogeneity in the n-doping levels on a single sheet.
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.55.038003