Journal
OPTICS EXPRESS
Volume 22, Issue 13, Pages 15969-15974Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.015969
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Funding
- National Basic Research Program 973 [2011CB932700, 2011CB932703]
- National Natural Science Fund Project [61335006, 61378073, 61077044]
- Beijing Natural Science Fund Project [4132031]
- Basic Research Fund of Beijing Jiaotong University [2012YJS120]
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Chemical vapor deposition (CVD) method is considered to be an efficient way to prepare Van der Waals heterostructure. However, accurately and hurtlessly identifying the layers number of MoS2 in the heterostructure is still a challenge. Here, we calculated the expected contrast between MoS2/graphene heterostructure and underlying SiO2/Si substrate by using a Fresnel law based model. And we indicated that contrast at blue and green incident light is ideal for visibility and layer number detecting. Our measured value showed good agreement with calculated ones. And Raman spectrum helped to confirm our speculation. (C)2014 Optical Society of America
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