Fig. 1. The HTEM of graphene

Fig. 2. Ellipsometric parameter with incident angle of 70°

Fig. 3. Complex refractive index of graphene pellet

Fig. 4. The SEM of graphene pellet

Fig. 5. Relationship between efficiency factor, extinction coefficient and wavelength

Fig. 6. Relationship between efficiency factor and diameter of round graphene sheet

Fig. 7. Relationship between extinction coefficient and diameter of round graphene sheet

Fig. 8. Relationship between efficiency factor and thickness of round graphene sheet

Fig. 9. Relationship between extinction coefficient and thickness of round graphene sheet