Figure 2

(a) Optical image measured with a white light on mica nanosheets on a 100 nm SiO₂/Si substrate. (b) Optical image measured with the 530 nm light, which is near the maximal contrast for mica nanosheets. (c) Optical image measured with the 530 nm light on monolayer mica nanosheets. (inset) AFM image taken from the dotted area in (c). (d) Raman spectra of mica nanosheets with different layer numbers. The spectra were taken from the same film as (b). (e) Raman intensity maps monitored with 263-cm⁻¹ mode. (f) Distribution of the layer numbers estimated from 100 Raman mapping images.