Fig. 3. (Color online) (a) Photograph of TDBC films with different thicknesses on white paper and (b–d) their optical microscopic images in reflection mode. (e) Photograph of the same TDBC films on a white light source and (f–h) their optical microscopic images in transmission mode. All the microscopic images were obtained with the same scale using a 50× objective.
© NPSM
