Figure 4. Optical and surface characterizations of the nanolens array.

(a), Transmittance versus wavelength of the nanolens array. The initial, deformed, and recovered nanostructures are compared in terms of transmittance. It turns out that the nanolens array is optically recovered as a result of the absorption of electromagnetic energy. In addition, the numerical simulation result obtained from FDTD is compared with the experimental results. (b), Transmittance versus wavelength of the nanolens array. The transmittance changes according to the angle of the incident light. The transmittance remains nearly at the same level up to 30°inclination. There is a significant difference between the transmittances for the specimens with and without fullerenes due to the electromagnetic wave absorption of fullerenes as shown in the inset. (c), (d), (e), Contact angle variation of the nanolens array ((d) initial, (e) deformed, and (f) recovered states). The contact angle starts with 113°, decreases down to 68°, and returns to 112°.