Figure 2.

(A) Infrared thermographic maps of ink solution in the centrifuge tube upon NIR laser irradiation for 0–5 min. (B) Temperature increase for the different HMP concentrations upon laser irradiation at 808 nm and 1 W/cm² for 5 min. (C) UV−Vis−NIR absorbance spectrum of an HMP solution. (D) Temperature profile of an HMP solution at 100 mg/mL upon heating when the laser is on and subsequent cooling once the laser is turned off. (E) Temperature variation of an HMP solution at 100 mg/mL under cyclic laser irradiation during which the laser is on for 20 min in each cycle. (F) Calculation of the time constant for the heat transfer using a linear regression of the cooling profile.