Figure 4.

ERS temporal calibration for time-resolved SERS measurements. (A) Schematic illustration of the microscopic environment of the hotspots under laser excitation of low and high powers. (B–C) Time-trajectories of ERS signals at 87 cm⁻¹ and three MRS signals at 1322 cm⁻¹, 1371 cm⁻¹, and 1519 cm⁻¹ (B) without and (C) with dynamic modulations of laser excitation powers. (D) The scatter plots of I_MRS as a function of I_ERS (top) and I₁₃₂₂ (bottom). (E) A matrix of calculated correlation coefficients (CC) among ERS and MRS signals. (F) Time-trajectories of 1371 cm⁻¹ and 1519 cm⁻¹ modes by ERS calibration at 87 cm⁻¹ and the MRS calibration at 1322 cm⁻¹.