Figure 4
From: Terahertz emission from gold nanorods irradiated by ultrashort laser pulses of different wavelengths
Reflection geometry, excitation at different wavelengths. (a) Time-domain waveforms for the peak optical intensity of 40 GW/cm2. (b) Terahertz pulse energy as a function of the peak optical intensity. The dashed lines and numbers near them indicate the power laws and their orders, respectively. The solid lines are fitting with Eq. (1). Values of the enhancement factor η are shown in legend. (c) Parameter γ as a function of the peak optical intensity. Inset: schematic of the experiment.
