Fig. 4: Transmitted SHG response of 1L MoS2/PZT interface.
From: Polar coupling enabled nonlinear optical filtering at MoS2/ferroelectric heterointerfaces
a–c SHG mapping in transmission mode of the same MoS2/PZT sample shown in Fig. 2 taken with no analyzer applied (a, c) and with a horizontal analyzer applied (b). The red solid (yellow open) arrows mark the incident light (analyzer) polarization. The crystalline orientations of PZT and MoS2 are shown as insets in a. The scale bars are 2 μm. All images were taken at the excitation laser power of 20 mW. d Normalized SHG intensity profiles obtained in the transmission (T-SHG) and reflection (R-SHG) modes along the black dotted line in a. The dashed lines serve as the guide to the eye. e Averaged SHG intensity as a function of PZT thickness taken on the Pup (squares) and Pdown (triangles) domains in both reflection (open symbols) and transmission (solid symbols) modes at excitation laser power of 20 mW.
