Fig. 1: Second Harmonic Generation (SHG) measurement of MoS2.
From: Quantifying the in-plane strain influence on second harmonic generation of molybdenum disulfide
a Micrograph of MoS2 flakes on PET substrate (The purple dashed line outlines the contour of a triangular monolayer MoS2 flake). b Schematic of loading and SHG process. Strip and cross shaped substrates are designed. Their sizes are given in this figure. Cross shaped substrate can realize biaxial loading along the pink arrows. MoS2 flakes are located in the area indicated by the gray square in the middle of the substrates. The red and green wave lines indicate the incident laser (ω) and emitted SHG signal (2ω), respectively. c SHG peak under different polarization angles. The SHG peak position is at 532 nm. As the polarization angle ϕ varies from 0° to 50°, the intensity of the SHG peak first increases and then decreases. The color sequences of the peak lines in order of different ϕ are dark yellow (0°), light blue (10°), green (20°), black (30°), red (40°) and blue (50°), respectively.
