Structuring Nonlinear Wavefront Emitted from Monolayer Transition-Metal Dichalcogenides
(a) Experimentally measured propagation of an emitted SH signal along the -axis under a LP excitation (polarized along the -axis). The inset shows the phase distribution of the SH signals, analog to a typical photonic spin-Hall metasurface along the -axis. The inset images captured along different positions of the -axis present the emitted SH spots. (b–d) Measured RCP components from three samples with different deflected angles of 5°, 10° and 15°, respectively. (e–g) The numerical simulated results corresponded with the experimental results in Figures 4(b)–4(d), respectively. (h) Schematic of the versatile control of the polarization of the deflected LP beams. (i–k) Polarimetric plots of SHG intensity from samples with phase differences of , 0.25λ, and 0.5λ, respectively.