Ultrafast Science / 2021 / Article / Fig 3

Research Article

Polarization Flipping of Even-Order Harmonics in Monolayer Transition-Metal Dichalcogenides

Figure 3

HHG polarization scans of the 13th (solid circles) and 14th (open circles) harmonics from WS2 taken at (a) 0°, (b) , and (c) 0°. When the MIR laser polarization (orange arrows) is perpendicular to the crystal mirror plane (i.e., (a, c)), the odd-order harmonics are polarized parallel and the even-order harmonics are polarized perpendicular with respect to the driving MIR field. In the case of the parallel excitation (i.e., (b)), the odd- and even-order harmonics are polarized parallel to the driving MIR field.