Strong nonlinear optical response of most thin layered materials is often narrowband, especially in the mid-infrared spectral range. Here, authors experimentally observe second harmonic generation in the range of 1.2-5.0 μm from Weyl semiconductor tellurium nanoflakes. The generation efficiency is shown to be two orders of magnitude larger than that of GaSe.
- Delang Liang
- Mingyang Qin
- Dong Sun
