Topologically enhanced giant broadband second-harmonic generation in Weyl semiconductor tellurium.

ABSTRACT: Achieving strong nonlinear optical (NLO) responses in atomically thin layered materials is essential for advanced nanoscale photonic and on-chip integrated optoelectronic technologies. However, most materials with large second-order susceptibility ( χ(2) ) operate only over narrow wavelength ranges, with rare reports in the mid-infrared (MIR) region. Topological engineering provides a promising strategy to enhance NLO responses. Here, we demonstrate that Weyl semiconductor tellurium (Te) nanoflakes exhibit giant second harmonic generation (SHG) across an ultrabroadband infrared range (1.2-5.0 μm), including the challenging MIR region, achieving conversion efficiency two orders of magnitude greater than GaSe. The extracted χ(2) spectrum reveals a prominent peak of 5.0 ± 0.4 nm V^-1

SUBMITTER: Liang D 

PROVIDER: S-EPMC12644508 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature