Strong optical anisotropy is commonly achieved by complex engineered materials. Here, authors synthesize elemental crystals of type-II red phosphorus made of wavy tubular structures, exhibiting strong birefringence in the visible and near-infrared spectral region. They demonstrate anisotropic photoluminescence, Raman scattering and second-harmonic generation.
- Shuai Zhang
- Zhaolong Liu
- Jiahong Wang