Strong optical anisotropy in one-dimensional phosphorus wavy tubes.

Area of Science:

• Materials Science
• Solid-State Physics
• Optoelectronics

Background:

• Anisotropic materials with 1D structures are crucial for polarization-sensitive optoelectronics.
• Discovering elemental crystals with intrinsic 1D order and giant optical anisotropy is challenging.

Purpose of the Study:

• To synthesize and characterize a novel 1D phosphorus single crystal.
• To investigate its optical properties and potential for optoelectronic applications.

Main Methods:

• Single-crystal X-ray diffraction
• Advanced transmission electron microscopy
• Optical spectroscopy (photoluminescence, Raman scattering)
• Nonlinear optical measurements (second-harmonic generation)

Main Results:

• Synthesis of a direct-bandgap semiconducting 1D phosphorus crystal with wavy polygonal tubes.
• Monoclinic lattice structure confirmed.
• Giant birefringence observed in the visible and near-infrared regions.
• Remarkable linear and nonlinear optical anisotropies demonstrated.

Conclusions:

• The synthesized phosphorus crystal offers a new platform for giant optical anisotropy.
• Its unique structure enables orientation-dependent optical phenomena.
• Potential applications in on-chip polarization devices and nonlinear photonic circuits.