Laterally emitted surface second harmonic generation in a single ZnTe nanowire

TL;DR

This paper demonstrates the observation of highly directional surface second harmonic generation in a single ZnTe nanowire, highlighting its potential for advanced nanophotonic applications.

Contribution

It reports the first direct observation of lateral surface SHG in a single ZnTe nanowire with high efficiency and unique emission characteristics.

Findings

Surface SHG signal is highly directional and polarized perpendicular to the nanowire axis.

Two strong SHG peaks observed on nanowire surfaces, confirmed by FDTD simulations.

Surface SHG in ZnTe nanowire shows high conversion efficiency and potential for photonic devices.

Abstract

We report a direct observation on the unique laterally emitted surface second harmonic generation (SHG) in a single ZnTe nanowire. The highly directional surface SHG signal that polarizes along the direction vertical to the nanowire growth axis, is significantly larger than the bulk SHG contribution, indicating a high efficiency of surface SHG. Two strong SHG peaks are observed on both sides of the nanowire surfaces in the far-field scanning images, which is further supported by FDTD simulations, demonstrating that the unique laterally emitted signal is ascribed to surface SHG in the ZnTe nanowire. The surface SHG in a single ZnTe nanowire with unique lateral emission and high conversion efficiency shows great potential applications in short-wavelength nanolasers, nonlinear microscopy and polarization dependent photonic integrating.