High-Order Χ Points Driven Multi-Polarized Emission in a Square Plasmonic Lattice

Abstract

Abstract Multi-polarized light sources are important in applications such as polarization multiplexing signals and polarization imaging. In photonic and plasmonic systems, one way to achieve multi-polarized light sources is via high-symmetry points of the lattices. In this work, we designed a centimeter-scale square lattice of aluminum nanocones array mimics an infinite lattice to facilitate exploration the possibility of multi-polarized beams emission at high-symmetry points. Compared to beam directly diffract on the lattices, after coupling plasmonic lattice with dye gain, four beams of multi-polarized with a symmetric distribution generated at Χ (1) points within an iso-frequency plane. Detailed analysis of far-field emission polarizations and near-field dipole distributions linked to Χ (1) points emissions confirms their origin as the singlet eigenmode B2 at Χ (2) points. This work experimental generated multi-polarized light sources via high-symmetry points of the lattice and identified the mode of amplified spontaneous emissions by using symmetry arguments, which provides new application prospects in polarized imaging and optical communication.