Single-defect mode lasing in a non-Hermitian 1D trivial SSH lattice

TL;DR

This paper reports robust single-mode lasing in a non-Hermitian 1D trivial SSH lattice with lower threshold power, achieved by pumping only the defect, enabling lasing at any lattice point.

Contribution

It introduces a non-Hermitian trivial SSH lattice with defect-induced single-mode lasing, demonstrating lower thresholds and flexible lasing locations compared to prior edge-only lasing systems.

Findings

Lower lasing threshold compared to non-defective lattice

Lasing can occur at any point within the lattice

Pumping only the defect ring suffices for lasing

Abstract

We demonstrate robust single-mode lasing in a non-Hermitian 1D trivial Su-Schrieffer-Heeger defective lattice. This structure exhibits a significantly lower threshold power compared to the non-defective lattice, with single-mode lasing sustained across a wide range of pump powers. Notably, our proposed device requires pumping of only the defect ring, leading to minimal required pump power. Moreover, lasing is not confined to the edges but can occur at any point within the lattice.