Nonhermitian defect states form at an interface in a coupled-resonator chain when the mode pair's lifetimes split but their frequencies stay aligned, as realized by nanoparticle perturbations on symmetric microresonators.
Electrically Tunable and Reconfigurable Topological Edge State Lasers
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abstract
We report an actively tunable topological edge mode laser in a one-dimensional Su-Schrieffer-Heeger (SSH) laser chain, where the SSH chain is realized in an electrically-injected Fabry-Perot (FP) laser chain. A non-Hermitian SSH model is developed to investigate the SSH laser chain with tunable active topological defect. We theoretically demonstrate topological edge mode phase transition in the SSH laser chain. The phase transition manifested in the tight binding SSH laser chain is observed experimentally and agreed well with the theoretical predictions. Finally, by electronically tuning the gain and loss, a lossy topological mode is obtained, and lasing is experimentally observed in the lossy time-reversal configuration. This work presents a versatile platform to investigate novel concepts, such as topological mode, for main stream photonic applications.
fields
physics.optics 1years
2019 1verdicts
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Nonhermitian defect states from lifetime differences
Nonhermitian defect states form at an interface in a coupled-resonator chain when the mode pair's lifetimes split but their frequencies stay aligned, as realized by nanoparticle perturbations on symmetric microresonators.