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Lasing at topological edge states in a photonic crystal L3 nanocavity dimer array 被引量:6

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摘要 Topological photonics have provided new insights for the manipulation of light.Analogous to electrons in topological insulators,photons travelling through the surface of a topological photonic structure or the interface of two photonic structures with different topological phases are free from backscattering caused by structural imperfections or disorder.This exotic nature of the topological edge state(TES)is truly beneficial for nanophotonic devices that suffer from structural irregularities generated during device fabrication.Although various topological states and device concepts have been demonstrated in photonic systems,lasers based on a topological photonic crystal(PhC)cavity array with a wavelength-scale modal volume have not been explored.We investigated TESs in a PhC nanocavity array in the Su–Schrieffer–Heeger model.Upon optical excitation,the topological PhC cavity array realised using an InPbased multiple-quantum-well epilayer spontaneously exhibits lasing peaks at the topological edge and bulk states.TES characteristics,including the modal robustness caused by immunity to scattering,are confirmed from the emission spectra and near-field imaging and by theoretical simulations and calculations.
出处 《Light(Science & Applications)》 SCIE EI CAS CSCD 2019年第1期841-850,共10页 光(科学与应用)(英文版)
基金 supported by the Samsung Research Funding Centre of Samsung Electronics under Project Number SRFC-MA1801-02 the National Research Foundation(NRF)grant funded by the Korea Government(Ministry of Education,Science and Technology)(no.2014R1A2A1A11051576).
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