Lasing at topological edge states in a photonic crystal L3 nanocavity dimer array

Changhyun Han; Myungjae Lee; Ségolène Callard; Christian Seassal; Heonsu Jeon

doi:10.1038/s41377-019-0149-7

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Lasing at topological edge states in a photonic crystal L3 nanocavity dimer array

Article

- Lasing at topological edge states in a photonic crystal L3 nanocavity dimer array
- Light: Science & Applications Vol. 8, Issue 3, Pages: 361-370(2019)
- Affiliations：
  
  1.Department of Physics and Astronomy, Seoul National University, Seoul, 08826, Republic of Korea
  2.Inter-University Semiconductor Research Centre, Seoul National University, Seoul, 08826, Republic of Korea
  3.Université de Lyon, Institut des Nanotechnologies de Lyon-INL, UMR CNRS 5270, CNRS, Ecole Centrale de Lyon, 69134, Ecully, France
  4.Institute of Applied Physics, Seoul National University, Seoul, 08826, Republic of Korea
- Author bio：
  
  Heonsu Jeon (hsjeon@snu.ac.kr)
- Funds：
- DOI：10.1038/s41377-019-0149-7
  CLC：
- Published：2019，
  
  Published Online：24 April 2019，
  
  Received：18 January 2019，
  
  Revised：25 March 2019，
  
  Accepted：26 March 2019
- Accepted：
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Han, C. et al. Lasing at topological edge states in a photonic crystal L3 nanocavity dimer array. Light: Science & Applications, 8, 361-370 (2019).
DOI：

Han, C. et al. Lasing at topological edge states in a photonic crystal L3 nanocavity dimer array. Light: Science & Applications, 8, 361-370 (2019). DOI： 10.1038/s41377-019-0149-7.

摘要

Abstract

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 InP-based 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.

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references

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