Topological Protection in Radiative Photonic Crystal Cavities
R.T. Barczyk (AMOLF Institute for Atomic and Molecular Physics)
N. Parappurath (AMOLF Institute for Atomic and Molecular Physics)
S. Arora (TU Delft - QN/Kuipers Lab, Kavli institute of nanoscience Delft)
Thomas Bauer (TU Delft - QN/Kuipers Lab, Kavli institute of nanoscience Delft)
L. Kuipers (Kavli institute of nanoscience Delft, TU Delft - QN/Quantum Nanoscience)
E. Verhagen (AMOLF Institute for Atomic and Molecular Physics)
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Abstract
We study the signatures of topological light confinement in the leakage radiation of two-dimensional topological photonic crystal cavities that feature the quantum spin Hall effect at telecom wavelengths. The mode profiles in real and momentum space are retrieved using far field imaging and Fourier spectropolarimetry. We examine the scaling behavior of mode spectra, observe band-inversion-induced confinement, and demonstrate hallmarks of topological protection in the loss rates, which are largely unaffected by cavity shape and size.