Probing topological states and their robustness in two-dimensional photonic crystals

Ewold Verhagen

doi:10.1117/12.2632855

3 October 2022 Probing topological states and their robustness in two-dimensional photonic crystals

Ewold Verhagen

Proceedings Volume PC12196, Active Photonic Platforms 2022; PC121960R (2022) https://doi.org/10.1117/12.2632855
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States

Abstract

In topological photonic crystals, suitable crystal symmetries bring the concepts of topological insulators to nanoscale photonic components. We experimentally probe topological states in nanophotonic cavities and waveguides, and investigate to what extent light confinement, transport, and light-matter interactions can benefit from robustness offered by topological design paradigms. We show how the signatures of topological band structures are imprinted on the complex near and far fields of photonic crystal states, and how these can be used to control near-to-far field coupling. Using near-field investigation, we quantify the scattering of topological edge states at sharp corners and controlled disorder. Finally, we show that spin-orbit coupling in the near field of topological photonic crystals can become disconnected from the edge state pseudospin, important to the design of chiral light-matter interfaces.

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Ewold Verhagen "Probing topological states and their robustness in two-dimensional photonic crystals", Proc. SPIE PC12196, Active Photonic Platforms 2022, PC121960R (3 October 2022); https://doi.org/10.1117/12.2632855

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KEYWORDS

Photonic crystals

Near field

Photonic crystal devices

Crystals

Dielectrics

Light-matter interactions

Nanophotonics

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