Robust optical delay lines via topological protection

Details Robust optical delay lines via topological protection Robust optical delay lines via topological protection

2011-02-16

arxiv.org/abs/1102.3256v1

Nature Physics 7, 907--912 (2011)

Physics

Quantum Physics

9 pages, 5 figures + 12 pages of supplementary information

Scientific paper

10.1038/nphys2063

Phenomena associated with topological properties of physical systems are naturally robust against perturbations. This robustness is exemplified by quantized conductance and edge state transport in the quantum Hall and quantum spin Hall effects. Here we show how exploiting topological properties of optical systems can be used to implement robust photonic devices. We demonstrate how quantum spin Hall Hamiltonians can be created with linear optical elements using a network of coupled resonator optical waveguides (CROW) in two dimensions. We find that key features of quantum Hall systems, including the characteristic Hofstadter butterfly and robust edge state transport, can be obtained in such systems. As a specific application, we show that the topological protection can be used to dramatically improve the performance of optical delay lines and to overcome limitations related to disorder in photonic technologies.

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