Topological concepts have been demonstrated in microwave photonic systems but laser-written waveguides show the way to topological physics for light at optical frequencies.
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Khanikaev, A. Come to light. Nature Phys 13, 532–533 (2017). https://doi.org/10.1038/nphys4123
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DOI: https://doi.org/10.1038/nphys4123
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