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Topological Diffraction from Grating with Space Variant Chirality
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DOI：10.1021/acsphotonics.2c00152.png)
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Light-matter interactions in a chiral structure can induce strong polarization selectivity. Specifically, an optical activity in a form of polarization rotation and a circular dichroism may be controlled by the mirror symmetry breaking of the unit-cell geometry. We design and experimentally investigate plasmonic metasurfaces with a spatially varying chiral geometry and demonstrate how this architecture may lead to a geometric Berry phase. Our designed structure produces a polarizationdependent diffraction of nearly linear states. We experimentally examine the diffraction orders and show that they are topological in nature. Moreover, the influence of various geometrical factors is also investigated.
Keyword:
nanophotonics
surface plasmons
metasurfaces
topological photonics
photonic crystal
geometric phases
期刊
IF:
6.7
论文数:
5.6K
被引数:
2.5W
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