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Helicity-Preserving Optical Metafluids
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DOI：10.1021/acs.nanolett.3c01026.png)
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A colloidal suspension of photonic nanostructures exhibitingopticalmagnetism is dubbed an optical metafluid. A promising constituentof a metafluid is a nanosphere of high-refractive index dielectricshaving the magnetic-type Mie resonances in the optical frequency.At the Kerker conditions, a dielectric nanosphere satisfies the electromagneticduality symmetry condition and preserves the handedness of circularlypolarized incident light. A metafluid of such dielectric nanospheresthus preserves the helicity of incident light. In the helicity-preservingmetafluid, the local chiral fields around the constituent nanospheresare strongly enhanced, which improves the sensitivity of enantiomer-selectivechiral molecular sensing. Here, we experimentally demonstrate thata solution of crystalline silicon nanospheres can be dualand anti-dual metafluids. We first theoretically addressthe electromagnetic duality symmetry of single silicon nanospheres.We then produce solutions of silicon nanospheres with narrow sizedistributions and experimentally demonstrate the dualand anti-dual behaviors.
Keyword:
nanophotonics
Mie resonance
metamaterials
optical helicity
期刊
IF:
9.1
论文数:
2.7W
被引数:
16.5W
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