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What is the size range of metamolecules?

What is the size range of metamolecules? Correct Answer λ0/6 – λ0/2

In general, the typical size range of metamolecules lies between λ0/6 to λ0/2, which may slightly decrease by a factor of 1.5 to 2 owing to the high refractive index dielectric substances. The precise shape, size, geometry, orientation and arrangement of these materials give them their peculiar properties.

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