Theoretical Criteria for Scattering Dark States in
Nanostructured Particles
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Abstract
Nanostructures with multiple resonances
can exhibit a suppressed
or even completely eliminated scattering of light, called a scattering
dark state. We describe this phenomenon with a general treatment of
light scattering from a multiresonant nanostructure that is spherical
or nonspherical but subwavelength in size. With multiple resonances
in the same channel (i.e., same angular momentum and polarization),
coherent interference always leads to scattering dark states in the
low-absorption limit, regardless of the system details. The coupling
between resonances is inevitable and can be interpreted as arising
from far-field or near-field. This is a realization of coupled-resonator-induced
transparency in the context of light scattering, which is related
to but different from Fano resonances. Explicit examples are given
to illustrate these concepts