| Abstract: | Resonances can be tuned in dielectric resonators in order to construct
single-resonator, negative-index metamaterials. For example,
high-contrast inclusions in the form of metallic dipoles can be used to
shift the first electric resonance down (in frequency) to the first
magnetic resonance, or alternatively, air splits can be used to shift the
first magnetic resonance up (in frequency) near the first electric
resonance. Degenerate dielectric designs become especially useful in
infrared- or visible-frequency applications where the resonator sizes
associated with the lack of high-permittivity materials can become of
sufficient size to enable propagation of higher-order lattice modes in
the resulting medium. |