Resonant optical phenomena in metals and dielectrics have profound applications in many fields. The nanoscale confinement allows for unpreceded control of light-matter interaction at surfaces and interfaces, manipulating and controlling the light flow. Resonant phenomena are usually associated with radiative and intrinsic loss channels, which are detrimental in many systems. Metals show strong intrinsic losses. Thus, dielectric systems have recently become the focus of attention as they promise lower loss, higher degrees of flexibility with respect to tuning the interplay of different resonances, and fabrication strategies closer to industrial standards.
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Source: Phys.org