Q-factor enhancement in all-dielectric anisotropic nanoresonators

Abstract

It is proposed and demonstrated that Q-factor of optical resonators can be significantly enhanced by introducing an extra anisotropic cladding. We study the optical resonances of all-dielectric core-shell nanoresonators and reveal that radially anisotropic claddings can be employed to squeeze more energy into the core area, leading to stronger light confinement and thus significant Q-factor enhancement. We further show that the required homogenous claddings of unusual anisotropy parameters can be realized through all-dielectric multi-layered isotropic structures, which offers realistic extra flexibilities of resonance manipulations for optical resonators.

20 pages, 5 figures and Comments Welcomed

References in corpus (7)

• Two-Dimensional Material Nanophotonics
• Linear and nonlinear optical spectroscopy of a strongly-coupled microdisk-quantum dot system
• Transparent subdiffraction optics: nanoscale light confinement without metal
• Invisible nanowires with interfering electric and toroidal dipoles
• Tunable deep-subwavelength superscattering using graphene monolayers
• Photonic skin-depth engineering
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• Q-factor and absorption enhancement for plasmonic anisotropic nanoparticles