Abstract
Strong electrical dipole resonance (ER) with high quality-factor (Q) (over several thousands) in a simple silicon all-dielectric rod arrays without asymmetric structure is achieved in the near infrared (NIR) wavelength range. According to numerical simulations, strong high order ER is excited by vertical incident plane waves with electric fields polarized perpendicular to the rod instead of parallel. The electric field coupling between adjacent rods is greatly enhanced by increasing the length of the rods, and the radiative loss of the ER is significantly depressed, thus achieving high Q resonances. In the meantime, the electric field enhancement both inside and surrounding the rod are greatly improved, which is conducive to many applications. The proposed all-dielectric metasurface is simple, low loss, Complementary Metal Oxide Semiconductor (CMOS) compatible, and can be applied in many fields, such as sensing, narrowband filters, optical modulations, and nonlinear interactions.
Highlights
High quality-factor (Q) resonance in metamaterials or metasurfaces is desirable for various applications of ultra-high sensitive sensing, narrowband filtering, modulation and nonlinear interactions [1,2,3,4,5,6,7]
Metasurfaces with a symmetry broken structure can effectively reduce the radiative loss of Fano resonance, the Q factor achieved is limited to the order of 100, and the resonance is very weak even in the lower THz regime where the ohmic loss can be negligible [8,9,10,11,12,13,14,15,16,17]
We have numerically demonstrated that strong electrical resonance (ER) with high Q value over field coupling between is greatly enhanced by rod increasing the length of thestructure
Summary
High quality-factor (Q) resonance in metamaterials or metasurfaces is desirable for various applications of ultra-high sensitive sensing, narrowband filtering, modulation and nonlinear interactions [1,2,3,4,5,6,7]. Strong either inside the dielectric metasurfaces consisting of asymmetric rods and rings [5,6,35,36,37], and experimentally reachable of [7,38]. High Q resonance can be expected in a simple rod arrays with dielectric resonators or in SRR gaps accompany with high Q, which is useful for nonlinear high permittivity. Can be achieved in a simple all-dielectric silicon rod arrays without asymmetric structure. We have numerically demonstrated that strong ER with high Q value over field coupling between is greatly enhanced by rod increasing the length of thestructure. Rods, the thousands can beadjacent achieved rods in a simple all-dielectric silicon arrays without asymmetric radiativeThe losselectric of thefield. The electric field enhancement both inside and surrounding rod is greatly improved
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