Analysis of tapered nanopillars for reflective metalens: the role of higher-order modes
KAUST DepartmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Electrical Engineering Program
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Online Publication Date2020-07-07
Print Publication Date2020-08
Permanent link to this recordhttp://hdl.handle.net/10754/664082
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AbstractDespite the widespread interest in the metalens technology, few works show the errors during fabrication and analyze how they influence the focusing performance. In this work, we proposed a reflective metalens design and carry out a fundamental study on how a mild tapering angle (<6) of the nanopillars would influence the performance of a reflective metalens. By analyzing the interaction of Mie resonance in the lateral direction and Fabry-Prot resonance in the longitudinal direction using numerical simulations, we reveal the detrimental role the tapering angle plays due to the low transmission near the resonance. We observe the weakening of the electric quadrupole and magnetic dipole response, and the increase of the electric dipole response for tapered nanopillars. Moreover, the Fabry-Prot resonance is disturbed due to the broken symmetry. These factors contribute to lower Q factor resonance and hence the low transmission. The results presented in this work can guide the analysis of fabrication errors and provide insights on how to compensate them.
CitationLin, R., Alnakhli, Z., AlQatari, F., & Li, X. (2020). Analysis of Tapered Nanopillars for Reflective Metalens: The Role of Higher-Order Modes. IEEE Photonics Journal, 12(4), 1–7. doi:10.1109/jphot.2020.3007489
SponsorsThe authors would like to acknowledge the support of KAUST Baseline Fund BAS/1/1664-01-01, and Competitive Research Grants URF/1/3437-01-01 and URF/1/3771-01-01
JournalIEEE Photonics Journal
Except where otherwise noted, this item's license is described as This is an open access article licensed under a Creative Commons Attribution 4.0 License.