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year 27, Issue 2 (ICOP & ICPET 2021 2021)
ICOP & ICPET _ INPC _ ICOFS 2021, 27(2): 216-219 |
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Bazouband E, Hashemi M, Bazouband F. Focusing improvement and depth of focus investigation of a dielectric Metalens with cross-shaped metaatoms. ICOP & ICPET _ INPC _ ICOFS 2021; 27 (2) :216-219
URL: http://opsi.ir/article-1-2344-en.html
URL: http://opsi.ir/article-1-2344-en.html
1- Department of Physics, College of Science, Fasa University, Fasa 74617-81189, Iran, Pars Especial Economic Zone University of Applied Science, Asaluye, Iran
2- Department of Physics, College of Science, Fasa University, Fasa 74617-81189, Iran
2- Department of Physics, College of Science, Fasa University, Fasa 74617-81189, Iran
Abstract: (805 Views)
Considering the wide range applications of small metasurfaces in light focusing, in this paper effect of the included number of metaatoms and consequently metalens’s diameter on the focusing quality is considered. The results indicate that the number of metaatoms cannot be less than that is required to focus the incident light in a suitable place with an acceptable intensity. Metaatoms that are used in our proposed metalens in this paper are silicon cross-shaped on a silica substrate that provide a complete phase coverage between 0 to 2π. Simulation results show that for the designed metalens with focal length of 15 λ, the least numerical aperture value of 0.68 is required to have an acceptable quality of the focal spot. Using the required number of metaatoms, effect of the focal length on the focal depth is also studied. It is observed that for larger focal lengths, the focal depth will be longer.
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