A novel near-infrared metalens using type I hyperbolic metamaterial

Mohamed J. Kyamo; Brian A. Lail

doi:10.1117/12.2519154

13 May 2019 A novel near-infrared metalens using type I hyperbolic metamaterial

Mohamed J. Kyamo, Brian A. Lail

Proceedings Volume 10980, Image Sensing Technologies: Materials, Devices, Systems, and Applications VI; 109801E (2019) https://doi.org/10.1117/12.2519154
Event: SPIE Defense + Commercial Sensing, 2019, Baltimore, MD, United States

Abstract

Metamaterials, or synthetic materials that have engineered material parameters, have been utilized to demonstrate extraordinary usefulness in the control of electromagnetic waves. In this paper, a novel metalens design in the near infrared band from 1.5μm to 3μm is presented. It consists of a Fresnel zone plate (FZP)-type metasurface which is called a plasmonic waveguide coupler (PWC), situated on a slab of type I hyperbolic metamaterial (HMM) that lies on a silicon substrate which has a silver nanodipole embedded within it. The PWC is made out of rings of Indium Tin Oxide (ITO) and the type I HMM is constructed using a periodic stack of ITO and silicon layers that, through effective medium theory (EMT), act as a slab of type I HMM. Together the PWC and the HMM slab serve to focus incoming radiation onto a focal point marked by the location of the silver (Ag) nanodipole. The Ag nanodipole allows for high subwavelength confinement of optical modes because the in-focal point component of the electromagnetic field vector couples to the plasmonic resonance of the dipole. The maximum achieved resolution is up to 0.01667 λ at an operating wavelength of 1.53 μm and electric field intensity enhancement of 10⁶ is achieved. The enhancement in field is related to the principal localized surface plasmon resonances (LSPRs) around the resonator’s edges on the interface between the Ag nanodipole and the substrate.

Citation Download Citation

Mohamed J. Kyamo and Brian A. Lail "A novel near-infrared metalens using type I hyperbolic metamaterial", Proc. SPIE 10980, Image Sensing Technologies: Materials, Devices, Systems, and Applications VI, 109801E (13 May 2019); https://doi.org/10.1117/12.2519154

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