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Proceedings Paper

A novel near-infrared metalens using type I hyperbolic metamaterial
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Paper 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.

Paper Details

Date Published: 13 May 2019
PDF: 6 pages
Proc. SPIE 10980, Image Sensing Technologies: Materials, Devices, Systems, and Applications VI, 109801E (13 May 2019); doi: 10.1117/12.2519154
Show Author Affiliations
Mohamed J. Kyamo, Florida Institute of Technology (United States)
Brian A. Lail, Florida Institute of Technology (United States)

Published in SPIE Proceedings Vol. 10980:
Image Sensing Technologies: Materials, Devices, Systems, and Applications VI
Nibir K. Dhar; Achyut K. Dutta; Sachidananda R. Babu, Editor(s)

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