Abstract
We describe a theoretical study of gradient metasurfaces that – unlike most theoretical designs requiring advanced fabrication techniques – could easily be produced by a simple patterning method, templated microlens lithography (TEMPL). We show here that positional gradients of identical microstructures can lead to a gradient of phase lag across the metasurface. Using a radial gradient in the pitch of a hexagonal array of identical microfabricated resonators, one could thus produce gradient metasurfaces with the ability to focus infrared light. We provide illustrative examples of devices and compare their theoretical capabilities.
Highlights
The manipulation of light at the nanoscale is the focus of the recently blossoming field of optical metamaterials [1,2]
We describe a theoretical study of gradient metasurfaces that – unlike most theoretical designs requiring advanced fabrication techniques – could be produced by a simple patterning method, templated microlens lithography (TEMPL)
We show here that positional gradients of identical microstructures can lead to a gradient of phase lag across the metasurface
Summary
The manipulation of light at the nanoscale is the focus of the recently blossoming field of optical metamaterials [1,2].
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