Nonlinear Imaging with All-Dielectric Metasurfaces
Date
2020
Authors
Schlickriede, Christian
Kruk, Sergey
Wang, Lei
Sain, Basudeb
Kivshar, Yuri
Zentgraf, Thomas
Journal Title
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Volume Title
Publisher
American Chemical Society
Abstract
Nonlinear metasurfaces incorporate many of the functionalities of their linear counterparts such as wavefront shaping, but
simultaneously they perform nonlinear optical transformations. This dual functionality leads to a rather unintuitive physical behavior which is still widely unexplored for many photonic applications. The nonlinear processes render some basic principles governing the functionality of linear metasurfaces. Exemplarily, the superposition principle and the geometric optics approximation become not directly applicable to nonlinear metasurfaces. On the other hand, nonlinear metasurfaces
facilitate new phenomena that are not possible in the linear regime. Here, we study the imaging of objects through a dielectric nonlinear metalens. We illuminate objects by infrared light and record their generated images at the visible third-harmonic wavelengths. We revisit the classical lens theory and suggest a generalized Gaussian lens equation for nonlinear imaging, verified both experimentally and analytically. We also demonstrate experimentally higher-order spatial correlations facilitated by the nonlinear metalens, resulting in additional image features.
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Keywords
Metalens, dielectric metasurface, nonlinear imaging, third-harmonic generation, nonlinear Huygens’ principle
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Source
Nano Letters
Type
Journal article
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Open Access
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Creative Commons
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