Nonlinear imaging with all-dielectric metasurfaces

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 not directly applicable, such as the superposition principle and the geometric optics approximation. 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.

References in corpus (7)

• Multipolar nonlinear nanophotonics
• Nonlinear optics at all-dielectric nanoantennas and metasurfaces
• Nonlinear Metamaterials for Holography
• Metasurface-assisted phase-matching-free second harmonic generation in lithium niobate waveguides
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• Imaging through nonlinear metalens using second harmonic generation
• Silicon metasurfaces for third harmonic geometric phase manipulation and multiplexed holography

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• Enhanced infrared vision by nonlinear up-conversion in nonlocal metasurfaces
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• Third-harmonic light polarization control in magnetically-resonant silicon metasurfaces
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