Abstract

In this Letter, we investigated the experimental observation of the specific spatially localized photonic jet array formed by core–shell phase diffraction gratings (PDGs). The core–shell PDG consists of a metallic shell (copper, silver, and gold) and a dielectric core (polydimethylsiloxane) with the hemispherical and triangular grooves. The finite-difference time-domain technique is employed to simulate the near-field scattering of optical radiation at different core–shell PDGs. The direct imaging of a photonic jet array is performed by a scanning optical microscope for experimental verification. Our numerical and experimental results showed that each type of core–shell PDGs generate the photonic jet array with unique properties. The optical intensity of the photonic jet array is greatly enhanced by gold-coating PDG due to surface plasmon resonance. The presented core–shell PDGs can be manipulated to design high-efficiency optical elements for steering the photonic jet array in a wide range of applications.

© 2020 Optical Society of America

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