Abstract
SummaryOptical metasurface as a booming research field has put forward profound progress in optics and photonics. Compared with metallic-based components, which suffer from significant thermal loss and low efficiency, high-index all-dielectric nanostructures can readily combine electric and magnetic Mie resonances together, leading to efficient manipulation of optical properties such as amplitude, phase, polarization, chirality, and anisotropy. These advances have enabled tremendous developments in practical photonic devices that can confine and guide light at the nanoscale. Here we review the recent development of local electromagnetic resonances such as Mie-type scattering, bound states in the continuum, Fano resonances, and anapole resonances in dielectric metasurfaces and summarize the fundamental principles of dielectric resonances. We discuss the recent research frontiers in dielectric metasurfaces including wavefront-shaping, metalenses, multifunctional and computational approaches. We review the strategies and methods to realize the dynamic tuning of dielectric metasurfaces. Finally, we conclude with an outlook on the challenges and prospects of dielectric metasurfaces.
Highlights
Optical metasurfaces, as a two-dimensional counterpart of metamaterials, have garnered much attention in the scientific community due to the versatile capabilities to manipulate electromagnetic (EM) waves within an ultrathin surface (Chen et al, 2016; Genevet et al, 2017; Luo, 2019; Monticone and Alu, 2017; Neshev and Aharonovich, 2018)
In summary, based on the versatile capabilities of dielectric nanostructures to generate abundant highefficiency resonances, dielectric metasurfaces have been demonstrated to be a promising platform for efficient EM waves manipulations
The resonance-based optical components natively possess narrower bandwidth compared with non-resonance-based ones such as diffractive elements, the bandwidth of resonance-based metasurfaces can be significantly broadened by elaborate designs, such as by bringing in multi-band resonances (Aieta et al, 2015) or by imposing specific arrangement of nanostructures (Liu et al, 2017b)
Summary
As a two-dimensional counterpart of metamaterials, have garnered much attention in the scientific community due to the versatile capabilities to manipulate electromagnetic (EM) waves within an ultrathin surface (Chen et al, 2016; Genevet et al, 2017; Luo, 2019; Monticone and Alu , 2017; Neshev and Aharonovich, 2018). Electric dipole (ED) and magnetic dipole (MD) resonances can be generated with surface currents and current loops (Kim et al, 2018; Liu et al, 2015b; Mutlu et al, 2012; Wei et al, 2011) These local resonances can induce changes in different optical dimensions, such as phase and polarization. Dielectric building blocks enables simultaneous manipulation of electric and magnetic multipole resonances with negligible thermal loss in the operating waveband (Devlin et al, 2016; Jahani and Jacob, 2016; Li et al, 2015b; Lin et al, 2014), which makes dielectric component a promising candidate for efficient optical and photonic devices. Compared with traditional optics that mainly relies on optical manipulation by optical path superposition, the abundant resonances enabled by dielectric nanostructures guarantee that the optical fields can be manipulated efficiently in an ultrathin thickness with a high degree of freedom
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