Recent advances in high-contrast metastructures, metasurfaces and photonic crystals

Abstract

In the recent decade, the research field using arrays of high-index-contrast near-wavelength dieletric structures on flat surfaces, known as high-contrast metastructures (HCMs) or metasurfaces, has emerged and expanded rapidly. Although the HCMs and metasurfaces share great similarities in physical structures with photonic crystals (PhCs), i.e. periodic nanostructures, many differences exist in their design, analysis, operation conditions, and applications. In this paper, we provide a generalized theoretical understanding of the two subjects and show their intrinsic connections. We further discuss the simulation and design approaches, categorized by their functionalities and applications. The similarity and differences between HCMs, metasurfaces and PhCs are also discussed. New findings are presented regarding the physical connection between the PhC band structures and the 1D and 2D HCM scattering spectra under transverse and longitudinal tilt incidence. Novel designs using HCMs as holograms, spatial light modulators, and surface plasmonic couplers are discussed. Recent advances on HCMs, metasurfaces and PhCs are reviewed and compared for applications such as broadband mirrors, waveguides, couplers, resonators, and reconfigurable optics.

arXiv comment58 pages, 44 figures, review article

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• Bound states in the continuum in photonic structures
• Tunable light flow control in valley photonic crystal waveguide
• Avoided crossings and bound states in the continuum in low-contrast dielectric gratings
• Optical bistability with bound states in the continuum in dielectric gratings
• Coupled electric and magnetic dipole formulation for planar arrays of dipolar particles: metasurfaces with various electric and/or magnetic meta-atoms per unit cell
• Integrated Metasurfaces on Silicon Photonics for Emission Shaping and Holographic Projection
• Perfectly-reflecting guided-mode-resonant photonic lattices possessing Mie modal memory
• Resonant properties of composite structures consisting of several resonant diffraction gratings
• Grating-based microcavity with independent control of resonance energy and linewidth for non-Hermitian polariton system
• Coupled plasmon wave dynamics beyond anomalous reflection: phase gradient Copper metasurface for visible to the near infrared spectrum
• Porous SiO${}_2$ coated dielectric metasurface with consistent performance independent of environmental conditions
• Tailoring sub-Doppler spectra of thermal atoms with a dielectric optical metasurface chip