All‐Dielectric Huygens’ Meta‐Waveguides for Resonant Integrated Photonics

Abstract

The growing maturity of nanofabrication technology has recently enabled the deployment of high-quality subwavelength nanostructures on photonic chips. Combining existing photonic waveguide technology with the paradigms adapted from metamaterials opens new avenues towards unprecedented control of guided light waves. However, developing new functionalities while preserving efficiencies and offering compatibility with current technology remains a major challenge in on-chip nanophotonics. Here, a novel silicon nanophotonic waveguide comprising a chain of resonantly forward scattering nanoparticles empowered by spectrally overlapping electric and magnetic dipolar Mie-type resonances is proposed and demonstrated. The propagation loss of the meta-waveguides in the telecom spectral range is as low as 0.4 dB mm −1 , exceeding the current record for Mie-resonant waveguides by more than an order of magnitude. Furthermore, the meta-waveguides support a negative group index over a broad spectral range of 60 nm and regions of vanishing and anomalous dispersion within the transmission band. Finally, it is shown that meta-waveguide topologies can implement compact resonance-protected waveguide bends and efficient splitters within just 320 nm propagation length. This work addresses the fundamental challenges of miniaturization, dispersion, and scattering control in integrated photonics and opens new opportunities for enhancing light-matter interactions, interfacing nanophotonic components, and developing nonlinear, ultrafast, and quantum optics resonant on-chip devices.

Fast Simulation of Light Scattering and Harmonic Generation in Axially Symmetric Structures in COMSOL

“…In this section, we apply the developed numerical method for modeling second harmonic generation in 1D ordered arrays of AlGaAs nanodisks. Owing to periodic structure, one-dimensional arrays of dielectric resonators demonstrate linear − and nonlinear , waveguide properties provided by the propagating Bloch waves below the light line. The modes are characterized by the quasi-wavevector q which spans from – π/ a to π/ a in the first Brillouin zone and the modes close to the edge of the band q ≈ π/ a are often referred to as band-edge modes.…”

Engineering of High-Q States via Collective Mode Coupling in Chains of Mie Resonators

“…Rather small thickness of the semiconductor layers in commercially available wafers along with restrictions of the industrial fabrication protocols and Mie resonance condition imply the minimal size of the period a ≳ 0.3λ. 32,35,36 ■ RESULTS AND DISCUSSION Chain of Dielectric Cylinders: Numerical Simulations. The proposed mechanism described within the framework of the toy dipole model can be realized in the chain of high-index dielectric resonators with a suitable choice of parameters.…”

Functionalizing nanophotonic structures with 2D van der Waals materials

“…In contrast, metasurfaces are engineered optical scatterer arrays with a subwavelength dimension that can achieve powerful control over the fundamental attributes of light, 22,95,135–144 such as the phase, wave vector, amplitude, and frequency, 145–148 with widespread application such as meta-lenses, 149,150 high-efficiency holograms, 151,152 color display, 21,152–154 ultrathin cloaks, 155–157 healthcare sensors, 158–162 LiDAR, 163–165 functional meta-waveguides, 10,166–180 and nonlinear applications, 181–183 to name a few.…”