Tunable light flow control in valley photonic crystal waveguide

Abstract

The exploration of binary valley degree of freedom in topological photonic systems has inspired many intriguing optical phenomena such as photonic Hall effect, robust delay lines, and perfect out-coupling refraction. In this work, we experimentally demonstrate the tunability of light flow in a valley photonic crystal waveguide. By continuously controlling the phase difference of microwave monopolar antenna array, the flow of light can split into different directions according to the charily of phase vortex, and the splitting ratio varies smoothly from 0.9 to 0.1. Topological valley transport of edge states is also observed at photonic domain wall. Tunable edge state dispersion, i.e., from gapless valley dependent modes to gapped flat bands, is found at the photonic boundary between a valley photonic crystal waveguide and a perfect electric conductor, leading to the tunable frequency bandwidth of high transmission. Our work paves a way to the controllability and dynamic modulations of light flow in topological photonic systems.

arXiv comment16 pages, 4 figures

References in corpus (26)

• Topological Photonics
• Photonic Floquet Topological Insulators
• Chiral Quantum Optics
• Scheme to Achieve Silicon Topological Photonics
• Robust optical delay lines via topological protection
• Acoustic topological insulator and robust one-way sound transport
• Experimental observation of Weyl points
• All-Si Valley-Hall Photonic Topological Insulator
• Deterministic photon-emitter coupling in chiral photonic circuits
• Topologically-protected refraction of robust kink states in valley photonic crystals
• Surface Impedance and Bulk Band Geometric Phases in One-Dimensional Systems
• Visualization of unidirectional optical waveguide using topological photonic crystals made of dielectric material
• Topologically protected acoustic helical edge states and interface states in strongly coupled metamaterial ring lattices
• Synthetic gauge fields and Weyl point in Time-Reversal Invariant Acoustic Systems
• Valley-contrasting orbital angular momentum in photonic valley crystals
• Valley-protected backscattering suppression in silicon photonic graphene
• Topological Photonic Phase in Chiral Hyperbolic Metamaterials
• Two-Dimensionally Confined Topological Edge States in Photonic Crystals
• Topological Phases of Sound and Light
• Valley Topological Phases in Bilayer Sonic Crystals
• Tunable topological phononic crystals
• Recent advances in high-contrast metastructures, metasurfaces and photonic crystals
• Observation of Acoustic Valley Vortex States and Valley-Chirality Locked Beam Splitting
• Measurement of the Zak phase of photonic bands through the interface states of metasurface/photonic crystal
• Scattering-Free Optical Edge States between Heterogeneous Photonic Topological Insulators
• Formation of robust and completely tunable resonant photonic band gaps

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• Gapless Unidirectional Photonic Transport Using All-Dielectric Kagome Lattices
• Designing multi-directional energy-splitters and topological valley supernetworks
• Frequency-dependent topological phases and photonic detouring in valley photonic crystals
• Topologically protected Fano resonance in photonic valley Hall insulators
• Observation of boundary induced chiral anomaly bulk states and their transport properties
• Edge State, Band Topology, and Time Boundary Effect in the Fine-Grained Categorization of Chern Insulators
• Observations of symmetry induced topological mode steering in a reconfigurable elastic plate
• Local orbital-angular-momentum dependent surface states with topological protection
• Polarization-dependent and Valley-protected Lamb Waves in Asymmetric Pillared Phononic Crystals
• Gradient catastrophe of nonlinear photonic valley-Hall edge pulses
• Near- and Far-Field Excitation of Topological Plasmonic Metasurfaces
• Valley-dependent topological edge states in plasma photonic crystals
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