https://doi.org/10.1016/j.revip.2022.100076

A brief review of topological photonics in one, two, and three dimensions

The sixth-generation (6G) communication technology is being developed in full swing and is expected to be faster and better than the fifth generation. The precise information transfer directivity and the concentration of signal strength are the key topics of 6G technology. We report the synthetic phase design of rotary doublet Airy beam and triplet Gaussian beam varifocal meta-devices to fully control the terahertz beam’s propagation direction and coverage area. The focusing spot can be delivered to arbitrary positions in a two-dimensional plane or a three-dimensional space. The highly concentrated signal can be delivered to a specific position, and the transmission direction can be adjusted freely to enable secure, flexible, and high-directivity 6G communication systems. This technology avoids the high costs associated with extensive use of active components. 6G communication systems, wireless power transfer, zoom imaging, and remote sensing will benefit from large-scale adoption of such a technology.

https://www.science.org/doi/pdf/10.1126/sciadv.adf8478?download=true

A 6G meta-device for 3D varifocal

Free-standing nanofins or pillar meta-atoms are the most common constituent building blocks in metalenses and metasurfaces in general. Here, we present an alternative metasurface geometry based on high aspect ratio via-holes. We design and characterize metalenses comprising ultradeep via-holes in 5 μm thick free-standing silicon membranes with hole aspect ratios approaching 30:1. These metalenses focus incident infrared light into a diffraction-limited spot. Instead of shaping the metasurface optical phase profile alone, we engineer both transmitted phase and amplitude profiles simultaneously by inverse-designing the lens effective index profile. This approach improves the impedance match between the incident and transmitted waves, thereby increasing the focusing efficiency. The holey platform increases the accessible aspect ratio of optical nanostructures without sacrificing mechanical robustness. The high nanostructure aspect ratio also increases the chromatic group delay range attainable, paving the way for a generation of high aspect ratio ruggedized flat optics, including large-area broadband achromatic metalenses.

A High Aspect Ratio Inverse-Designed Holey Metalens.

/pdf/non-orthogonal-polarization-multiplexed-metasurfaces-for-tri-479q25yuik.pdf

Non-orthogonal polarization multiplexed metasurfaces for tri-channel polychromatic image displays and information encryption

Abstract In the last two decades, metamaterials and metasurfaces have introduced many new electromagnetic (EM) theory concepts and inspired contemporary design methodologies for EM devices and systems. This review focuses on the recent advances in metamaterials (MMs) for simultaneous wireless information and power transmission (SWIPT) technology. In the increasingly complex EM world, digital coding and programmable metamaterials and metasurfaces have enabled commercial opportunities with a broad impact on wireless communications and wireless power transfer. In this review, we first introduce the potential technologies for SWIPT. Then, it is followed by a comprehensive survey of various research efforts on metamaterial-based wireless information transmission (WIT), wireless power transmission (WPT), wireless energy harvesting (WEH) and SWIPT technologies. Finally, it is concluded with perspectives on the rapidly growing SWIPT requirement for 6G. This review is expected to provide researchers with insights into the trend and applications of metamaterial-based SWIPT technologies to stimulate future research in this emerging domain.

/pdf/recent-advances-in-metamaterials-for-simultaneous-wireless-4tvbh3er.pdf

Recent advances in metamaterials for simultaneous wireless information and power transmission

/pdf/achromatic-terahertz-airy-beam-generation-with-dielectric-3hqeopy4x2.pdf

Achromatic terahertz Airy beam generation with dielectric metasurfaces

Floquet topological insulators (FTIs) have been used to study the topological features of a dynamic quantum system within the band structure. However, it is difficult to directly observe the dynamic modulation of band structures in FTIs. Here, we implement the dynamic Su–Schrieffer–Heeger model in periodically curved waveguides to explore new behaviors in FTIs using light field evolutions. Changing the driving frequency produces near-field evolutions of light in the high-frequency curved waveguide array that are equivalent to the behaviors in straight arrays. Furthermore, at modest driving frequencies, the field evolutions in the system show boundary propagation, which are related to topological edge modes. Finally, we believe curved waveguides enable profound possibilities for the further development of Floquet engineering in periodically driven systems, which ranges from condensed matter physics to photonics.

/pdf/floquet-spectrum-and-optical-behaviors-in-dynamic-su-39zhu664e0.pdf

Floquet spectrum and optical behaviors in dynamic Su–Schrieffer–Heeger modeled waveguide array

In quantum mechanics, adiabatic elimination is a standard tool that produces a low-lying reduced Hamiltonian for a relevant subspace of states, incorporating effects of its coupling to states with much higher energy. Suppose this powerful elimination approach is applied to quasi-energy states in periodically-driven systems, a critical question then arises that the violation of the adiabatic condition caused by driven forces challenges such a presence of spectral reduction in the non-equilibrium driven system. Here, both theoretically and experimentally, we newly reported two kinds of driven-induced eliminations universal in topologically-protected Floquet systems. We named them "quasi-adiabatic elimination" and "high-frequency-limited elimination", in terms of different driven frequencies that deny the underlying requirement for the adiabatic condition. Both two non-adiabatic eliminations are observed in our recently developed microwave Floquet simulator, a programmable test platform composed of periodically-bending ultrathin metallic coupled corrugated waveguides. Through the near-field imaging on our simulator, the mechanisms between the adiabatic and driven-induced eliminations are revealed, indicating the ubiquitous spectral decomposition for tailoring and manipulating Floquet states with quasi-energies. Finally, we hope our findings may open up profound and applicable possibilities for further developing Floquet engineering in periodically-driven systems, ranging from condensed matter physics to photonics.

Beyond Adiabatic Elimination in Topological Floquet Engineering

The invention discloses a movable type steel base frame for manufacturing a steel bar framework and a manufacturing method thereof, and relates to the field of bridge engineering construction. The movable type steel base frame comprises a fixing frame, a guide rail, a moving frame and an adjusting frame assembly, wherein the guide rail is arranged on one side of the fixing frame, and the moving frame is arranged on the guide rail and can slide along the guide rail, the adjusting frame assembly comprises a plurality of adjusting frames with different lengths; and one adjusting frame selected from the plurality of adjusting frames is arranged between the fixing frame and the moving frame in a detachable mode, one side of each adjusting frame is connected with the fixing frame, and the otherside of each adjusting frame is connected with the moving frame. According to the movable type steel base frame for manufacturing the steel bar framework and the manufacturing method thereof, the problem that steel base frame of the same type can only manufacture a single-size steel bar framework is solved, the structure is flexible, and the practicability is high.

Movable type steel base frame for manufacturing steel bar framework and manufacturing method thereof

The study of topological photonics was initially inspired by the quantum-optical analogy between the Schrodinger equation for electron wave function and the paraxial Helmholtz equation for light. Here, we reveal a novel phenomenon in topological pumping in arrays of nonparaxial optical waveguides, where the quantum-optical analogy becomes no longer valid. We predict theoretically and demonstrate experimentally an unexpected topological pumping when the injected field transfers from one edge of the waveguide arrays to the other edge in the nonreciprocal fashion. Our finding could pave the way to a new field of nonparaxial topological photonics, and it suggests novel topological effects in optics and photonics driven by nonparaxiality.

Asymmetric topological pumping in nonparaxial photonics.

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