The recent review [Phys. Rev. Appl. 18, 027001 (2022)] has considered that the existing schemes of nonreciprocal radiation are greatly limited by narrow-operated bandwidth and small angular range. To address these key challenges, here, wide-angle broadband based on cascaded dielectric Weyl semimetal (WS) grating atop a thick continuous metal film is investigated. It shown strong with nonreciprocity larger than 0.9 achieved in spectral range 14.77–16.175 μm for angle 59°. physical origin...

A metamaterial perfect absorber composed of a black phosphorus (BP) monolayer, photonic crystal, and metallic mirror is designed investigated to enhance light absorption at terahertz frequencies. Numerical results reveal that the enhanced greatly with narrow spectra due critical coupling, which enabled by guided resonances. Intriguingly, structure manifests unusual polarization-dependent feature attributable anisotropy phosphorus. The quality factor can be as high 95.1 for one polarization...

Optical switches based on dielectric nanostructures are highly desired at present. To enhance the wavelength-selective light absorption, and achieve an absorption-induced switching effect, here we propose a graphene-based metamaterial absorber that consists of grating, graphene monolayer, photonic crystal. Numerical results reveal dual-band absorption with ultranarrow spectrum system is enhanced greatly due to critical coupling, which enabled by combined effects guided mode resonances band...

Abstract Digital coding metasurface, which provides a new approach to link the physical world and information science, has been quickly developed in recent years. However, all previously reported metasurfaces cannot achieve independent controls of different polarizations both transmission reflection spaces at same time. In this work, reconfigurable anisotropic digital metasurface loaded with electronically controlled PIN diodes is proposed that can independently manipulate not only...

A nonreciprocal thermal emitter, which consists of a magnetic Weyl semimetal embedded in topological photonic crystal, is proposed and investigated. An emitter exhibits strong radiation, results from the exaction state between two crystals (PhCs). The underlying physical mechanism such behaviors disclosed by illustrating field intensity distributions at resonances further confirmed investigating band diagram Zak phases PhCs. Aside that, radiation properties remain excellent within wide...

Overcoming Kirchhoff's laws to achieve strong nonreciprocity enhances energy harvesting and thermal management. Current magneto-optical (MO) strategies need high magnetic excitation large incident angles, hindering practicality. We designed a graphene-InAs hybrid for significant between absorptivity emissivity at small angles with just 0.16 T, showing practical potential. By tuning graphene's Fermi energy, strength can be adjusted via resonance mode competition. This design offers new...

The ability to break the reciprocity between absorbance and emittance provides new ideas develop advanced light harvesting devices thermal management. However, existing designs with magnetic optical (MO) materials typically require a excitation on order of 1 T, which imposes constraint their practical application. Here, photonic structure dielectric-MO material planar sandwiched dielectric resonator array metallic reflector is designed studied. results show that near-perfect nonreciprocity...

A hybrid Tamm plasmonic system is proposed to investigate light manipulation at near-infrared frequency. The numerical results reveal that two remarkable absorption peaks are generated due the different types of resonant modes excited in structure, which can be well explained theoretically by guided-mode resonance (GMR) and plasmon polaritons. It found electromagnetic energy easily trapped parts structure. More importantly, strong interaction between achieved adjusting structure period or...

We propose dynamically tunable dual-band perfect absorption of light in a composite structure, which consists graphene ribbon array coated on dielectric layer, silicon carbide (SiC) film and distributed Bragg reflector (DBR). Two peaks reaching 98.8% at 10.87 μm 97.5% 12.4 µm are observed the hybrid structure. The enhancement can be explained by two different mechanisms: one is attributed to localized surface plasmons (GLSP), other originated from excitation Tamm plasmon polaritons (TPP)...

A double-layer graphene hybrid system is proposed to investigate the multimode coupling at far-infrared frequencies. With assistance of metallic grating, upper- and lower-layer surface plasmons as well magnetic polaritons can be excited simultaneously, resulting in selective localization electromagnetic energy. By tuning thickness spacer, mutual conversion between strong weak achieved, giving rise modes Rabi splitting. The dynamic control also investigated via varying Fermi energy graphene....

The giant enhancement of multi-band nonreciprocal radiation based on the Weyl semimetal-dielectric spacer-Thue-Morse multilayer-metallic mirror structure, is investigated. As an illustration, a novel dual-band thermal emitter proposed scheme designed and studied. results show that two pairs nonoverlapping absorptivity emissivity spectra could be realized, which in realization strong radiation. physical origin behind this phenomenon revealed by amplitude distribution magnetic field confirmed...

We propose a black phosphorus-spacer-metallic grating hybrid system to investigate the strong coupling between phosphorus surface plasmons (BPSP) and magnetic (MP) at far-infrared frequencies. theoretically numerically illustrate interactions BPSP mode MP in regime, which leads prominent Rabi splitting formation of multiple modes. Since mechanisms two resonance modes are completely different, fields can be selectively localized spacer layer or metallic slits by regulating such Due...

Abstract The integration of different functionalities into a real‐time reconfigurable metasurface can give it more powerful ability in manipulation electromagnetic (EM) waves. Here, reflection–transmission (R‐T) digital coding metasurface, which be flexibly switched between the reflection and transmission working states with completely functions, is proposed demonstrated. As proof concept, an R‐T integrated functions EM diffusion state encryption holography designed results have been...

A novel scheme for achieving multichannel nonreciprocal thermal radiation, which is in the form of a photonic crystal heterostructure sandwiched between two symmetric dielectric spacers and Weyl semimetal film backed with metal film, proposed studied. dual-channel emitter first designed studied as an illustration. It found that near-perfect radiations are realized at different wavelengths same time. The underlying physical origin this phenomenon disclosed by investigating magnetic field...

Strong coupling at the subwavelength scale has attracted extensive attention due to interesting physical phenomena brought about by enhanced light-matter interaction. Here we propose a borophene-based hybrid plasmonic structure, which facilitates strong between borophene surface plasmon (BSP) and magnetic polariton (MP) modes. The dispersive propagating BSPs can strongly interact with nondispersive localized MPs tuning electron density, resulting in two bands featuring remarkable Rabi...

Nonreciprocal radiation, violating Kirchhoff's law, has sparked significant interest due to its potential in energy conversion and capture technologies. In this paper, we introduce a hybrid structure combining graphene Weyl semimetal achieve tunable dual-channel nonreciprocal radiation through guided mode resonances. This overcomes the limitations of traditional single-channel systems by offering enhanced efficiency, increased flexibility. The exhibits excellent wide-angle characteristics....

We theoretically and numerically investigate the ligh-matter interaction in a classic topological photonic crystal (PhC) heterostructure, which consists of two opposite-facing 4-period PhCs spaced by dielectric layer. Due to excitation edge mode (TEM) at interface PhCs, strong coupling between incident light TEM produces high quality resonance peak, can be applied many optical devices. As refractive index sensor, it achieves sensitivity 254.5 nm/RIU figure merit (> 250), is superior...