We propose the monolayer graphene with a periodic stack of dielectric materials to achieve comb-like absorption enhancement. The number peaks corresponds stacked period two materials. simulation and theoretical results illustrate that appearance multiple is attributed excitation waveguide modes confirmed by using theory. perfect at any desired wavelength in visible range can be tuned carefully optimizing structural parameters

Abstract In this work, we present a mid-infrared (mid-IR) thin-film narrowband interference filter operated in transmission mode. The structure is comprised with an air gap symmetrically bounded by thin-film-stack-coated prisms. We utilize the coupled mode theory (CMT) and transfer matrix method (TMM) to theoretically analyze resonant tunneling effect. When corresponding parameter conditions are satisfied, high-performance bandpass can be achieved at incidence angles greater than critical...

A waveguide-coupled surface phonon resonance (SPhR) sensor with super-resolution based on Fano (FR) by using a multilayer system within the Kretschmann configuration in mid-infrared wavelength region is proposed. Due to coherent interference of waveguide and polariton modes, calculated reflectivity spectrum possesses sharp asymmetric FR dips. An ultra-small linewidth formed because coupling, physical features contribute highly efficient nano-sensor for refractive index sensing. The bulk...

One method for enhancement and manipulation of light absorption with monolayer graphene covered on a single-layer guided mode resonant Brewster filter surface is demonstrated. By means the rigorous coupled-wave analysis method, effect geometrical parameters optical response structure investigated. It possible to achieve maximum 60% at angle; dual-band can also be realized when depth grating increased. The situation oblique incidence TM polarization studied as well; property controlled by...

Violation of Kirchhoff's law is fundamental importance to improve the efficiency energy harvesting. However, experimental confirmation breaking balance between emissivity and absorptivity with complex designs are difficult, previous theoretical proposals restricted narrow band nonreciprocal radiation. Here, we offer a lithography-free avenue create structure for realization pronounced nonreciprocity without an external magnetic field. The proposal consists dielectric spacer separating Weyl...

A multiline absorber based on the excitation of guided-mode resonance one-dimensional photonic crystals (1D-PhCs), including a surface graphene monolayer under attenuated-total-reflection configuration, is proposed and demonstrated. By carefully designing structure parameters 1D-PhCs, guided mode can be modulated by periodic distribution refractive index. Our results reveal that critical coupling in periodical PhCs to produces perfect absorption. The number absorption peaks within band...

Abstract Nonreciprocal light propagation in planar structure has become a hot topic because of the pattern-free fabrication process and potentials for exploring heat transfer energy management. An effective strategy incorporated with natural van der Waals material ( α -phase molybdenum trioxide, -MoO 3 ), ultra-thin polar crystal (silicon carbide, SiC) thin film Weyl semimetal interlayer sitting on metal (silver, Ag) substrate is proposed. The emission absorption suggested device explored...

Polaritonic excitation and management in ultra-thin polar crystals has recently received significant attention holds new promise for epsilon-near-zero (ENZ) modes. However, manipulation of the ENZ mode via anisotropic magneto-optic (MO) material remains elusive. Herein, we provide an effective strategy constructing thin film with dependence on Weyl semimetals (WSM). The thermal radiation proposed device is explored electromagnetic (EM) simulations that utilize rigorous coupled-wave analysis...

From the standpoint of thermal radiation, omnidirectional nonreciprocal radiation (NTR) is strongly desired for energy harvesting. Here, we propose theoretically lithographic free emitter made in a dielectric-Weyl semimetal (WSM)-dielectric fashion and terminated by metallic substrate. By engineering structural parameters, surprising result spectrally selective as well (along both polar azimuthal angles) NTR realized. It shown that magnitude sign contrast between emission ( e ) absorption α...

We design an effective light trapping scheme through engineering metallic gratings and one-dimensional dielectric photonic crystals (PhCs) to increase the optical path length of within solar cells. This incorporation can result in broadband absorption enhancement not only for transverse magnetic polarized but also transverse-electric polarization. Even when no plasmonic mode be excited, due high reflection PhCs, active region still enhanced. Rigorous coupled wave analysis results demonstrate...

Electromagnetic (EM) absorbers and emitters have attracted much interest because of their versatile applications. A photonic heterostructure composed silicon carbide (SiC) layer/germanium (Ge) cavity/distributed Bragg reflector (DBR) has been proposed. Selective emission properties investigated through rigorous coupled wave analysis (RCWA) method. The results illustrate that Tamm phonon-polaritons can be excited, the magnetic field is partially centralized at junction Ge cavity SiC film,...

Nonreciprocal thermal radiation (NTR) has attracted much attention because of the great potentials in various aspects ranging from renewable energy, molecular sensing, to circuitry and camouflage. To manipulate magnitude sign nonreciprocity simultaneously, a trilayer fashion Weyl semimetal (WSM)-dielectric-WSM terminated by metallic substrate is proposed. By engineering structural parameters, surprising result spectrally selective as well azimuth-incidence-angle tuned NTR realized. It...

Optical diode-like effect has sparked growing interest in recent years due to its potential applications integrated photonic systems. In this paper, we propose and numerically demonstrate a new type of easy-processing metal/dielectric cylinder composite grating on semi-sphere substrate, which can achieve high-contrast asymmetric transmission unpolarized light for the sum all diffraction modes entire visible region, effectively guide transmitting out substrate. The (ALT) ratio is larger than...

Hybrid phonon polaritons (PhPs) in polar van der Waals (vdW) layered materials are very appealing for the confinement of light at nanoscale and have facilitated various applications. However, manipulation in-plane anisotropic PhPs via external stimuli presents a significant challenge. Here, we offer lithography-free avenue to create structure realization hybridized from <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math...