Surface plasmon resonance (SPR) has been intensively studied and widely employed for light trapping absorption enhancement. In the mid-infrared terahertz (THz) regime, graphene supports tunable SPR via manipulating its Fermi energy enhances light-matter interaction at selected wavelength. Most previous studies have concentrated on enhancement in itself while little attention paid to enhancing other light-absorbing materials with SPR. this work, periodic arrays of rings are proposed introduce...

Graphene has emerged as a promising building block in the modern optics and optoelectronics due to its novel optical electrical properties. In mid-infrared terahertz (THz) regime, graphene behaves like metals supports surface plasmon resonances (SPRs). Moreover, continuously tunable conductivity of enables active SPRs gives rise range applications. However, interaction between metal-based resonant metamaterials not been fully understood. this work, simulation investigation on layer THz...

Abstract Plasmonic nanocavities have proved to confine electromagnetic fields into deep subwavelength volumes, implying their potentials for enhanced optical trapping and sensing of nanoparticles. In this review, the fundamentals performances various plasmonic nanocavity geometries are explored with specific emphasis on detection small molecules single These applications capitalize local field intensity, which in turn depends size nanocavities. Indeed, properly designed structures provide...

In this paper, we propose dynamically tunable plasmon induced transparency (PIT) in a graphene-based nanoribbon waveguide coupled with graphene rectangular resonators structure on sapphire substrate by shifting the Fermi energy level of graphene. Two different methods are employed to obtain PIT effect: one is based direct destructive interference between radiative state and dark state, other indirect coupling through waveguide. Our numerical results reveal that high tunability window can be...

Hyperbolic metamaterials have gained considerable attention in the field of optical biosensing due to their ability support highly sensitive plasmonic modes.

Novel hybrid metal-graphene metamaterials featuring dynamically controllable single, double and multiple plasmon induced transparency (PIT) windows are numerically explored in the terahertz (THz) regime. The designed plasmonic composed of a strip ring with graphene integration generate novel PIT window. Once is divided into pairs asymmetrical arcs, both spectral contrast ratio 100% obtained, where one originates from destructive interference between bright-dark modes, other based on...

Metallic plasmonic nanosensors that are ultra-sensitive, label-free, and operate in real time hold great promise the field of chemical biological research. Conventionally, design these nanostructures has strongly relied on time-consuming electromagnetic simulations iteratively solve Maxwell's equations to scan multi-dimensional parameter space until desired sensing performance is attained. Here, we propose an algorithm based particle swarm optimization (PSO), which combination with a machine...

In this study, we achieve polarization-insensitive triple plasmon-induced transparency (triple-PIT) at terahertz frequencies using a novel graphene metamaterial comprising block, four squares, and strips. The insensitivity of structure to changes in the incident light’s polarization angle is attributed its high symmetry. expressions nth-order coupled mode theory are derived accurately, theoretical predictions closely align with findings numerical finite-difference time-domain simulations for...

In this study, we achieve polarization-insensitive triple plasmon-induced transparency (triple-PIT) at terahertz frequencies using a novel graphene metamaterial comprising block, four squares, and strips. The insensitivity of structure to changes in the incident light’s polarization angle is attributed its high symmetry. expressions nth-order coupled mode theory are derived accurately, theoretical predictions closely align with findings numerical finite-difference time-domain simulations for...

<p dir="ltr">In this study, we achieve polarization-insensitive triple plasmon-induced transparency (triple-PIT) at terahertz frequencies using a novel graphene metamaterial comprising block, four squares, and strips. The insensitivity of structure to changes in the incident light’s polarization angle is attributed its high symmetry. expressions nth-order coupled mode theory are derived accurately, theoretical predictions closely align with findings numerical finite-difference...

We numerically demonstrate a novel monolayer graphene-based perfect absorption multi-layer photonic structure by the mechanism of critical coupling with guided resonance, in which graphene can significantly close to 99% at telecommunication wavelengths. The highly efficient and spectral selectivity be obtained designing structural parameters near infrared ranges. Compared previous works, we achieve complete single-atomic-layer absorber for first time, not only opens up new methods enhancing...

Abstract The classical description of laser field buildup, based on time-averaged photon statistics Class A lasers, rests a statistical mixture coherent and incoherent photons. Here, applying multiple analysis techniques to temporal streams data acquired in the threshold region B mesoscale laser, we conclusively show that new physics is involved transition: lasing buildup controlled by large dynamical spikes, whose number increases as pump raised, evolving into an average field, modulated...

A simple perfect absorption structure is proposed to achieve the high efficiency light of monolayer molybdenum disulfide (MoS 2 ) by critical coupling mechanism guided resonances. The results numerical simulation and theoretical analysis show that in this atomically thin layer can be as 98 . 3% at visible wavelengths, which over 12 times more than a bare MoS In addition, operating wavelength tuned flexibly adjusting radius air hole thickness dielectric layers, great practical significance...

Ultrafast and low-power dynamically tunable single channel multichannel slow light based on plasmon induced transparencies (PITs) in disk resonators coupled to a metal-dielectric-metal (MDM) waveguide system with nonlinear optical Kerr medium is investigated both numerically analytically. A coupled-mode theory (CMT) introduced analyze this structure. Multichannel realized plasmonic structure bright–dark mode coupling mechanism. In order reduce the pump intensity obtain ultrafast response...

The study of hyperbolic metamaterial (HMM) refractive index sensors is an active field plasmonics and nanophotonics. Our provides the basis for development ultrasensitive HMM related to biochemical sensing.

A mode-selective grating reflector based on a hybrid plasmonic waveguide, together with two-to-one coupling structure, is proposed and analyzed. The structure designed to reflect only the fundamental even mode existing in pass through odd at 1550-nm wavelength an extinction ratio of ~16.7 dB. simulated transmission spectra verify our analysis expected features Bragg grating.

An advanced optical design for a low f-number, high resolution, astigmatism-free, and broadband Czerny-Turner spectrometer is proposed. A hemispherical lens added between the entrance slit collimating mirror, which can correct astigmatism increase numerical aperture at same time. The theory method aberration correction are analyzed in detail. example of with f-number as 3 working 350-750 nm has been presented by optimized theory. comparison improved conventional also thoroughly described...

In this letter, all-optical dynamically tunable triple plasmon-induced transparency responses are proposed in an ultracompact plasmonic structure, which comprises dual T-shaped resonators side-coupled to a metal–insulator–metal waveguide the near infrared range. High tunability magnitudes of optical channel 1 and 3 can be achieved, when is filled with nonlinear Kerr material, while that 2 remains same approximately. It also possible realize low-power central wavelengths channels, covered by...

In this study, we propose a high-figure-of-merit (FOM) Fano resonance hybrid metamaterial sensor based on localized surface plasmon (LSPR). After the cone index chip experiment LSPR, innovatively used waveguide mode coupling to form solve problem of inherent peak spectral width LSPR. We obtained structures that meet requirements without increasing process difficulty by varying nanoparticle/waveguide structural design parameters. The simulation results demonstrate ultra-narrow linewidth...