Review on plasmon induced transparency based on metal-dielectric-metal waveguides

Plasmon induced transparency(PIT)in the transparent window provides new insights into the design of optical filters,switches and storage,and integrated optics.The slow light effect makes PIT applicable to both sensors and slow light devices.Besides,PIT can overcome the diffraction limit of light,which makes it possible to manipulate light on a half-wavelength scale and brings good news to the miniaturization of optical devices.In this paper,we first summarize the researches of PIT phenomenon based on metal-dielectric-metal(MDM)waveguide systems and analyze the physical mechanisms of PIT including bright-dark mode interactions and phase-coupling-induced transparency.Then,we review the applications of PIT in optical sensing,optical filtering,optical switching,slow light devices and optical logic devices.At last,we outline important challenges that need to be addressed,provide corresponding solutions and predict important directions for future research in this area.

Analysis and Investigation of Slow Light Based on Plasmonic Induced Transparency in Metal-Dielectric-Metal Ring Resonator in a Waveguide System with Different Geometrical Designs

In this paper we will try to create, propose and analyze structure of a slow light device, based on plasmonic induced transparency in a metal-dielectric-metal based ring resonator. Group index by first design about 37 and second design about 35 earned. The proposed dielectric material is Poly Methyl Meta Acrylate (PMMA) sandwiched by gold metal cladding. Finite Element Method-con- ducted Electromagnetic simulations are employed to evaluate the plasmonic designs for behavior of slow light. The signal and pump wavelength are assumed to be 830 nm and 1550 nm respectively in the systems. The overall length of the plasmonic slow light system is 600 nm. In a wide range of frequency bands, the optical properties of metals can be described with a plasma model. The optical signal can be achieved with the use of surface waves on the boundary between the insulating materials and metals with dimensions smaller than the diffraction limit. The main goal, is estimation of optical characteristics such as bandwidth, the Real and Imaginary parts of refractive index, group velocity and slow down factor in such optical devices. The obtained results and observations, can be useful in basic research and the production of highly integrated plasmonic devices.

Polarization-selective nanogold absorber by twisted stacking

Metamaterial absorbers show great promise for applications in optical manipulation,photodetection,solar energy harvesting,and photocatalysis.In this work,we present a twisted stacked metamaterial design that serves as a plasmonic perfect absorber with polarization selectivity.Leveraging effective energy localization,the metamaterial realizes a near-unity absorbance of up to 99.6%for right circularly polarized incidence and 97.2%for left circularly polarized incidence.At a longer wavelength in the visible range,the chiral metamaterial becomes more sensitive to the polarization state of the incident wave,retaining an ultrahigh absorption of light(~94%)for only a given polarization state,that is,light in this polarization state is effectively shielded.A giant circular dichroism signal of up to 7°can be simultaneously observed.Electromagnetic field and charge distribution simulations further reveal that the ultrahigh performance of the design is attributed to the interplay between cavity coupling,magnetic resonances,and plasmonic coupling.Besides switchable and tunable chirality,the plasmonic metamaterial presents a nearperfect absorption band with tunable operational wavelengths.We envision that the high-performance chiral gold metamaterial proposed here can serve as a good candidate for light trapping,chirality sensing,polarized light detection,and polarizationenhanced photocatalysis.