Characteristics of surface plasmon polaritons at a chiral–metal interface

Abstract

The characteristics of surface plasmon polaritons at a chiral-metal interface are analyzed in detail. Compared to conventional surface plasmon waves at a dielectric-metal interface, it is shown that chiral surface plasmon waves have distinguishing features such as the presence of an s-wave at the metal surface, the existence of a cutoff frequency and chirality value, and the dependence of the propagation length on the chiral parameter. These properties of chiral surface plasmon waves can be exploited for on-chip chiral sensing and enantiometric detection applications.

Hybrid Surface Plasmon Polariton Wave Generation and Modulation by Chiral-Graphene-Metal (CGM) Structure

“…The chiral material exhibits optical rotation phenomena and supports right circular polarization (RCP) and Left circular polarization (LCP) wave propagation, which means that the Transverse Magnetic (TM) and Transverse Electric (TE) modes cannot be studied independently, which is clear from the constitutive relationships i.e., D = ε E − jξ B and H = − jξ E + B / μ 24,25 . The following phasors that qualify all the characteristics of chiral material are given below; the E z and H z fields components in chiral components can be express as the superposition of the two given modes 28 where and are solutions to the wave equation that satisfy the wave equation when …”

“…While the other associated field components can be derived by using Max well’s equation as reported by Mi & Van 28 where ω is the incident frequency, ε m and μ 0 are the electric permittivity of metal and permeability of the free-space, is the decaying constant, and , and A 1 , A 2 , B 1 and B 2 are unknown constants. To compute the dispersion relationship of the CGM interface, the impedance boundary condition approach is used to physically model the graphene-based interface as in Zhou et al .…”

“…If the graphene monolayer is removed i.e., σ g = 0,then the above dispersion equation transforms into the dispersion relation presented in Mi and Van 28 . The next section presents simulation results for further studying the physical behavior of hybrid surface wave propagating modes.…”

“…Such molecules are modeled as chiral materials and have been the interest of many scientific communities as chiral sensing, chemical or analyte sensing tool and Enantiomer detection 23 .The chiral sculptured thin film-based metal dielectric interface geometry is examined for the optical sensing of an analyte by generating multiple SPP waves and Tamm Waves under different conditions 24–27 . Recently, the isotropic chiral-metal interface has been studied for the propagation of hybrid SPP wave generation for the detection of chiral sensing and enantiomeric detection it is reported that chirality is sensitive to the propagation length 28 . To further enhance the sensitivity, control and modulation of surface waves, the graphene’s dynamical tuning of conductivity, introduces new degrees of freedom to manipulate and control the optical properties of the graphene layer 15 .…”

Control of Surface Plasmon-Polaritons in Magnetoelectric Heterostructures

“…There is a slight difference between the surface plasmon frequencies of the two modes according to Eqs. (23),(24) and(25). For example, for the gold/Cr 2 O 3 interface the surface plasmon frequency corresponds to λ sp e = 506 nm and λ sp o = 503.5 nm while for the silver/Cr 2 O 3 interface λ sp e = 390 nm and λ sp o = 387 nm.…”