Chiral Plasmonic Ellipsoids: An Extended Mie–Gans Model

Abstract

Mie–Gans theory optically characterizes ellipsoidal and by extension generally elongated nonchiral metal nanoparticles (MNPs) and is ubiquitous in verifying experimental results and predicting particle behavior. Recently, elongated chiral MNPs have garnered enthusiasm, but a theory to characterize their chiroptical behavior is lacking in the literature. In this Letter, we present an ab initio model for chiral ellipsoidal MNPs to address this shortcoming and demonstrate that it reduces to the general Mie–Gans model under nonchiral conditions, produces results that concur with state-of-the-art numerical simulations, and can accurately replicate recent experimental measurements. Furthermore, to gain physical insights, we analyze factors such as background medium permittivity and particle size that drive the chiroptical activity using two types of plasmonic chiral MNPs. We also demonstrate the utility of our model in metamaterial design. Generic features of our model can be extended to characterize similar elongated chiral MNPs, fueling many other variants of the current model.

Investigating the impact of polarization on surface plasmon polariton characteristics in plasmonic waveguides under periodic driving fields

“…Modifying the conductor's structure, it is possible to customize the properties of plasmons, especially their interactions with light. This opens up exciting possibilities for creating novel photonic devices [20][21][22][23][24]. To advance next-generation communication channels in chip-scale environments, our primary focus should center on the research field of surface plasmon polaritons (SPPs), a key component of plasmonics.…”

Polarization effect on dressed plasmonic waveguides

“…As a result, research related to SPs have enabled many possibilities for modern nanoscale imaging and sensing applications. 1,3,[5][6][7] Since the collective oscillations of metal electrons, SPs always arise with trapped electromagnetic fields on the interface. Based on the field propagation manner, researchers have introduced two distinct modes of surface plasmons: Localized surface plasmons (LSPs) and surface plasmon polaritons (SPPs).…”

Meta-Atom Coupling Induced Chiral Hotspot in Silicon Nitride Staggered Nanorods Meta-Surface

“…Furthermore, in order to simplify the process difficulty, chiral meta-surfaces with single-layered or multilayered two-dimensional (2D) structures are gradually developed including split-rings, , gammadions, ,, L-shapes, twisted stacked crosses, and nanocylinders with anisotropic rectangular lattices . However, most chiral meta-surfaces are made of metal in previous studies − whose inherent Ohmic loss limits the optical efficiency . Hence, dielectric meta-surfaces have gradually become a new research hot topic because of the low absorption loss.…”