Journal: Scientific Reports

Article Title: Fano resonance assisting plasmonic circular dichroism from nanorice heterodimers for extrinsic chirality

doi: 10.1038/srep16069

Figure Lengend Snippet: ( a ) Scheme illustrating the mechanism of Fano assisting CD with electromagnetic responses. Two plasmonic electric dipoles with different momentum hybrid together. The bonding mode is equivlent to a magnetic dipole and a smaller momentum electric dipole . A tilted incident light will couple the electric and magnetic dipoles together to have a CD effect. The overlap of antibonding mode and bonding mode of the two electric dipoles will cause a Fano resnonce. When the Fano resonance happens, the bonding mode becomes strongest, so cause a strongest magnetic dipole momentum, which will cause a strong CD profile. ( b , c ) Schematic representation of an nanorice heterdimer labeled with structure parameters. ( b ) Top view: The nanorice heterodimer located in the x-y plane, with its normal direction along z axis. ( c ) Side view: CPL illuminated the heterodimer with angle θ. ( d ) CD spectra of the heterodimers with different materials. ( e ) Surface charge density distributions for the three modes of heterodimer with different materials excited by RCP light and marked by colored dots in ( d ). CPL: circularly polarized light.

Article Snippet: The simulations were performed with nanorice dimer structures using FEM (Comsol Multiphysics 4.3a).

Techniques: Labeling, Circular Dichroism

Journal: Scientific Reports

Article Title: Fano resonance assisting plasmonic circular dichroism from nanorice heterodimers for extrinsic chirality

doi: 10.1038/srep16069

Figure Lengend Snippet: Extinction spectra of the heterodimer ( l = 240 nm, d = 60 nm ) with g = 20 nm under oblique incidence θ = π /4 with linearly polarized light. ( a ) Extinction spectra of individual nanorices (blue, Au nanorice; red, Ag nanorice) and the surface charge density distributions for dipole and quadrupole modes of Ag nanorice. ( b ) Extinction spectrum of Au-Ag nanorice heterodimer. ( c ) Surface charge density distributions for hybridized plasmon modes (marked by numeral in ( b )) (top: Au, bottom: Ag). ( d ) Energy-level diagram describing the plasmon hybridization of the Au-Ag heterodimer.

Article Snippet: The simulations were performed with nanorice dimer structures using FEM (Comsol Multiphysics 4.3a).

Techniques: Hybridization

Journal: Scientific Reports

Article Title: Fano resonance assisting plasmonic circular dichroism from nanorice heterodimers for extrinsic chirality

doi: 10.1038/srep16069

Figure Lengend Snippet: ( a – c ) The optical spectra of single Ag nanorices and Au-Ag heterodimers with various size but the same aspect ratio (l/d = 4, g = 10 nm ). ( a ) The extinction spectra of individual Ag nanorices excited by linear polarized light. ( b ) The extinction spectra of Au-Ag heterodimers excited by LCP and RCP light. ( c ) The CD spectra for Au-Ag heterodimers. ( d – f ) The optical spectra of single Ag nanorices and Au-Ag heterodimers with different aspect ratio ( l/d = 3,4,6, g = 10 nm ). ( d ) The extinction spectra of single Ag nanorice excited by linear polarized light. ( e ) The extinction spectra of Au-Ag heterodimers excited by LCP and RCP light. The inset shows the Fano fittings (green lines, ) of the overlapped peaks for different aspect ratio excited with RCP. The q values reflect the asymmetry of the peaks. ( f ) The CD spectra for Au-Ag heterodimers. The dimers are set as ( l ( d )) in the figure.

Article Snippet: The simulations were performed with nanorice dimer structures using FEM (Comsol Multiphysics 4.3a).

Techniques: Circular Dichroism