Plasmon properties of hybrid metallic ring/disk system

+

-

Ene

rgy

(eV

)

Extinction (a.u.)

D=130nm

d1=200nm d2=150nm Subradiance

enhance the sharpening of the linewidth!

Max: 91

Max: 23 Max: 112

Max:18 Max: 120

J. Aizpurua et al PRL 90, 057401 (2003)

Fabricated in IMEC

F. Hao et al PRB 76, 245417 (2007)

Ext

inct

ion

(a.

u.)

Plasmon Energy (eV)

d1=200nm d2=180nm H=50nm

D=100nm

D=130nm

D=150nm

D=160nm

D=170nm

Wavelength (nm)

Ext

inct

ion

(a.u

.)d1=200nm d2=150nm D=90nm H=50nm

d1=200nm d2=150nm D=120nm H=50nm

d1=200nm d2=180nm D=150nm H=50nm

d1=200nm d2=180nm D=150nm H=25nm

d1=600nm d2=540nm D=450nm H=75nm

Max: 110

Max: 11

k

Eθ

Max: 102

Max: 41

Max: 41Max: 36

θ=90°

Max: 119

Max: 38Max: 24

Max: 21

θ=45°

Wavelength (nm)

Ext

inct

ion

(a.u

.)

θ=0°

Wavelength (nm)

A common substrate for both SERS and SEIRA !

Wavelength (nm)

Ext

inct

ion

(a.u

.)

λ=1398 nmλ=2666 nm

λ=1398 nm

λ=2726 nm λ=2801 nm

λ=1469 nm

Wavelength (nm)

k

E

+

-

Pla

smon

Ene

rgy

(eV

)

Extinction (a.u.)

k

E

k

E

+

-Wavelength (nm)

|α| (

a.u.

)

λ=1398nm λ=1583nm

λ=2726nm |α| from FDTD

|α| fitted by Fano model

Individual resonances in Fano model

Fano model:

k1, γ1 k2, γ2Γ

F1 F2 C.L. Garrido Alzar et al Am. J. Phys. 70 (1), 37-41 (2002)

Bright mode Dark mode

λ=2726nm

λ=768nm

λ=1417nm

λ=937nm

+-

θ=90°

θ=45°

θ=0°

Wavelength (nm)

Ex

tin

cti

on

(a

.u.)

k

Eθ

θ=15°

θ=30°

θ=60°

+

-

θ=90°

θ=45°

θ=0°

k

Eθ `

θ=15°

θ=30°

θ=60°