Resonance modes, cavity field enhancements, and long-range collective photonic effects in periodic bowtie nanostructures.
Opt Express
; 19(20): 19660-7, 2011 Sep 26.
Article
en En
| MEDLINE
| ID: mdl-21996907
The discovery of single-molecule sensitivity via surface-enhanced Raman scattering on resonantly excited noble metal nanoparticles has brought an increasing interest in its applications to the molecule detection and identification. Periodic gold bowtie nanostructures have recently been shown to give a large enhancement factor sufficient for single molecule detection. In this work, we simulate the plasmon resonance for periodic gold bowtie nanostructures. The difference between the dipole and the quadrupole resonances is described by examining the magnitude and phase of electric field, the bound surface charge, and the polarization. The gap size dependence of the field enhancement can be interpreted by considering cavity field enhancement. Also, additional enhancement is obtained through the long-range collective photonic effect when the bowtie array periodicity matches the resonance wavelength.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Dispersión de Radiación
/
Espectrometría Raman
/
Fotones
/
Resonancia por Plasmón de Superficie
/
Nanopartículas del Metal
/
Metales
Tipo de estudio:
Prognostic_studies
Idioma:
En
Revista:
Opt Express
Asunto de la revista:
OFTALMOLOGIA
Año:
2011
Tipo del documento:
Article
País de afiliación:
Taiwán
Pais de publicación:
Estados Unidos