Resonant absorption and scattering suppression of localized surface plasmons in Ag particles on green LED.
Opt Express
; 21(10): 12100-10, 2013 May 20.
Article
em En
| MEDLINE
| ID: mdl-23736430
ABSTRACT
The metallic-structure dependent localized surface plasmons (LSPs) coupling behaviors with InGaN QWs in a green LED epitaxial wafer are investigated by optical transmission, scanning electron microscopy (SEM) and photoluminescence (PL) measurements. Ag nanoparticles (NPs) are formed by thermal annealing Ag layer on the green LED wafer. SEM images show that for higher annealing temperature and/or thicker deposited Ag layer, larger Ag NPs can be produced, leading to the redshift of absorption peaks in the transmission spectra. Time resolved PL (TRPL) measurements indicate when LSP-MQW coupling occurs, PL decay rate is greatly enhanced especially at the resonant wavelength 560 nm. However, the PL intensity is suppressed by 3.5 folds compared to the bare LED. The resonant absorption and PL suppression are simulated by three dimension finite-difference-time-domain (FDTD), which suggests that Ag particle with smaller size and lower height lead to the larger dissipation of LSP.
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Semicondutores
/
Prata
/
Iluminação
/
Nanopartículas Metálicas
Idioma:
En
Revista:
Opt Express
Assunto da revista:
OFTALMOLOGIA
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
China