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2016 ; 6
(ä): 33208
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Emission wavelength tuning of fluorescence by fine structural control of optical
metamaterials with Fano resonance
#MMPMID27622503
Moritake Y
; Kanamori Y
; Hane K
Sci Rep
2016[Sep]; 6
(ä): 33208
PMID27622503
show ga
We demonstrated fine emission wavelength tuning of quantum dot (QD) fluorescence
by fine structural control of optical metamaterials with Fano resonance. An
asymmetric-double-bar (ADB), which was composed of only two bars with slightly
different bar lengths, was used to obtain Fano resonance in the optical region.
By changing the short bar length of ADB structures with high dimensional accuracy
in the order of 10?nm, resonant wavelengths of Fano resonance were controlled
from 1296 to 1416?nm. Fluorescence of QDs embedded in a polymer layer on ADB
metamaterials were modified due to coupling to Fano resonance and fine tuning
from 1350 to 1376?nm was observed. Wavelength tuning of modified fluorescence was
reproduced by analysis using absorption peaks of Fano resonance. Tuning range of
modified fluorescence became narrow, which was interpreted by a simple Gaussian
model and resulted from comparable FWHM in QD fluorescence and Fano resonant
peaks. The results will help the design and fabrication of metamaterial devices
with fluorophores such as light sources and biomarkers.