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Surface plasmon-enhanced photoluminescence of DCJTB by using silver nanoparticle arrays

Hsiang-Lin Huang, Chen Feng Chou, Shi Hua Shiao, Yi-Cheng Liu, Jian-Jang Huang, Shien Uang Jen, and Hai-Pang Chiang

Open Access Open Access

Abstract

It is demonstrated that photoluminescence of DCJTB can be enhanced by surface plasmons occurred in silver nanoparticle arrays on glass substrates fabricated by using nanosphere lithography (NSL) combined with reactive ion etching (RIE). By changing the size of the seed polystyrene nanosphere with fixed thickness of SiO2 film as a buffer layer between silver nanoparticles and fluorescent dye, we systematically studied the interaction between surface plasmons in Ag nanostructures and fluorescent dye by measuring the photoluminescence and time-resolved photoluminescence (TRPL) of the samples. As compared with pure DCJTB, it is observed that PL enhancement as high as 9.4 times and life time shortening from 0.966 ns shortened to 0.63 ns can be achieved with polystyrene nanosphere 430nm in diameter. The physical origin due to plasmonic excitation has been clarified from 3D finite element simulations, as well as the assistance of UV-visible reflectance spectrum.

© 2013 Optical Society of America

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Figures (6)
Fig. 1
Fig. 1 Schematic picture of the device fabricated by using NSL.

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Fig. 2
Fig. 2 SEM image.

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Fig. 3
Fig. 3 (a) Absorption spectra of pure DCJTB and the substrate of silver nanoparticle array with nanosphere 430nm, 500nm and 600nm in diameter, respectively. (b) PL spectra of pure DCJTB on the glass and DCJTB on the substrate of silver nanoparticle array with nanosphere 430nm, 500nm and 600nm in diameter, respectively..

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Fig. 4
Fig. 4 TRPL spectra of pure DCJTB on the glass and DCJTB on the substrate of silver nanoparticle array with nanosphere 430nm, 500nm and 600nm in diameter, respectively.

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Fig. 5
Fig. 5 Field enhancement factor on the substrate of silver nanoparticle array with nanosphere 430nm, 500nm and 600nm in diameter, respectively, at 20 nm from the apex of neighbor nanoparticles with incident light at the wavelength of 500 nm.

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Fig. 6
Fig. 6 (a) Normalized total decay rate of an oscillating dipole in the vicinity of a metal sphere as a function of the radius of the sphere. The dipole is oscillating along the radial direction at a distance of 20 nm from the silver sphere. (b) Same condition as (a), but for the quantum yield.

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Equations (2)

Equations on this page are rendered with MathJax. Learn more.

γ F = | E E 0 | 2 ( γ r γ r + γ nr ),
Y= γ r γ r + γ nr ,
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