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(a) Schematic representation of a 3D PAA surface with dimensional parameters D, G1, G2, and G3, where D is the island diameter and G1, G2, and G3 are the ortho-, meta-, and paraisland gap, respectively. (b) A typical 3D AFM image of the silver nanocap/PAA surface. (c) Comparison of PL spectra of the MEH-PPV coupled silver nanoantennae and MEH-PPV coupled PAA membrane. (d) Normalized UV-visible absorption spectra of the MEH-PPV and silver nanoantennae.
A series of SEM images acquired from the silver coated PAA membranes formed under different constant dc voltages: (a) 20 V, (b) 30 V, (c) 40 V, (d) 50 V, and (e) 60 V, respectively. Scale bar: 100 nm. The sputtering times of silver are all set to be 10 min. (f) PL spectra of MEH-PPV coupled silver nanoantennaes formed under different constant dc voltages [samples (a), (b), (c), (d), and (e) in Fig. 2]. The dependence of the PL enhancement ratio of MEH-PPV coupled silver nanoantennaes to MEH-PPV coupled PAA membrane is shown in the inset.
Simulated EM-field distribution maps of the silver nanoantennae arrays with different parameters. (a) , (b) , and (c) . The inset in (a) shows the k-vector and polarization of the incident light in the simulation.
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