Abstract
Surface plasmonic systems provide extremely efficient ways to modulate light-matter interaction in photon emission, light harvesting, energy conversion and transferring, etc. Various surface plasmon enhanced luminescent behaviors have been observed and investigated in these systems. But the origin of an avalanche-like photoluminescence, which was firstly reported in 2007 from Au and subsequently from Ag nanowire arrays/monomers, is still not clear. Here we show, based on systematic investigations including the excitation power/time related photoluminescent measurements as well as calculations, that this avalanche-like photoluminescence is in fact a result of surface plasmon assisted thermal radiation. Nearly all of the related observations could be perfectly interpreted with this concept. Our finding is crucial for understanding the surface plasmon mediated thermal and photoemission behaviors in plasmonic structures, which is of great importance in designing functional plasmonic devices.
Highlights
The excitation of surface plasmon resonances (SPR) gives metallic nanostructures excellent optical properties compared to bulky ones, such as surface plasmon resonance enhanced photoluminescence, local field enhanced second- and third-order optical nonlinearities, and surface plasmon enhanced light harvesting and biosensing, et al On the one hand, SPR excitation enhances both the incoming and outgoing electromagnetic fields[12,13]
We systematically investigated the avalanche-like photoluminescence (APL) behavior in a Au NW array from a new point of view that differs from the above ones
The diameter of each NW is limited by the hole size where it was deposited in, the coating layer, which is inferred from energy dispersive X-ray spectroscopy (EDS) analysis to be mainly composed by Na2CO3, makes the NWs to look thicker and straight in the scanning electron microscopy (SEM) images
Summary
Zongwei Ma1, Ying Yu2, Shaoxin Shen[3], Hongwei Dai[1], Linhua Yao[1], Yibo Han[1], Xia Wang[4], Jun-Bo Han1 & Liang Li1. Various surface plasmon enhanced luminescent behaviors have been observed and investigated in these systems. An avalanche-like photoluminescence (APL) with slopes as large as 18.3 was observed in 2007 in coupled Au nanowires (NWs)[19], and subsequently in Ag NW arrays[20], Ag NW monomers[21], and Au nanorod-nanoparticle hybrids[22], respectively. In these works, measurements and calculations showed a typical bi-segmental EPD dependence of the APL intensity (IAPL). We will show that our explanation could lead to a better insight into the light-matter interaction on the nanoscale
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