Abstract
We report experimental investigation of the photoluminescence (PL) generated from the gold nanoshells of the dielectric-metal core-shell resonators (DMCSR) that support multipolar electric and magnetic based cavity plasmon resonances. Significantly enhanced and modulated PL spectrum is observed. By comparing the experimental results with analytical Mie calculations, we are able to demonstrate that the observed reshaping effects are due to the excitations of those narrow-band cavity plasmon resonances. We also present that the variation on the dielectric core size allows for tuning the cavity plasmon resonance wavelengths and thus the peak positions of the PL spectrum.
Highlights
Since the pioneering work of Mooradian in the late 1960s,1 photoluminescence (PL) from gold nanostructures has shown great potential in many fields, such as cell imaging,[2,3,4,5] bio-sensing[6,7] and plasmonic mode mapping,[8,9,10] due to its characteristics of non-bleaching, non-blinking and high-solution imagining
The roughened gold surface has been reported to allow for enhancing the PL intensity,[12] where the PL enhancement is gained from the improvement of both excitation and emission efficiency by enhancing the local electric fields associated with the excitations of the localized surface plasmon resonances (LSPRs)
We demonstrate that the coupling of the excited electron-hole pairs in gold nanoshells to a set of sharp electric and magnetic based Mie cavity plasmon resonances supported by dielectric-metal core-shell resonators (DMCSR) are enabled
Summary
Since the pioneering work of Mooradian in the late 1960s,1 photoluminescence (PL) from gold nanostructures has shown great potential in many fields, such as cell imaging,[2,3,4,5] bio-sensing[6,7] and plasmonic mode mapping,[8,9,10] due to its characteristics of non-bleaching, non-blinking and high-solution imagining. The PL from gold nanostructures has been attributed to the radiative recombination of conduction band electrons below the Fermi energy with d-band holes,[1,11] which is a very inefficient process. A possible way to enhance the PL intensity of gold nanostructures is to utilize the localized surface plasmon resonances (LSPRs). Owing to the strong coupling between the excited electron-hole pairs and the LSPRs, the position and shape of the plasmon-enhanced PL spectra have been demonstrated to be modulated by the LSPRs.[11,14,21,22,23,24] LSPRs supported by those gold nanostructures usually exhibit low quality factors,[7,14,21] and only the reshaped PL spectra with broad linewidths are observed
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