Shaping the fluorescence emission by cavity plasmons in dielectric-metal core-shell resonators

Abstract

We observe experimentally the spectral and spatial reshaping of fluorescence emission in dye-doped dielectric-metal core-shell resonators that support multipolar electric and magnetic-based cavity plasmon resonances. By comparing the experimental fluorescence spectra with analytical calculations based on Mie theory, we are able to demonstrate that the strong reshaping effects are the results of the coupling of dye molecules to those narrow-band cavity plasmon resonances. In addition, we show that the polarization of the fluorescence emission can also be modified by selectively coupling the molecules to the magnetic or electric based cavity plasmons.

Elucidating Molecule–Plasmon Interactions in Nanocavities with 2 nm Spatial Resolution and at the Single‐Molecule Level

“…More interestingly,t he fluorescence emission spectra from molecules embedded at various positions also show slight Stokes shifts from 658 nm to 663 nm (see Figure S6). This phenomenon has been observed previously and is understood by three main mechanisms.First, the fluorescence emission can be reshaped by the nanocavities,k nown as the plasmon-reshaping effect; [16] second, molecular aggregation leads to inhomogeneous broadening of fluorescence signals; [17] third, variations of the local EM environment result in the shifts of the peaks. [18] Regarding the work herein, since the probed molecules are coupled with the same nanocavities,the first mechanism can be safely excluded.…”

Shaping the photoluminescence from gold nanoshells by cavity plasmons in dielectric-metal core-shell resonators

“…Therefore, even though the DMCSRs are closely packed like in this study, the cavity plasmons are allowed to be analyzed using Mie theory, which has already been proven correct in our previous experimental work 25 and also has been employed to analyze the cavity plasmon induced spectral reshaping of fluorescence emission of dye molecules. 27 One of the main advantages of the analytical Mie solution is its ability to decompose the obtained spectra into separate multipolar contributions, characterized by electric TM(l, m) and magnetic TE(l, m) scattering coefficients, where l is the index of angular momentum and m is the order of the mode. 28 Fig.…”

High-Q and Intense Lattice Plasmon Resonance in Hexagonal Nonclose Packed Thin Silver Nanoshells Array

“…In addition, a simple noble metallic (Au/Ag) nanoshell composed of a dielectric nanosphere core and a metallic shell is also demonstrated both theoretically and experimentally to be capable of supporting high- Q cavity plasmon mode (CPM) on the order of ∼200, , which has been designed for low-threshold nanolaser, high-performance biosensor, fluorescent shaper, and plasmonic ruler . However, there exists a trade-off between the Q -factor and the resonance intensity of the CPM in a single metallic nanoshell.…”