Plasmon-Exciton Resonant Energy Transfer: Across Scales Hybrid Systems

Abstract

The presence of an excitonic element in close proximity of a plasmonic nanostructure, under certain conditions, may lead to a nonradiative resonant energy transfer known as Exciton Plasmon Resonant Energy Transfer (EPRET) process. The exciton-plasmon coupling and dynamics have been intensely studied in the last decade; still many relevant aspects need more in-depth studies. Understanding such phenomenon is not only important from fundamental viewpoint, but also essential to unlock many promising applications. In this review we investigate the plasmon-exciton resonant energy transfer in different hybrid systems at the nano- and mesoscales, in order to gain further understanding of such processes across scales and pave the way towards active plasmonic devices.

Plasmon‐Enhanced Fluorescence Resonance Energy Transfer

“…Record that the EPRET is observed evidently by the comparison between fluorescence decay time results off dye‐doped nanoshells and that of doped RhB in SiO 2 beads (Figure ) . The pump‐probe setup (Figure (a)) can measure the normalized transmission difference for different pump power.…”

“…The pump‐probe setup (Figure (a)) can measure the normalized transmission difference for different pump power. Apparently, more dye molecules are inactivated as the increasing of pump power, and in the range of 530–610 nm, the system's absorbance is enhanced and it decreases in the 630–750 nm range (see Figure (b)), while the scattering always remains unchanged . Above that, it is promising for optical tuning of the plasmonic properties in the mesoscale …”

“…used mesocapsules and gold nanoshells to study the PE‐FRET in mesoscale, in which the mesocapsules are formed by plasma nanoparticles embedded in porous silica shell with a radius of 800 nm in R6G dye‐doped solution. (see Figure ), and the gold nanoshell consists of a SiO 2 dielectric core (170 nm) and is blanketed with a flimsy gold shell doped with RhB dye molecules with a thickness of 20 nm . It should be noted that gold nanoshells can be considered in the mesoscale despite the name is origin from the nanoscale shell thickness, because Au nanoshells consist of spherical particles with diameters that can reach up to 250 nm and are made up of dielectric core blanketed with a flimsy gold shell …”

“…Note that the right NP to dye concentration plays an important role in ensuring the occurrence and strength of Exciton Plasmon Resonant Energy Transfer (EPRET) (Figure (a)), and the strong nonradiative EPRET indeed occur because the dye molecules emission does not increase as the increasing of free dye molecules (Figure (b)) . What's more, it is important to positioning the geometry of plasmonic structures, because the dye molecule dipoles can minimize their energy when they reoriented themselves due to the homogeneity of the electric field, and which can enhance the net dipole moment of the gain molecules …”

Tunable Black Gold: Controlling the Near‐Field Coupling of Immobilized Au Nanoparticles Embedded in Mesoporous Silica Capsules

“…[18,23,24] Coupling surface plasmons of two NPs resonant at a given frequency results in bonding (in-phase) modes that occur at lower frequency and antibonding (out-of-phase) modes that occur at a higher frequency. [18,23,24] Coupling surface plasmons of two NPs resonant at a given frequency results in bonding (in-phase) modes that occur at lower frequency and antibonding (out-of-phase) modes that occur at a higher frequency.…”