Plasmonic Photoluminescence Phenomena in Nanostructured Materials

Plasmonic photoluminescence arises when the collective oscillations of electrons in metallic nanostructures decay radiatively, yielding light emission that is both spectrally rich and sensitive to nanoscale geometry. In these materials, interband transitions and intraband hot-carrier recombination pathways combine with localised surface plasmon resonances to produce emission whose intensity, wavelength and temporal dynamics can be tailored through nanoparticle shape, size and arrangement. Quantum-mechanical confinement in ultrathin films or narrow junctions further modulates the density of electronic states, introducing non-thermal carrier distributions and discrete electronic levels. As a result, plasmonic photoluminescence has emerged as a versatile probe of hot-carrier dynamics, atomic-scale fluctuations and field enhancements, with applications spanning optical sensing, background-free spectroscopy, temperature mapping at the nanoscale and new schemes for light conversion in photonic devices.

Research from Nature Portfolio

Recent studies of gap-mode resonators with precisely defined nanometre gaps demonstrate that photoluminescence can be dominated by non-thermal hot-electron populations. Confinement-induced large-momentum absorption drives emission that deviates strongly from equilibrium Fermi-Dirac statistics, opening routes to nonequilibrium light conversion at the nanoscale. Work on plasmonic nanojunctions has revealed intrinsic luminescence blinking linked to light-driven atomic rearrangements within gold cavities. Spectral fluctuations correlate with adatom formation and domain boundary motion, establishing photoluminescence as a real-time probe of atomic-scale dynamics in metal nanocavities. Investigations of ion-implanted noble-metal nanoclusters in dielectric hosts show superlinear emission under ultrafast excitation. The dependence of emission energy on cluster size and composition follows a quantum-size scaling, and bright visible luminescence persists under intense pulsed irradiation, suggesting robust platforms for ultrafast photonic switching and high-contrast imaging.

Plasmonic Photoluminescence Phenomena in Nanostructured Materials publication trend

The graph below shows the total number of articles in plasmonic photoluminescence phenomena in nanostructured materials across all publications each year (not limited to Nature Index journals).

Technical terms

Localized surface plasmon resonance (LSPR): Collective oscillation of conduction electrons in metallic nanostructures induced by light at resonance frequency.

Photoluminescence (PL): Radiative emission following electronic excitation and recombination in a material.

Hot electrons: Charge carriers in a metal with elevated energies above the Fermi level produced upon plasmon decay.

Gap-mode resonator: Nanostructure with a narrow gap that confines electromagnetic fields and supports strongly localised plasmon modes.

Greybody radiation: Emission from a material that deviates from an ideal blackbody spectrum due to wavelength-dependent emissivity in plasmonic systems.

References

1. Quantum-mechanical effects in photoluminescence from thin crystalline gold films. Light: Science & Applications (2024).
2. Non-thermal emission in gap-mode plasmon photoluminescence. Nature Communications (2024).
3. Metallic photoluminescence of plasmonic nanoparticles in both weak and strong excitation regimes. Nanophotonics (2024).
4. Plasmon-modulated photoluminescence from gold nanostructures and its dependence on plasmon resonance, excitation energy, and band structure. Optics Express (2015).
5. Intrinsic luminescence blinking from plasmonic nanojunctions. Nature Communications (2021).
6. Superlinear Photoluminescence by Ultrafast Laser Pulses in Dielectric Matrices with Metal Nanoclusters. Scientific Reports (2019).