Plasmonic Nanoantennas and Quantum Emission Control

Plasmonic nanoantennas harness resonance of conduction electrons at metal–dielectric interfaces to confine and manipulate light at subwavelength scales. By coupling quantum emitters—such as molecules, quantum dots or colour centres—to these nanostructures, one can tailor spontaneous emission rates, directivity and photon statistics. Control of emitter–antenna interactions rests on engineering near-field enhancements, mode volumes and local density of optical states. Recent advances exploit diverse geometries—rods, cubes, crescents, patches or hybrid dielectric–metallic resonators—to optimise the Purcell effect, suppress non-radiative losses and achieve ultrafast emission. Such devices enable ultrabright single-photon sources, nanoscale sensors and integrated quantum photonic circuits operating at room temperature. The integration of plasmonic elements with dielectric or micro-optical resonators further balances field confinement with efficient outcoupling, offering pathways to emission rates spanning GHz to THz and efficiencies approaching unity. These capabilities underpin emerging applications in quantum information processing, metrology, bio-imaging and on-chip optical communication, marking plasmonic nanoantennas as pivotal components in next-generation quantum photonics.

Research from Nature Portfolio

Experimental studies have demonstrated ultrafast emission by coupling colloidal quantum dots to nanopatch antennas composed of silver nanocubes above a gold film separated by a polymer spacer, achieving spontaneous emission lifetimes below 11 ps and rate enhancements exceeding 880-fold with high radiative efficiency. Controlled positioning of single quantum dots near gold nanocone antennas has yielded monoexciton and biexciton decay-rate enhancements of over 100-fold at quantum efficiencies above 60%. More recently, a U-shaped gold nanocavity has enabled selective far-field excitation and detection of two quantum dot emitters with individual Purcell-enhanced emission rates up to 132-fold, demonstrating addressable multi-emitter control within a single plasmonic device.

Plasmonic Nanoantennas and Quantum Emission Control publication trend

The graph below shows the total number of articles in plasmonic nanoantennas and quantum emission control across all publications each year (not limited to Nature Index journals).

Technical terms

Plasmonic nanoantenna: A metallic nanostructure supporting localized surface plasmon resonances to concentrate optical fields below the diffraction limit.

Purcell effect: Enhancement of spontaneous emission rate of an emitter due to modification of the local photonic density of states by a resonant environment.

Quantum emitter: A system such as a quantum dot or colour centre that emits light via discrete electronic transitions.

Mode volume: A measure of the spatial confinement of an optical mode within a resonator or antenna structure.

Hybrid nanocavity: A composite resonator combining plasmonic and dielectric elements to reconcile strong field confinement with efficient photon outcoupling.

References

1. An overview on plasmon-enhanced photoluminescence via metallic nanoantennas. Nanophotonics (2024).
2. Ultrafast spontaneous emission source using plasmonic nanoantennas. Nature Communications (2015).
3. Strong plasmonic enhancement of biexciton emission: controlled coupling of a single quantum dot to a gold nanocone antenna. Scientific Reports (2017).
4. Selective far-field addressing of coupled quantum dots in a plasmonic nanocavity. Nature Communications (2018).
5. Ultrafast quantum photonics enabled by coupling plasmonic nanocavities to strongly radiative antennas. Optica (2020).
6. Greatly amplified spontaneous emission of colloidal quantum dots mediated by a dielectric-plasmonic hybrid nanoantenna. Nanophotonics (2019).