Plasmonic Nanoantenna Designs for Optical Communication

Plasmonic nanoantennas are sub-wavelength structures that exploit the resonant interaction between light and free electrons at metal or doped-semiconductor surfaces to achieve intense local field confinement and efficient radiation. By bridging the gap between photonic waveguides and free-space or on-chip wireless links, these devices offer a promising route to ultra-compact, high-speed optical interconnects. Designs span dipole, bowtie, Vivaldi, Yagi–Uda and hybrid geometries, each tailored for specific operational wavelengths, bandwidths and directivities. Recent advances have focused on integrating nanoantennas with standard silicon-photonics platforms, extending operation into the mid-infrared and telecom bands, and exploiting new materials such as highly doped silicon and III–V semiconductors. Applications include point-to-point on-chip links, optical sensing via vibrational spectroscopy, energy harvesting and components for next-generation wireless-optical networks. Central challenges remain the optimisation of radiation efficiency, minimisation of propagation losses and large-scale manufacturability, all of which are being addressed through theoretical modelling, full-wave simulation and experimental validation.

Research from Nature Portfolio

Recent studies have demonstrated the potential of highly doped silicon nanoantenna designs resonant in the mid-infrared, showing ultra-high local field enhancements within dipole gaps. Numerical analyses reveal that variations in doping concentration and geometry allow tunable resonance peaks for molecule-specific sensing and seamless integration with standard electronic-industry fabrication processes. Complementing this work, a circular hybrid plasmonic waveguide-fed nanoantenna operating at 1 550 nm has been introduced, where an analytically derived dispersion relation is validated by finite-element and finite-difference time-domain methods. This design achieves realised gains above 10 dB, directivities near 10 dBi, a broad low-loss bandwidth and laser-safe operation, while array configurations demonstrate steerable beams and enhanced link performance for on-chip wireless communication.

Plasmonic Nanoantenna Designs for Optical Communication publication trend

The graph below shows the total number of articles in plasmonic nanoantenna designs for optical communication across all publications each year (not limited to Nature Index journals).

Technical terms

Plasmonic nanoantenna: A sub-wavelength metallic or doped-semiconductor structure that converts between propagating optical waves and confined surface plasmon modes.

Localized surface plasmon resonance (LSPR): A resonant oscillation of conduction electrons at a metal–dielectric interface, producing strong local electric-field enhancement.

Hybrid plasmonic waveguide: A waveguide combining dielectric and plasmonic guiding layers to achieve tight optical confinement with reduced propagation loss.

Directivity: A metric quantifying the concentration of radiated power in a specified direction, reflecting an antenna’s beam-focusing ability.

Bandwidth: The range of operating wavelengths or frequencies over which an antenna maintains its performance within defined limits.

References

1. Giant localized electromagnetic field of highly doped silicon plasmonic nanoantennas. Scientific Reports (2023).
2. Theoretical analysis of a circular hybrid plasmonic waveguide to design a hybrid plasmonic nano-antenna. Scientific Reports (2020).
3. Plasmonics for Telecommunications Applications. Sensors (2020).
4. Integrated Vivaldi plasmonic antenna for wireless on-chip optical communications.. Optics Express (2017).
5. Array of plasmonic Vivaldi antennas coupled to silicon waveguides for wireless networks through on-chip optical technology - WiNOT.. Optics Express (2018).