Surface Plasmon Polariton Phenomena in Graphene-Based Metamaterials

Surface plasmon polaritons (SPPs) in graphene-based metamaterials represent a frontier in photonics and electromagnetic wave manipulation. These excitations arise from the coupling of collective charge oscillations in graphene with electromagnetic fields at the interface of engineered layered structures. Graphene’s atomically thin profile, high carrier mobility and electrically tunable conductivity enable SPP modes with deep sub-wavelength confinement and adjustable dispersion characteristics across terahertz to mid-infrared frequencies. By assembling graphene with dielectric or polar substrates—such as hexagonal boron nitride (hBN) or lithium fluoride (LiF)—researchers have crafted hyperbolic metamaterials and hybrid heterostructures that support novel plasmon–phonon–polariton modes, perfect absorption over narrow bands, negative refraction and enhanced field localisation. These phenomena offer pathways towards compact sensors, tunable filters and on-chip optical components with unparalleled modulation speed and spectral selectivity.

Research from Nature Portfolio

Recent studies have demonstrated near-perfect, polarisation-insensitive absorption in graphene–hBN hyper-structures at infrared frequencies. By exploiting interferenceless design principles, these layered systems achieve minimal reflectance across a range of incidence angles, with spectral tuning enabled via hBN thickness and graphene chemical potential. Separate work on chiral-graphene–metal interfaces has revealed that both chirality and carrier density govern the dispersion of hybrid SPP modes, allowing dynamic control of resonance frequencies and propagation bandgaps for terahertz sensing applications. Further advances have emerged from graphene–LiF heterostructures, where strong plasmon–phonon hybridisation in the far-infrared region yields backward- or forward-propagating surface modes with a threefold enhancement in figure of merit, tunable via chemical potential adjustments.

Surface Plasmon Polariton Phenomena in Graphene-Based Metamaterials publication trend

The graph below shows the total number of articles in surface plasmon polariton phenomena in graphene-based metamaterials across all publications each year (not limited to Nature Index journals).

Technical terms

Surface plasmon polariton (SPP): A coupled excitation of free charges and photons at a material interface, leading to a confined electromagnetic wave.

Hyperbolic metamaterial: An artificially structured medium whose anisotropic permittivity tensor exhibits components of opposite sign, enabling high-k mode propagation.

Chemical potential (in graphene): A parameter controlling carrier concentration and conductivity via electrostatic gating.

Reststrahlen band: A spectral region in polar dielectrics where strong phonon resonances cause negative permittivity.

Hybridisation: The interaction of distinct polaritonic modes (e.g., plasmon and phonon) to form mixed excitations with tailored dispersion.

References

1. Polarization-insensitive perfect absorption in van der waals hyper-structure. Scientific Reports (2024).
2. Hybrid Surface Plasmon Polariton Wave Generation and Modulation by Chiral-Graphene-Metal (CGM) Structure. Scientific Reports (2018).
3. Tailoring far-infrared surface plasmon polaritons of a single-layer graphene using plasmon-phonon hybridization in graphene-LiF heterostructures. Scientific Reports (2018).
4. Turnable perfect absorption at infrared frequencies by a Graphene-hBN Hyper Crystal.. Optics Express (2016).
5. Tunable surface waves at the interface separating different graphene-dielectric composite hyperbolic metamaterials.. Optics Express (2017).
6. Tunable, omnidirectional, and nearly perfect resonant absorptions by a graphene-hBN-based hole array metamaterial.. Optics Express (2018).
7. Negative Refraction with Superior Transmission in Graphene-Hexagonal Boron Nitride (hBN) Multilayer Hyper Crystal. Scientific Reports (2016).